trungnguyencs/leetcode

Solutions to Data Structures & Algorithms coding problems, updated daily

Leetcode

Solutions to Data Structures & Algorithms coding problems, updated daily.

Leetcode profile: https://leetcode.com/gauau/

Year	Solved
All-time	1157
2020 - 2021	427
2022 - 2024	769

Problems

Title	Difficulty	Premium	Last Solved	Solution
1. Two Sum	Easy		2 years ago	0001-two-sum.py
2. Add Two Numbers	Medium		2 years ago	0002-add-two-numbers.py
3. Longest Substring Without Repeating Characters	Medium		2 years ago	0003-longest-substring-without-repeating-characters.py
4. Median of Two Sorted Arrays	Hard		last year	0004-median-of-two-sorted-arrays.py
5. Longest Palindromic Substring	Medium		10 months ago	0005-longest-palindromic-substring.py
6. Zigzag Conversion	Medium		last year	0006-zigzag-conversion.py
7. Reverse Integer	Medium		last year	0007-reverse-integer.py
8. String to Integer (atoi)	Medium
9. Palindrome Number	Easy		2 years ago	0009-palindrome-number.py
10. Regular Expression Matching	Hard
11. Container With Most Water	Medium		2 years ago	0011-container-with-most-water.py
12. Integer to Roman	Medium		2 years ago	0012-integer-to-roman.py
13. Roman to Integer	Easy		2 years ago	0013-roman-to-integer.py
14. Longest Common Prefix	Easy		2 years ago	0014-longest-common-prefix.py
15. 3Sum	Medium
16. 3Sum Closest	Medium
17. Letter Combinations of a Phone Number	Medium		2 years ago	0017-letter-combinations-of-a-phone-number.py
18. 4Sum	Medium
19. Remove Nth Node From End of List	Medium		2 years ago	0019-remove-nth-node-from-end-of-list.py
20. Valid Parentheses	Easy		2 years ago	0020-valid-parentheses.py
21. Merge Two Sorted Lists	Easy		2 years ago	0021-merge-two-sorted-lists.py
22. Generate Parentheses	Medium		2 years ago	0022-generate-parentheses.py
23. Merge k Sorted Lists	Hard		2 years ago	0023-merge-k-sorted-lists.py
24. Swap Nodes in Pairs	Medium		2 years ago	0024-swap-nodes-in-pairs.py
25. Reverse Nodes in k-Group	Hard
26. Remove Duplicates from Sorted Array	Easy		2 years ago	0026-remove-duplicates-from-sorted-array.py
27. Remove Element	Easy		2 years ago	0027-remove-element.py
28. Find the Index of the First Occurrence in a String	Easy		2 years ago	0028-find-the-index-of-the-first-occurrence-in-a-string.py
29. Divide Two Integers	Medium		2 years ago	0029-divide-two-integers.py
31. Next Permutation	Medium		2 years ago	0031-next-permutation.py
32. Longest Valid Parentheses	Hard		2 years ago	0032-longest-valid-parentheses.py
33. Search in Rotated Sorted Array	Medium		last year	0033-search-in-rotated-sorted-array.py
34. Find First and Last Position of Element in Sorted Array	Medium		10 months ago	0034-find-first-and-last-position-of-element-in-sorted-array.py
35. Search Insert Position	Easy		last year	0035-search-insert-position.py
36. Valid Sudoku	Medium		2 years ago	0036-valid-sudoku.py
37. Sudoku Solver	Hard
38. Count and Say	Medium		2 years ago	0038-count-and-say.py
39. Combination Sum	Medium		2 years ago	0039-combination-sum.py
40. Combination Sum II	Medium		4 minutes ago	0040-combination-sum-ii.py
41. First Missing Positive	Hard		5 months ago	0041-first-missing-positive.py
42. Trapping Rain Water	Hard		2 years ago	0042-trapping-rain-water.py
43. Multiply Strings	Medium
44. Wildcard Matching	Hard
45. Jump Game II	Medium		last year	0045-jump-game-ii.py
46. Permutations	Medium		last year	0046-permutations.py
47. Permutations II	Medium		2 years ago	0047-permutations-ii.py
48. Rotate Image	Medium		2 years ago	0048-rotate-image.py
49. Group Anagrams	Medium		2 years ago	0049-group-anagrams.py
50. Pow(x, n)	Medium		2 years ago	0050-powx-n.py
51. N-Queens	Hard		2 years ago	0051-n-queens.py
52. N-Queens II	Hard		2 years ago	0052-n-queens-ii.py
53. Maximum Subarray	Medium		2 years ago	0053-maximum-subarray.py
54. Spiral Matrix	Medium		last year	0054-spiral-matrix.py
55. Jump Game	Medium		2 years ago	0055-jump-game.py
56. Merge Intervals	Medium		last year	0056-merge-intervals.py
57. Insert Interval	Medium		5 months ago	0057-insert-interval.py
58. Length of Last Word	Easy		5 months ago	0058-length-of-last-word.py
59. Spiral Matrix II	Medium		2 years ago	0059-spiral-matrix-ii.py
61. Rotate List	Medium		2 years ago	0061-rotate-list.py
62. Unique Paths	Medium		2 years ago	0062-unique-paths.py
63. Unique Paths II	Medium		last year	0063-unique-paths-ii.py
64. Minimum Path Sum	Medium		last year	0064-minimum-path-sum.py
65. Valid Number	Hard
66. Plus One	Easy
67. Add Binary	Easy
68. Text Justification	Hard
69. Sqrt(x)	Easy
70. Climbing Stairs	Easy		2 years ago	0070-climbing-stairs.py
71. Simplify Path	Medium		2 years ago	0071-simplify-path.py
72. Edit Distance	Hard		last year	0072-edit-distance.py
73. Set Matrix Zeroes	Medium
74. Search a 2D Matrix	Medium		2 years ago	0074-search-a-2d-matrix.py
75. Sort Colors	Medium		last year	0075-sort-colors.py
76. Minimum Window Substring	Hard		2 years ago	0076-minimum-window-substring.py
77. Combinations	Medium		last year	0077-combinations.py
78. Subsets	Medium		3 months ago	0078-subsets.py
79. Word Search	Medium		5 months ago	0079-word-search.py
80. Remove Duplicates from Sorted Array II	Medium		2 years ago	0080-remove-duplicates-from-sorted-array-ii.py
81. Search in Rotated Sorted Array II	Medium		2 years ago	0081-search-in-rotated-sorted-array-ii.py
82. Remove Duplicates from Sorted List II	Medium		2 years ago	0082-remove-duplicates-from-sorted-list-ii.py
83. Remove Duplicates from Sorted List	Easy		last year	0083-remove-duplicates-from-sorted-list.py
86. Partition List	Medium		2 years ago	0086-partition-list.py
88. Merge Sorted Array	Easy		2 years ago	0088-merge-sorted-array.py
89. Gray Code	Medium
90. Subsets II	Medium
91. Decode Ways	Medium		8 months ago	0091-decode-ways.py
92. Reverse Linked List II	Medium		2 years ago	0092-reverse-linked-list-ii.py
93. Restore IP Addresses	Medium		last year	0093-restore-ip-addresses.py
94. Binary Tree Inorder Traversal	Easy		2 years ago	0094-binary-tree-inorder-traversal.py
95. Unique Binary Search Trees II	Medium		last year	0095-unique-binary-search-trees-ii.py
96. Unique Binary Search Trees	Medium
97. Interleaving String	Medium		last year	0097-interleaving-string.py
98. Validate Binary Search Tree	Medium		2 years ago	0098-validate-binary-search-tree.py
99. Recover Binary Search Tree	Medium		2 years ago	0099-recover-binary-search-tree.py
100. Same Tree	Easy		last year	0100-same-tree.py
101. Symmetric Tree	Easy		2 years ago	0101-symmetric-tree.py
102. Binary Tree Level Order Traversal	Medium		2 years ago	0102-binary-tree-level-order-traversal.py
103. Binary Tree Zigzag Level Order Traversal	Medium		last year	0103-binary-tree-zigzag-level-order-traversal.py
104. Maximum Depth of Binary Tree	Easy		last year	0104-maximum-depth-of-binary-tree.py
105. Construct Binary Tree from Preorder and Inorder Traversal	Medium
107. Binary Tree Level Order Traversal II	Medium		last year	0107-binary-tree-level-order-traversal-ii.py
108. Convert Sorted Array to Binary Search Tree	Easy		2 years ago	0108-convert-sorted-array-to-binary-search-tree.py
109. Convert Sorted List to Binary Search Tree	Medium		last year	0109-convert-sorted-list-to-binary-search-tree.py
110. Balanced Binary Tree	Easy		last year	0110-balanced-binary-tree.py
111. Minimum Depth of Binary Tree	Easy		last year	0111-minimum-depth-of-binary-tree.py
112. Path Sum	Easy		2 years ago	0112-path-sum.py
113. Path Sum II	Medium		2 years ago	0113-path-sum-ii.py
114. Flatten Binary Tree to Linked List	Medium		2 years ago	0114-flatten-binary-tree-to-linked-list.py
116. Populating Next Right Pointers in Each Node	Medium		7 months ago	0116-populating-next-right-pointers-in-each-node.py
117. Populating Next Right Pointers in Each Node II	Medium		2 years ago	0117-populating-next-right-pointers-in-each-node-ii.py
118. Pascal's Triangle	Easy		2 years ago	0118-pascals-triangle.py
119. Pascal's Triangle II	Easy		10 months ago	0119-pascals-triangle-ii.py
120. Triangle	Medium
121. Best Time to Buy and Sell Stock	Easy		2 years ago	0121-best-time-to-buy-and-sell-stock.py
122. Best Time to Buy and Sell Stock II	Medium
123. Best Time to Buy and Sell Stock III	Hard
124. Binary Tree Maximum Path Sum	Hard		2 years ago	0124-binary-tree-maximum-path-sum.py
125. Valid Palindrome	Easy		last year	0125-valid-palindrome.py
126. Word Ladder II	Hard
127. Word Ladder	Hard		2 years ago	0127-word-ladder.py
128. Longest Consecutive Sequence	Medium		2 years ago	0128-longest-consecutive-sequence.py
129. Sum Root to Leaf Numbers	Medium		last year	0129-sum-root-to-leaf-numbers.py
130. Surrounded Regions	Medium
131. Palindrome Partitioning	Medium		2 years ago	0131-palindrome-partitioning.py
132. Palindrome Partitioning II	Hard
133. Clone Graph	Medium		2 years ago	0133-clone-graph.py
134. Gas Station	Medium		2 years ago	0134-gas-station.py
135. Candy	Hard		last year	0135-candy.py
136. Single Number	Easy		2 years ago	0136-single-number.py
137. Single Number II	Medium		last year	0137-single-number-ii.py
138. Copy List with Random Pointer	Medium		2 years ago	0138-copy-list-with-random-pointer.py
139. Word Break	Medium		last year	0139-word-break.py
140. Word Break II	Hard		3 months ago	0140-word-break-ii.py
141. Linked List Cycle	Easy		last year	0141-linked-list-cycle.py
142. Linked List Cycle II	Medium
143. Reorder List	Medium		5 months ago	0143-reorder-list.py
144. Binary Tree Preorder Traversal	Easy		2 years ago	0144-binary-tree-preorder-traversal.py
145. Binary Tree Postorder Traversal	Easy		2 years ago	0145-binary-tree-postorder-traversal.py
146. LRU Cache	Medium
147. Insertion Sort List	Medium
148. Sort List	Medium		2 years ago	0148-sort-list.py
149. Max Points on a Line	Hard		2 years ago	0149-max-points-on-a-line.py
150. Evaluate Reverse Polish Notation	Medium		2 years ago	0150-evaluate-reverse-polish-notation.py
151. Reverse Words in a String	Medium		2 years ago	0151-reverse-words-in-a-string.py
152. Maximum Product Subarray	Medium
153. Find Minimum in Rotated Sorted Array	Medium
154. Find Minimum in Rotated Sorted Array II	Hard
155. Min Stack	Medium		2 years ago	0155-min-stack.py
156. Binary Tree Upside Down	Medium	Premium
157. Read N Characters Given Read4	Easy	Premium
158. Read N Characters Given read4 II - Call Multiple Times	Hard	Premium
159. Longest Substring with At Most Two Distinct Characters	Medium	Premium	2 years ago	0159-longest-substring-with-at-most-two-distinct-characters.py
160. Intersection of Two Linked Lists	Easy		2 years ago	0160-intersection-of-two-linked-lists.py
161. One Edit Distance	Medium	Premium	2 years ago	0161-one-edit-distance.py
162. Find Peak Element	Medium
163. Missing Ranges	Easy	Premium	last year	0163-missing-ranges.py
164. Maximum Gap	Hard
165. Compare Version Numbers	Medium		4 months ago	0165-compare-version-numbers.py
166. Fraction to Recurring Decimal	Medium
167. Two Sum II - Input Array Is Sorted	Medium		2 years ago	0167-two-sum-ii-input-array-is-sorted.py
168. Excel Sheet Column Title	Easy		last year	0168-excel-sheet-column-title.py
169. Majority Element	Easy		2 years ago	0169-majority-element.py
170. Two Sum III - Data structure design	Easy	Premium
171. Excel Sheet Column Number	Easy		2 years ago	0171-excel-sheet-column-number.py
172. Factorial Trailing Zeroes	Medium
173. Binary Search Tree Iterator	Medium		2 years ago	0173-binary-search-tree-iterator.py
174. Dungeon Game	Hard
179. Largest Number	Medium
186. Reverse Words in a String II	Medium	Premium
187. Repeated DNA Sequences	Medium
188. Best Time to Buy and Sell Stock IV	Hard
189. Rotate Array	Medium		2 years ago	0189-rotate-array.py
190. Reverse Bits	Easy		last year	0190-reverse-bits.py
191. Number of 1 Bits	Easy		9 months ago	0191-number-of-1-bits.py
198. House Robber	Medium		7 months ago	0198-house-robber.py
199. Binary Tree Right Side View	Medium		last year	0199-binary-tree-right-side-view.py
200. Number of Islands	Medium		2 years ago	0200-number-of-islands.py
201. Bitwise AND of Numbers Range	Medium		6 months ago	0201-bitwise-and-of-numbers-range.py
202. Happy Number	Easy		last year	0202-happy-number.py
203. Remove Linked List Elements	Easy		2 years ago	0203-remove-linked-list-elements.py
204. Count Primes	Medium
205. Isomorphic Strings	Easy		10 months ago	0205-isomorphic-strings.py
206. Reverse Linked List	Easy		10 months ago	0206-reverse-linked-list.py
207. Course Schedule	Medium		last year	0207-course-schedule.py
208. Implement Trie (Prefix Tree)	Medium		last year	0208-implement-trie-prefix-tree.py
209. Minimum Size Subarray Sum	Medium		last year	0209-minimum-size-subarray-sum.py
210. Course Schedule II	Medium
211. Design Add and Search Words Data Structure	Medium		2 years ago	0211-design-add-and-search-words-data-structure.py
212. Word Search II	Hard
213. House Robber II	Medium
214. Shortest Palindrome	Hard
215. Kth Largest Element in an Array	Medium		2 years ago	0215-kth-largest-element-in-an-array.py
216. Combination Sum III	Medium		2 years ago	0216-combination-sum-iii.py
217. Contains Duplicate	Easy		last year	0217-contains-duplicate.py
218. The Skyline Problem	Hard
219. Contains Duplicate II	Easy		2 years ago	0219-contains-duplicate-ii.py
221. Maximal Square	Medium
222. Count Complete Tree Nodes	Medium
223. Rectangle Area	Medium		2 years ago	0223-rectangle-area.py
224. Basic Calculator	Hard
225. Implement Stack using Queues	Easy		last year	0225-implement-stack-using-queues.py
226. Invert Binary Tree	Easy		last year	0226-invert-binary-tree.py
227. Basic Calculator II	Medium		6 months ago	0227-basic-calculator-ii.py
228. Summary Ranges	Easy		2 years ago	0228-summary-ranges.py
229. Majority Element II	Medium		last year	0229-majority-element-ii.py
230. Kth Smallest Element in a BST	Medium
231. Power of Two	Easy		2 years ago	0231-power-of-two.py
232. Implement Queue using Stacks	Easy		2 years ago	0232-implement-queue-using-stacks.py
234. Palindrome Linked List	Easy		7 months ago	0234-palindrome-linked-list.py
235. Lowest Common Ancestor of a Binary Search Tree	Medium		2 years ago	0235-lowest-common-ancestor-of-a-binary-search-tree.py
236. Lowest Common Ancestor of a Binary Tree	Medium		2 years ago	0236-lowest-common-ancestor-of-a-binary-tree.py
237. Delete Node in a Linked List	Medium		2 years ago	0237-delete-node-in-a-linked-list.py
238. Product of Array Except Self	Medium		5 months ago	0238-product-of-array-except-self.py
239. Sliding Window Maximum	Hard		last year	0239-sliding-window-maximum.py
240. Search a 2D Matrix II	Medium
241. Different Ways to Add Parentheses	Medium
242. Valid Anagram	Easy		2 years ago	0242-valid-anagram.py
243. Shortest Word Distance	Easy	Premium	last year	0243-shortest-word-distance.py
244. Shortest Word Distance II	Medium	Premium
245. Shortest Word Distance III	Medium	Premium	last year	0245-shortest-word-distance-iii.py
246. Strobogrammatic Number	Easy	Premium	2 years ago	0246-strobogrammatic-number.py
247. Strobogrammatic Number II	Medium	Premium	2 years ago	0247-strobogrammatic-number-ii.py
249. Group Shifted Strings	Medium	Premium	2 years ago	0249-group-shifted-strings.py
250. Count Univalue Subtrees	Medium	Premium	last year	0250-count-univalue-subtrees.py
251. Flatten 2D Vector	Medium	Premium	2 years ago	0251-flatten-2d-vector.py
252. Meeting Rooms	Easy	Premium	2 years ago	0252-meeting-rooms.py
253. Meeting Rooms II	Medium	Premium	2 years ago	0253-meeting-rooms-ii.py
254. Factor Combinations	Medium	Premium
255. Verify Preorder Sequence in Binary Search Tree	Medium	Premium	4 months ago	0255-verify-preorder-sequence-in-binary-search-tree.py
256. Paint House	Medium	Premium	2 years ago	0256-paint-house.py
257. Binary Tree Paths	Easy		last year	0257-binary-tree-paths.py
258. Add Digits	Easy		2 years ago	0258-add-digits.py
259. 3Sum Smaller	Medium	Premium
260. Single Number III	Medium		3 months ago	0260-single-number-iii.py
261. Graph Valid Tree	Medium	Premium
263. Ugly Number	Easy		2 years ago	0263-ugly-number.py
264. Ugly Number II	Medium
266. Palindrome Permutation	Easy	Premium	last week	0266-palindrome-permutation.py
267. Palindrome Permutation II	Medium	Premium
268. Missing Number	Easy		2 years ago	0268-missing-number.py
269. Alien Dictionary	Hard	Premium
270. Closest Binary Search Tree Value	Easy	Premium	10 months ago	0270-closest-binary-search-tree-value.py
271. Encode and Decode Strings	Medium	Premium	last year	0271-encode-and-decode-strings.py
273. Integer to English Words	Hard
274. H-Index	Medium
275. H-Index II	Medium
276. Paint Fence	Medium	Premium	6 months ago	0276-paint-fence.py
277. Find the Celebrity	Medium	Premium	2 years ago	0277-find-the-celebrity.py
278. First Bad Version	Easy
279. Perfect Squares	Medium		2 years ago	0279-perfect-squares.py
280. Wiggle Sort	Medium	Premium	last year	0280-wiggle-sort.py
282. Expression Add Operators	Hard
283. Move Zeroes	Easy		last year	0283-move-zeroes.py
284. Peeking Iterator	Medium
285. Inorder Successor in BST	Medium	Premium
286. Walls and Gates	Medium	Premium
287. Find the Duplicate Number	Medium		last year	0287-find-the-duplicate-number.py
288. Unique Word Abbreviation	Medium	Premium
289. Game of Life	Medium		2 years ago	0289-game-of-life.py
290. Word Pattern	Easy		2 years ago	0290-word-pattern.py
291. Word Pattern II	Medium	Premium	3 months ago	0291-word-pattern-ii.py
293. Flip Game	Easy	Premium	7 months ago	0293-flip-game.py
295. Find Median from Data Stream	Hard		2 years ago	0295-find-median-from-data-stream.py
296. Best Meeting Point	Hard	Premium	8 months ago	0296-best-meeting-point.py
297. Serialize and Deserialize Binary Tree	Hard
298. Binary Tree Longest Consecutive Sequence	Medium	Premium	2 years ago	0298-binary-tree-longest-consecutive-sequence.py
299. Bulls and Cows	Medium
300. Longest Increasing Subsequence	Medium		2 years ago	0300-longest-increasing-subsequence.py
301. Remove Invalid Parentheses	Hard
303. Range Sum Query - Immutable	Easy		last year	0303-range-sum-query-immutable.py
304. Range Sum Query 2D - Immutable	Medium		2 years ago	0304-range-sum-query-2d-immutable.py
305. Number of Islands II	Hard	Premium	4 months ago	0305-number-of-islands-ii.py
307. Range Sum Query - Mutable	Medium		2 years ago	0307-range-sum-query-mutable.py
309. Best Time to Buy and Sell Stock with Cooldown	Medium		2 years ago	0309-best-time-to-buy-and-sell-stock-with-cooldown.py
310. Minimum Height Trees	Medium		4 months ago	0310-minimum-height-trees.py
311. Sparse Matrix Multiplication	Medium	Premium	2 years ago	0311-sparse-matrix-multiplication.py
314. Binary Tree Vertical Order Traversal	Medium	Premium	2 years ago	0314-binary-tree-vertical-order-traversal.py
316. Remove Duplicate Letters	Medium		2 years ago	0316-remove-duplicate-letters.py
317. Shortest Distance from All Buildings	Hard	Premium
318. Maximum Product of Word Lengths	Medium		2 years ago	0318-maximum-product-of-word-lengths.py
319. Bulb Switcher	Medium		last year	0319-bulb-switcher.py
320. Generalized Abbreviation	Medium	Premium
322. Coin Change	Medium		2 years ago	0322-coin-change.py
323. Number of Connected Components in an Undirected Graph	Medium	Premium	2 years ago	0323-number-of-connected-components-in-an-undirected-graph.py
325. Maximum Size Subarray Sum Equals k	Medium	Premium
326. Power of Three	Easy		2 years ago	0326-power-of-three.py
328. Odd Even Linked List	Medium		2 years ago	0328-odd-even-linked-list.py
329. Longest Increasing Path in a Matrix	Hard		2 years ago	0329-longest-increasing-path-in-a-matrix.py
331. Verify Preorder Serialization of a Binary Tree	Medium
332. Reconstruct Itinerary	Hard		last year	0332-reconstruct-itinerary.py
333. Largest BST Subtree	Medium	Premium
334. Increasing Triplet Subsequence	Medium		last year	0334-increasing-triplet-subsequence.py
337. House Robber III	Medium
338. Counting Bits	Easy		last year	0338-counting-bits.py
339. Nested List Weight Sum	Medium	Premium
340. Longest Substring with At Most K Distinct Characters	Medium	Premium	last year	0340-longest-substring-with-at-most-k-distinct-characters.py
341. Flatten Nested List Iterator	Medium		10 months ago	0341-flatten-nested-list-iterator.py
342. Power of Four	Easy		2 years ago	0342-power-of-four.py
343. Integer Break	Medium		last year	0343-integer-break.py
344. Reverse String	Easy		2 years ago	0344-reverse-string.py
345. Reverse Vowels of a String	Easy		2 years ago	0345-reverse-vowels-of-a-string.py
346. Moving Average from Data Stream	Easy	Premium	last year	0346-moving-average-from-data-stream.py
347. Top K Frequent Elements	Medium		2 years ago	0347-top-k-frequent-elements.py
348. Design Tic-Tac-Toe	Medium	Premium	last year	0348-design-tic-tac-toe.py
349. Intersection of Two Arrays	Easy		last year	0349-intersection-of-two-arrays.py
350. Intersection of Two Arrays II	Easy		last year	0350-intersection-of-two-arrays-ii.py
351. Android Unlock Patterns	Medium	Premium	yesterday	0351-android-unlock-patterns.py
353. Design Snake Game	Medium	Premium
354. Russian Doll Envelopes	Hard
355. Design Twitter	Medium
358. Rearrange String k Distance Apart	Hard	Premium	last year	0358-rearrange-string-k-distance-apart.py
359. Logger Rate Limiter	Easy	Premium
360. Sort Transformed Array	Medium	Premium
362. Design Hit Counter	Medium	Premium	2 years ago	0362-design-hit-counter.py
364. Nested List Weight Sum II	Medium	Premium
366. Find Leaves of Binary Tree	Medium	Premium	2 years ago	0366-find-leaves-of-binary-tree.py
367. Valid Perfect Square	Easy
368. Largest Divisible Subset	Medium		6 months ago	0368-largest-divisible-subset.py
369. Plus One Linked List	Medium	Premium
370. Range Addition	Medium	Premium
373. Find K Pairs with Smallest Sums	Medium		last year	0373-find-k-pairs-with-smallest-sums.py
374. Guess Number Higher or Lower	Easy		2 years ago	0374-guess-number-higher-or-lower.py
376. Wiggle Subsequence	Medium
377. Combination Sum IV	Medium		2 years ago	0377-combination-sum-iv.py
378. Kth Smallest Element in a Sorted Matrix	Medium
379. Design Phone Directory	Medium	Premium
380. Insert Delete GetRandom O(1)	Medium		7 months ago	0380-insert-delete-getrandom-o1.py
381. Insert Delete GetRandom O(1) - Duplicates allowed	Hard
382. Linked List Random Node	Medium		2 years ago	0382-linked-list-random-node.py
383. Ransom Note	Easy		2 years ago	0383-ransom-note.py
384. Shuffle an Array	Medium
387. First Unique Character in a String	Easy		2 years ago	0387-first-unique-character-in-a-string.py
389. Find the Difference	Easy		2 years ago	0389-find-the-difference.py
392. Is Subsequence	Easy		2 years ago	0392-is-subsequence.py
394. Decode String	Medium
395. Longest Substring with At Least K Repeating Characters	Medium
399. Evaluate Division	Medium		last year	0399-evaluate-division.py
401. Binary Watch	Easy
402. Remove K Digits	Medium		4 months ago	0402-remove-k-digits.py
403. Frog Jump	Hard		last year	0403-frog-jump.py
404. Sum of Left Leaves	Easy		4 months ago	0404-sum-of-left-leaves.py
406. Queue Reconstruction by Height	Medium		2 years ago	0406-queue-reconstruction-by-height.py
408. Valid Word Abbreviation	Easy	Premium
409. Longest Palindrome	Easy		10 months ago	0409-longest-palindrome.py
410. Split Array Largest Sum	Hard		2 years ago	0410-split-array-largest-sum.py
412. Fizz Buzz	Easy		2 years ago	0412-fizz-buzz.py
413. Arithmetic Slices	Medium		2 years ago	0413-arithmetic-slices.py
414. Third Maximum Number	Easy		7 months ago	0414-third-maximum-number.py
415. Add Strings	Easy		10 months ago	0415-add-strings.py
416. Partition Equal Subset Sum	Medium
417. Pacific Atlantic Water Flow	Medium		2 years ago	0417-pacific-atlantic-water-flow.py
419. Battleships in a Board	Medium
421. Maximum XOR of Two Numbers in an Array	Medium		2 years ago	0421-maximum-xor-of-two-numbers-in-an-array.py
422. Valid Word Square	Easy	Premium	last year	0422-valid-word-square.py
423. Reconstruct Original Digits from English	Medium
424. Longest Repeating Character Replacement	Medium
426. Convert Binary Search Tree to Sorted Doubly Linked List	Medium	Premium
429. N-ary Tree Level Order Traversal	Medium		last year	0429-n-ary-tree-level-order-traversal.py
430. Flatten a Multilevel Doubly Linked List	Medium
431. Encode N-ary Tree to Binary Tree	Hard	Premium	2 years ago	0431-encode-n-ary-tree-to-binary-tree.py
432. All O-one Data Structure	Hard
433. Minimum Genetic Mutation	Medium		2 years ago	0433-minimum-genetic-mutation.py
434. Number of Segments in a String	Easy		10 months ago	0434-number-of-segments-in-a-string.py
435. Non-overlapping Intervals	Medium
436. Find Right Interval	Medium
437. Path Sum III	Medium
438. Find All Anagrams in a String	Medium		2 years ago	0438-find-all-anagrams-in-a-string.py
439. Ternary Expression Parser	Medium	Premium	last year	0439-ternary-expression-parser.py
441. Arranging Coins	Easy
442. Find All Duplicates in an Array	Medium		5 months ago	0442-find-all-duplicates-in-an-array.py
443. String Compression	Medium		last year	0443-string-compression.py
445. Add Two Numbers II	Medium		last year	0445-add-two-numbers-ii.py
448. Find All Numbers Disappeared in an Array	Easy		6 months ago	0448-find-all-numbers-disappeared-in-an-array.py
449. Serialize and Deserialize BST	Medium
450. Delete Node in a BST	Medium
451. Sort Characters By Frequency	Medium		2 years ago	0451-sort-characters-by-frequency.py
452. Minimum Number of Arrows to Burst Balloons	Medium		2 years ago	0452-minimum-number-of-arrows-to-burst-balloons.py
453. Minimum Moves to Equal Array Elements	Medium
454. 4Sum II	Medium		2 years ago	0454-4sum-ii.py
455. Assign Cookies	Easy		8 months ago	0455-assign-cookies.py
456. 132 Pattern	Medium		last year	0456-132-pattern.py
459. Repeated Substring Pattern	Easy		last year	0459-repeated-substring-pattern.py
460. LFU Cache	Hard
461. Hamming Distance	Easy		10 months ago	0461-hamming-distance.py
462. Minimum Moves to Equal Array Elements II	Medium		2 years ago	0462-minimum-moves-to-equal-array-elements-ii.py
463. Island Perimeter	Easy		4 months ago	0463-island-perimeter.py
468. Validate IP Address	Medium
470. Implement Rand10() Using Rand7()	Medium
474. Ones and Zeroes	Medium
476. Number Complement	Easy		last year	0476-number-complement.py
478. Generate Random Point in a Circle	Medium
480. Sliding Window Median	Hard
482. License Key Formatting	Easy
484. Find Permutation	Medium	Premium	2 years ago	0484-find-permutation.py
485. Max Consecutive Ones	Easy		2 weeks ago	0485-max-consecutive-ones.py
486. Predict the Winner	Medium		last year	0486-predict-the-winner.py
487. Max Consecutive Ones II	Medium	Premium	9 months ago	0487-max-consecutive-ones-ii.py
489. Robot Room Cleaner	Hard	Premium
490. The Maze	Medium	Premium	last year	0490-the-maze.py
491. Non-decreasing Subsequences	Medium		last year	0491-non-decreasing-subsequences.py
492. Construct the Rectangle	Easy		4 months ago	0492-construct-the-rectangle.py
495. Teemo Attacking	Easy		5 days ago	0495-teemo-attacking.py
496. Next Greater Element I	Easy
497. Random Point in Non-overlapping Rectangles	Medium
498. Diagonal Traverse	Medium
500. Keyboard Row	Easy
501. Find Mode in Binary Search Tree	Easy		10 months ago	0501-find-mode-in-binary-search-tree.py
502. IPO	Hard		last year	0502-ipo.py
503. Next Greater Element II	Medium
504. Base 7	Easy
505. The Maze II	Medium	Premium	2 years ago	0505-the-maze-ii.py
506. Relative Ranks	Easy		3 months ago	0506-relative-ranks.py
507. Perfect Number	Easy
508. Most Frequent Subtree Sum	Medium
509. Fibonacci Number	Easy		2 years ago	0509-fibonacci-number.py
510. Inorder Successor in BST II	Medium	Premium	2 years ago	0510-inorder-successor-in-bst-ii.py
513. Find Bottom Left Tree Value	Medium		6 months ago	0513-find-bottom-left-tree-value.py
515. Find Largest Value in Each Tree Row	Medium		10 months ago	0515-find-largest-value-in-each-tree-row.py
518. Coin Change II	Medium		last year	0518-coin-change-ii.py
520. Detect Capital	Easy		2 years ago	0520-detect-capital.py
521. Longest Uncommon Subsequence I	Easy
523. Continuous Subarray Sum	Medium		2 years ago	0523-continuous-subarray-sum.py
524. Longest Word in Dictionary through Deleting	Medium		2 years ago	0524-longest-word-in-dictionary-through-deleting.py
525. Contiguous Array	Medium		5 months ago	0525-contiguous-array.py
526. Beautiful Arrangement	Medium		2 years ago	0526-beautiful-arrangement.py
528. Random Pick with Weight	Medium
529. Minesweeper	Medium
530. Minimum Absolute Difference in BST	Easy		last year	0530-minimum-absolute-difference-in-bst.py
532. K-diff Pairs in an Array	Medium		2 years ago	0532-k-diff-pairs-in-an-array.py
535. Encode and Decode TinyURL	Medium		2 years ago	0535-encode-and-decode-tinyurl.py
537. Complex Number Multiplication	Medium
538. Convert BST to Greater Tree	Medium
540. Single Element in a Sorted Array	Medium
542. 01 Matrix	Medium		last year	0542-01-matrix.py
543. Diameter of Binary Tree	Easy		6 months ago	0543-diameter-of-binary-tree.py
545. Boundary of Binary Tree	Medium	Premium
547. Number of Provinces	Medium		last year	0547-number-of-provinces.py
549. Binary Tree Longest Consecutive Sequence II	Medium	Premium
554. Brick Wall	Medium
557. Reverse Words in a String III	Easy		2 years ago	0557-reverse-words-in-a-string-iii.py
560. Subarray Sum Equals K	Medium		2 years ago	0560-subarray-sum-equals-k.py
563. Binary Tree Tilt	Easy		3 months ago	0563-binary-tree-tilt.py
566. Reshape the Matrix	Easy		2 weeks ago	0566-reshape-the-matrix.py
567. Permutation in String	Medium		2 years ago	0567-permutation-in-string.py
572. Subtree of Another Tree	Easy
573. Squirrel Simulation	Medium	Premium	9 months ago	0573-squirrel-simulation.py
575. Distribute Candies	Easy
576. Out of Boundary Paths	Medium		7 months ago	0576-out-of-boundary-paths.py
581. Shortest Unsorted Continuous Subarray	Medium
582. Kill Process	Medium	Premium	2 years ago	0582-kill-process.py
583. Delete Operation for Two Strings	Medium		2 years ago	0583-delete-operation-for-two-strings.py
588. Design In-Memory File System	Hard	Premium
589. N-ary Tree Preorder Traversal	Easy
593. Valid Square	Medium
594. Longest Harmonious Subsequence	Easy
598. Range Addition II	Easy
599. Minimum Index Sum of Two Lists	Easy		6 months ago	0599-minimum-index-sum-of-two-lists.py
600. Non-negative Integers without Consecutive Ones	Hard
605. Can Place Flowers	Easy		2 years ago	0605-can-place-flowers.py
606. Construct String from Binary Tree	Easy		2 years ago	0606-construct-string-from-binary-tree.py
609. Find Duplicate File in System	Medium
611. Valid Triangle Number	Medium
621. Task Scheduler	Medium		5 months ago	0621-task-scheduler.py
622. Design Circular Queue	Medium		2 years ago	0622-design-circular-queue.py
623. Add One Row to Tree	Medium		4 months ago	0623-add-one-row-to-tree.py
624. Maximum Distance in Arrays	Medium	Premium	9 months ago	0624-maximum-distance-in-arrays.py
628. Maximum Product of Three Numbers	Easy
633. Sum of Square Numbers	Medium		2 months ago	0633-sum-of-square-numbers.py
637. Average of Levels in Binary Tree	Easy		2 years ago	0637-average-of-levels-in-binary-tree.py
639. Decode Ways II	Hard
643. Maximum Average Subarray I	Easy
645. Set Mismatch	Easy		2 years ago	0645-set-mismatch.py
646. Maximum Length of Pair Chain	Medium		last year	0646-maximum-length-of-pair-chain.py
647. Palindromic Substrings	Medium		2 years ago	0647-palindromic-substrings.py
648. Replace Words	Medium		2 months ago	0648-replace-words.py
649. Dota2 Senate	Medium		last year	0649-dota2-senate.py
653. Two Sum IV - Input is a BST	Easy
657. Robot Return to Origin	Easy
658. Find K Closest Elements	Medium		2 years ago	0658-find-k-closest-elements.py
661. Image Smoother	Easy		8 months ago	0661-image-smoother.py
662. Maximum Width of Binary Tree	Medium		2 years ago	0662-maximum-width-of-binary-tree.py
663. Equal Tree Partition	Medium	Premium
665. Non-decreasing Array	Medium
667. Beautiful Arrangement II	Medium
669. Trim a Binary Search Tree	Medium
671. Second Minimum Node In a Binary Tree	Easy
673. Number of Longest Increasing Subsequence	Medium		last year	0673-number-of-longest-increasing-subsequence.py
674. Longest Continuous Increasing Subsequence	Easy
677. Map Sum Pairs	Medium
678. Valid Parenthesis String	Medium		4 months ago	0678-valid-parenthesis-string.py
680. Valid Palindrome II	Easy		2 years ago	0680-valid-palindrome-ii.py
682. Baseball Game	Easy		2 years ago	0682-baseball-game.py
688. Knight Probability in Chessboard	Medium		last year	0688-knight-probability-in-chessboard.py
692. Top K Frequent Words	Medium		2 years ago	0692-top-k-frequent-words.py
694. Number of Distinct Islands	Medium	Premium	2 years ago	0694-number-of-distinct-islands.py
695. Max Area of Island	Medium
696. Count Binary Substrings	Easy
697. Degree of an Array	Easy		6 months ago	0697-degree-of-an-array.py
700. Search in a Binary Search Tree	Easy		2 years ago	0700-search-in-a-binary-search-tree.py
701. Insert into a Binary Search Tree	Medium		2 years ago	0701-insert-into-a-binary-search-tree.py
702. Search in a Sorted Array of Unknown Size	Medium	Premium
703. Kth Largest Element in a Stream	Easy		2 years ago	0703-kth-largest-element-in-a-stream.py
704. Binary Search	Easy		2 years ago	0704-binary-search.py
705. Design HashSet	Easy		2 years ago	0705-design-hashset.py
706. Design HashMap	Easy		last year	0706-design-hashmap.py
708. Insert into a Sorted Circular Linked List	Medium	Premium
709. To Lower Case	Easy
713. Subarray Product Less Than K	Medium		5 months ago	0713-subarray-product-less-than-k.py
714. Best Time to Buy and Sell Stock with Transaction Fee	Medium
716. Max Stack	Hard	Premium	last year	0716-max-stack.py
718. Maximum Length of Repeated Subarray	Medium		2 years ago	0718-maximum-length-of-repeated-subarray.py
722. Remove Comments	Medium
724. Find Pivot Index	Easy
725. Split Linked List in Parts	Medium		last year	0725-split-linked-list-in-parts.py
729. My Calendar I	Medium		last year	0729-my-calendar-i.py
733. Flood Fill	Easy
734. Sentence Similarity	Easy	Premium	last year	0734-sentence-similarity.py
735. Asteroid Collision	Medium		2 years ago	0735-asteroid-collision.py
739. Daily Temperatures	Medium		2 years ago	0739-daily-temperatures.py
740. Delete and Earn	Medium		2 years ago	0740-delete-and-earn.py
742. Closest Leaf in a Binary Tree	Medium	Premium
743. Network Delay Time	Medium		2 years ago	0743-network-delay-time.py
744. Find Smallest Letter Greater Than Target	Easy		last year	0744-find-smallest-letter-greater-than-target.py
746. Min Cost Climbing Stairs	Easy		10 months ago	0746-min-cost-climbing-stairs.py
750. Number Of Corner Rectangles	Medium	Premium
752. Open the Lock	Medium
759. Employee Free Time	Hard	Premium
760. Find Anagram Mappings	Easy	Premium	last year	0760-find-anagram-mappings.py
763. Partition Labels	Medium		2 years ago	0763-partition-labels.py
764. Largest Plus Sign	Medium
766. Toeplitz Matrix	Easy		2 years ago	0766-toeplitz-matrix.py
767. Reorganize String	Medium		last year	0767-reorganize-string.py
771. Jewels and Stones	Easy		2 years ago	0771-jewels-and-stones.py
772. Basic Calculator III	Hard	Premium
774. Minimize Max Distance to Gas Station	Hard	Premium
775. Global and Local Inversions	Medium
779. K-th Symbol in Grammar	Medium		10 months ago	0779-k-th-symbol-in-grammar.py
780. Reaching Points	Hard
783. Minimum Distance Between BST Nodes	Easy		last year	0783-minimum-distance-between-bst-nodes.py
784. Letter Case Permutation	Medium
785. Is Graph Bipartite?	Medium		2 years ago	0785-is-graph-bipartite?.py
787. Cheapest Flights Within K Stops	Medium		6 months ago	0787-cheapest-flights-within-k-stops.py
790. Domino and Tromino Tiling	Medium		2 years ago	0790-domino-and-tromino-tiling.py
791. Custom Sort String	Medium		5 months ago	0791-custom-sort-string.py
792. Number of Matching Subsequences	Medium		2 years ago	0792-number-of-matching-subsequences.py
794. Valid Tic-Tac-Toe State	Medium
797. All Paths From Source to Target	Medium		2 years ago	0797-all-paths-from-source-to-target.py
799. Champagne Tower	Medium		last year	0799-champagne-tower.py
802. Find Eventual Safe States	Medium		last year	0802-find-eventual-safe-states.py
804. Unique Morse Code Words	Easy		2 years ago	0804-unique-morse-code-words.py
814. Binary Tree Pruning	Medium		2 years ago	0814-binary-tree-pruning.py
815. Bus Routes	Hard		last year	0815-bus-routes.py
817. Linked List Components	Medium		2 years ago	0817-linked-list-components.py
819. Most Common Word	Easy
820. Short Encoding of Words	Medium		2 years ago	0820-short-encoding-of-words.py
821. Shortest Distance to a Character	Easy
824. Goat Latin	Easy
826. Most Profit Assigning Work	Medium		last year	0826-most-profit-assigning-work.py
827. Making A Large Island	Hard		2 years ago	0827-making-a-large-island.py
829. Consecutive Numbers Sum	Hard
832. Flipping an Image	Easy
835. Image Overlap	Medium		2 years ago	0835-image-overlap.py
836. Rectangle Overlap	Easy
838. Push Dominoes	Medium
839. Similar String Groups	Hard
840. Magic Squares In Grid	Medium		4 days ago	0840-magic-squares-in-grid.py
841. Keys and Rooms	Medium		2 years ago	0841-keys-and-rooms.py
844. Backspace String Compare	Easy		10 months ago	0844-backspace-string-compare.py
845. Longest Mountain in Array	Medium
846. Hand of Straights	Medium		2 months ago	0846-hand-of-straights.py
847. Shortest Path Visiting All Nodes	Hard		last year	0847-shortest-path-visiting-all-nodes.py
848. Shifting Letters	Medium
849. Maximize Distance to Closest Person	Medium		2 years ago	0849-maximize-distance-to-closest-person.py
852. Peak Index in a Mountain Array	Medium		last year	0852-peak-index-in-a-mountain-array.py
856. Score of Parentheses	Medium		2 years ago	0856-score-of-parentheses.py
858. Mirror Reflection	Medium
859. Buddy Strings	Easy		last year	0859-buddy-strings.py
861. Score After Flipping Matrix	Medium		3 months ago	0861-score-after-flipping-matrix.py
863. All Nodes Distance K in Binary Tree	Medium		last year	0863-all-nodes-distance-k-in-binary-tree.py
865. Smallest Subtree with all the Deepest Nodes	Medium
867. Transpose Matrix	Easy		2 years ago	0867-transpose-matrix.py
869. Reordered Power of 2	Medium		2 years ago	0869-reordered-power-of-2.py
870. Advantage Shuffle	Medium
872. Leaf-Similar Trees	Easy		7 months ago	0872-leaf-similar-trees.py
875. Koko Eating Bananas	Medium		2 years ago	0875-koko-eating-bananas.py
876. Middle of the Linked List	Easy		2 years ago	0876-middle-of-the-linked-list.py
877. Stone Game	Medium
880. Decoded String at Index	Medium		last year	0880-decoded-string-at-index.py
881. Boats to Save People	Medium		2 years ago	0881-boats-to-save-people.py
886. Possible Bipartition	Medium		2 years ago	0886-possible-bipartition.py
887. Super Egg Drop	Hard
890. Find and Replace Pattern	Medium		2 years ago	0890-find-and-replace-pattern.py
895. Maximum Frequency Stack	Hard		2 years ago	0895-maximum-frequency-stack.py
896. Monotonic Array	Easy		last year	0896-monotonic-array.py
897. Increasing Order Search Tree	Easy		2 years ago	0897-increasing-order-search-tree.py
901. Online Stock Span	Medium
904. Fruit Into Baskets	Medium		last year	0904-fruit-into-baskets.py
905. Sort Array By Parity	Easy		2 years ago	0905-sort-array-by-parity.py
909. Snakes and Ladders	Medium		last year	0909-snakes-and-ladders.py
912. Sort an Array	Medium		last year	0912-sort-an-array.py
915. Partition Array into Disjoint Intervals	Medium
916. Word Subsets	Medium		2 years ago	0916-word-subsets.py
917. Reverse Only Letters	Easy		2 years ago	0917-reverse-only-letters.py
918. Maximum Sum Circular Subarray	Medium		last year	0918-maximum-sum-circular-subarray.py
921. Minimum Add to Make Parentheses Valid	Medium
922. Sort Array By Parity II	Easy
923. 3Sum With Multiplicity	Medium		2 years ago	0923-3sum-with-multiplicity.py
926. Flip String to Monotone Increasing	Medium
927. Three Equal Parts	Hard
929. Unique Email Addresses	Easy
930. Binary Subarrays With Sum	Medium		5 months ago	0930-binary-subarrays-with-sum.py
931. Minimum Falling Path Sum	Medium		7 months ago	0931-minimum-falling-path-sum.py
933. Number of Recent Calls	Easy
934. Shortest Bridge	Medium		last year	0934-shortest-bridge.py
935. Knight Dialer	Medium		9 months ago	0935-knight-dialer.py
937. Reorder Data in Log Files	Medium
938. Range Sum of BST	Easy		7 months ago	0938-range-sum-of-bst.py
941. Valid Mountain Array	Easy		2 years ago	0941-valid-mountain-array.py
942. DI String Match	Easy		3 weeks ago	0942-di-string-match.py
944. Delete Columns to Make Sorted	Easy		2 years ago	0944-delete-columns-to-make-sorted.py
945. Minimum Increment to Make Array Unique	Medium		2 months ago	0945-minimum-increment-to-make-array-unique.py
946. Validate Stack Sequences	Medium		2 years ago	0946-validate-stack-sequences.py
947. Most Stones Removed with Same Row or Column	Medium		2 years ago	0947-most-stones-removed-with-same-row-or-column.py
948. Bag of Tokens	Medium		2 years ago	0948-bag-of-tokens.py
950. Reveal Cards In Increasing Order	Medium		4 months ago	0950-reveal-cards-in-increasing-order.py
951. Flip Equivalent Binary Trees	Medium		last year	0951-flip-equivalent-binary-trees.py
953. Verifying an Alien Dictionary	Easy		last year	0953-verifying-an-alien-dictionary.py
954. Array of Doubled Pairs	Medium
957. Prison Cells After N Days	Medium
958. Check Completeness of a Binary Tree	Medium		last year	0958-check-completeness-of-a-binary-tree.py
959. Regions Cut By Slashes	Medium		2 days ago	0959-regions-cut-by-slashes.py
966. Vowel Spellchecker	Medium
967. Numbers With Same Consecutive Differences	Medium		2 years ago	0967-numbers-with-same-consecutive-differences.py
969. Pancake Sorting	Medium
970. Powerful Integers	Medium
973. K Closest Points to Origin	Medium
974. Subarray Sums Divisible by K	Medium		last year	0974-subarray-sums-divisible-by-k.py
976. Largest Perimeter Triangle	Easy		2 years ago	0976-largest-perimeter-triangle.py
977. Squares of a Sorted Array	Easy		4 months ago	0977-squares-of-a-sorted-array.py
978. Longest Turbulent Subarray	Medium
980. Unique Paths III	Hard		2 years ago	0980-unique-paths-iii.py
981. Time Based Key-Value Store	Medium
983. Minimum Cost For Tickets	Medium		last year	0983-minimum-cost-for-tickets.py
985. Sum of Even Numbers After Queries	Medium		2 years ago	0985-sum-of-even-numbers-after-queries.py
986. Interval List Intersections	Medium		2 years ago	0986-interval-list-intersections.py
987. Vertical Order Traversal of a Binary Tree	Hard		2 years ago	0987-vertical-order-traversal-of-a-binary-tree.py
988. Smallest String Starting From Leaf	Medium		4 months ago	0988-smallest-string-starting-from-leaf.py
989. Add to Array-Form of Integer	Easy
991. Broken Calculator	Medium		2 years ago	0991-broken-calculator.py
992. Subarrays with K Different Integers	Hard		5 months ago	0992-subarrays-with-k-different-integers.py
993. Cousins in Binary Tree	Easy
994. Rotting Oranges	Medium
997. Find the Town Judge	Easy		last year	0997-find-the-town-judge.py
1002. Find Common Characters	Easy		2 months ago	1002-find-common-characters.py
1003. Check If Word Is Valid After Substitutions	Medium
1004. Max Consecutive Ones III	Medium
1007. Minimum Domino Rotations For Equal Row	Medium		2 years ago	1007-minimum-domino-rotations-for-equal-row.py
1008. Construct Binary Search Tree from Preorder Traversal	Medium
1009. Complement of Base 10 Integer	Easy		3 years ago	1009-complement-of-base-10-integer.py
1010. Pairs of Songs With Total Durations Divisible by 60	Medium
1011. Capacity To Ship Packages Within D Days	Medium		2 years ago	1011-capacity-to-ship-packages-within-d-days.py
1015. Smallest Integer Divisible by K	Medium
1020. Number of Enclaves	Medium		last year	1020-number-of-enclaves.py
1022. Sum of Root To Leaf Binary Numbers	Easy		3 years ago	1022-sum-of-root-to-leaf-binary-numbers.py
1026. Maximum Difference Between Node and Ancestor	Medium		7 months ago	1026-maximum-difference-between-node-and-ancestor.py
1029. Two City Scheduling	Medium		2 years ago	1029-two-city-scheduling.py
1032. Stream of Characters	Hard
1034. Coloring A Border	Medium
1035. Uncrossed Lines	Medium		last year	1035-uncrossed-lines.py
1038. Binary Search Tree to Greater Sum Tree	Medium		2 months ago	1038-binary-search-tree-to-greater-sum-tree.py
1041. Robot Bounded In Circle	Medium
1043. Partition Array for Maximum Sum	Medium		6 months ago	1043-partition-array-for-maximum-sum.py
1046. Last Stone Weight	Easy		2 years ago	1046-last-stone-weight.py
1047. Remove All Adjacent Duplicates In String	Easy		2 years ago	1047-remove-all-adjacent-duplicates-in-string.py
1048. Longest String Chain	Medium		2 years ago	1048-longest-string-chain.py
1051. Height Checker	Easy		2 months ago	1051-height-checker.py
1052. Grumpy Bookstore Owner	Medium		2 months ago	1052-grumpy-bookstore-owner.py
1055. Shortest Way to Form String	Medium	Premium	last year	1055-shortest-way-to-form-string.py
1056. Confusing Number	Easy	Premium	2 years ago	1056-confusing-number.py
1057. Campus Bikes	Medium	Premium	2 years ago	1057-campus-bikes.py
1059. All Paths from Source Lead to Destination	Medium	Premium
1061. Lexicographically Smallest Equivalent String	Medium	Premium	last year	1061-lexicographically-smallest-equivalent-string.py
1062. Longest Repeating Substring	Medium	Premium	2 weeks ago	1062-longest-repeating-substring.py
1064. Fixed Point	Easy	Premium	2 years ago	1064-fixed-point.py
1065. Index Pairs of a String	Easy	Premium	last year	1065-index-pairs-of-a-string.py
1066. Campus Bikes II	Medium	Premium	2 years ago	1066-campus-bikes-ii.py
1071. Greatest Common Divisor of Strings	Easy		last year	1071-greatest-common-divisor-of-strings.py
1086. High Five	Easy	Premium
1087. Brace Expansion	Medium	Premium	2 years ago	1087-brace-expansion.py
1088. Confusing Number II	Hard	Premium	last year	1088-confusing-number-ii.py
1091. Shortest Path in Binary Matrix	Medium		last year	1091-shortest-path-in-binary-matrix.py
1094. Car Pooling	Medium		3 years ago	1094-car-pooling.py
1099. Two Sum Less Than K	Easy	Premium	9 months ago	1099-two-sum-less-than-k.py
1100. Find K-Length Substrings With No Repeated Characters	Medium	Premium	2 years ago	1100-find-k-length-substrings-with-no-repeated-characters.py
1101. The Earliest Moment When Everyone Become Friends	Medium	Premium	2 years ago	1101-the-earliest-moment-when-everyone-become-friends.py
1102. Path With Maximum Minimum Value	Medium	Premium	2 years ago	1102-path-with-maximum-minimum-value.py
1103. Distribute Candies to People	Easy
1105. Filling Bookcase Shelves	Medium		2 weeks ago	1105-filling-bookcase-shelves.py
1108. Defanging an IP Address	Easy
1119. Remove Vowels from a String	Easy	Premium	5 months ago	1119-remove-vowels-from-a-string.py
1120. Maximum Average Subtree	Medium	Premium	8 months ago	1120-maximum-average-subtree.py
1122. Relative Sort Array	Easy		2 months ago	1122-relative-sort-array.py
1123. Lowest Common Ancestor of Deepest Leaves	Medium
1133. Largest Unique Number	Easy	Premium	2 weeks ago	1133-largest-unique-number.py
1134. Armstrong Number	Easy	Premium
1136. Parallel Courses	Medium	Premium	2 years ago	1136-parallel-courses.py
1137. N-th Tribonacci Number	Easy		last year	1137-n-th-tribonacci-number.py
1143. Longest Common Subsequence	Medium		last year	1143-longest-common-subsequence.py
1150. Check If a Number Is Majority Element in a Sorted Array	Easy	Premium	last year	1150-check-if-a-number-is-majority-element-in-a-sorted-array.py
1151. Minimum Swaps to Group All 1's Together	Medium	Premium	2 years ago	1151-minimum-swaps-to-group-all-1s-together.py
1155. Number of Dice Rolls With Target Sum	Medium		8 months ago	1155-number-of-dice-rolls-with-target-sum.py
1160. Find Words That Can Be Formed by Characters	Easy		9 months ago	1160-find-words-that-can-be-formed-by-characters.py
1161. Maximum Level Sum of a Binary Tree	Medium		last year	1161-maximum-level-sum-of-a-binary-tree.py
1162. As Far from Land as Possible	Medium		last year	1162-as-far-from-land-as-possible.py
1165. Single-Row Keyboard	Easy	Premium	2 years ago	1165-single-row-keyboard.py
1166. Design File System	Medium	Premium	2 years ago	1166-design-file-system.py
1167. Minimum Cost to Connect Sticks	Medium	Premium	2 years ago	1167-minimum-cost-to-connect-sticks.py
1169. Invalid Transactions	Medium
1171. Remove Zero Sum Consecutive Nodes from Linked List	Medium		5 months ago	1171-remove-zero-sum-consecutive-nodes-from-linked-list.py
1182. Shortest Distance to Target Color	Medium	Premium	2 years ago	1182-shortest-distance-to-target-color.py
1189. Maximum Number of Balloons	Easy
1190. Reverse Substrings Between Each Pair of Parentheses	Medium		last month	1190-reverse-substrings-between-each-pair-of-parentheses.py
1197. Minimum Knight Moves	Medium	Premium	10 months ago	1197-minimum-knight-moves.py
1198. Find Smallest Common Element in All Rows	Medium	Premium
1200. Minimum Absolute Difference	Easy		10 months ago	1200-minimum-absolute-difference.py
1207. Unique Number of Occurrences	Easy		2 years ago	1207-unique-number-of-occurrences.py
1208. Get Equal Substrings Within Budget	Medium		3 months ago	1208-get-equal-substrings-within-budget.py
1209. Remove All Adjacent Duplicates in String II	Medium		2 years ago	1209-remove-all-adjacent-duplicates-in-string-ii.py
1213. Intersection of Three Sorted Arrays	Easy	Premium	3 years ago	1213-intersection-of-three-sorted-arrays.py
1214. Two Sum BSTs	Medium	Premium	last year	1214-two-sum-bsts.py
1216. Valid Palindrome III	Hard	Premium	8 months ago	1216-valid-palindrome-iii.py
1217. Minimum Cost to Move Chips to The Same Position	Easy		3 months ago	1217-minimum-cost-to-move-chips-to-the-same-position.py
1218. Longest Arithmetic Subsequence of Given Difference	Medium		last year	1218-longest-arithmetic-subsequence-of-given-difference.py
1219. Path with Maximum Gold	Medium		3 months ago	1219-path-with-maximum-gold.py
1220. Count Vowels Permutation	Hard		10 months ago	1220-count-vowels-permutation.py
1229. Meeting Scheduler	Medium	Premium	2 years ago	1229-meeting-scheduler.py
1230. Toss Strange Coins	Medium	Premium	2 weeks ago	1230-toss-strange-coins.py
1232. Check If It Is a Straight Line	Easy		2 years ago	1232-check-if-it-is-a-straight-line.py
1236. Web Crawler	Medium	Premium	last year	1236-web-crawler.py
1239. Maximum Length of a Concatenated String with Unique Characters	Medium		2 years ago	1239-maximum-length-of-a-concatenated-string-with-unique-characters.py
1242. Web Crawler Multithreaded	Medium	Premium
1245. Tree Diameter	Medium	Premium	6 months ago	1245-tree-diameter.py
1248. Count Number of Nice Subarrays	Medium		2 months ago	1248-count-number-of-nice-subarrays.py
1249. Minimum Remove to Make Valid Parentheses	Medium		3 years ago	1249-minimum-remove-to-make-valid-parentheses.py
1254. Number of Closed Islands	Medium		last year	1254-number-of-closed-islands.py
1260. Shift 2D Grid	Easy		2 years ago	1260-shift-2d-grid.py
1266. Minimum Time Visiting All Points	Easy		9 months ago	1266-minimum-time-visiting-all-points.py
1268. Search Suggestions System	Medium		2 years ago	1268-search-suggestions-system.py
1269. Number of Ways to Stay in the Same Place After Some Steps	Hard		10 months ago	1269-number-of-ways-to-stay-in-the-same-place-after-some-steps.py
1272. Remove Interval	Medium	Premium	2 years ago	1272-remove-interval.py
1274. Number of Ships in a Rectangle	Hard	Premium	2 years ago	1274-number-of-ships-in-a-rectangle.py
1275. Find Winner on a Tic Tac Toe Game	Easy
1277. Count Square Submatrices with All Ones	Medium
1279. Traffic Light Controlled Intersection	Easy	Premium
1282. Group the People Given the Group Size They Belong To	Medium		last year	1282-group-the-people-given-the-group-size-they-belong-to.py
1283. Find the Smallest Divisor Given a Threshold	Medium
1287. Element Appearing More Than 25% In Sorted Array	Easy		8 months ago	1287-element-appearing-more-than-25%-in-sorted-array.py
1288. Remove Covered Intervals	Medium		2 years ago	1288-remove-covered-intervals.py
1289. Minimum Falling Path Sum II	Hard		4 months ago	1289-minimum-falling-path-sum-ii.py
1290. Convert Binary Number in a Linked List to Integer	Easy
1291. Sequential Digits	Medium		2 years ago	1291-sequential-digits.py
1293. Shortest Path in a Grid with Obstacles Elimination	Hard		2 years ago	1293-shortest-path-in-a-grid-with-obstacles-elimination.py
1302. Deepest Leaves Sum	Medium		2 years ago	1302-deepest-leaves-sum.py
1304. Find N Unique Integers Sum up to Zero	Easy
1305. All Elements in Two Binary Search Trees	Medium		2 years ago	1305-all-elements-in-two-binary-search-trees.py
1306. Jump Game III	Medium
1318. Minimum Flips to Make a OR b Equal to c	Medium		last year	1318-minimum-flips-to-make-a-or-b-equal-to-c.py
1319. Number of Operations to Make Network Connected	Medium		last year	1319-number-of-operations-to-make-network-connected.py
1325. Delete Leaves With a Given Value	Medium		3 months ago	1325-delete-leaves-with-a-given-value.py
1328. Break a Palindrome	Medium
1329. Sort the Matrix Diagonally	Medium
1332. Remove Palindromic Subsequences	Easy		2 years ago	1332-remove-palindromic-subsequences.py
1335. Minimum Difficulty of a Job Schedule	Hard		8 months ago	1335-minimum-difficulty-of-a-job-schedule.py
1337. The K Weakest Rows in a Matrix	Easy		last year	1337-the-k-weakest-rows-in-a-matrix.py
1338. Reduce Array Size to The Half	Medium		2 years ago	1338-reduce-array-size-to-the-half.py
1339. Maximum Product of Splitted Binary Tree	Medium		2 years ago	1339-maximum-product-of-splitted-binary-tree.py
1342. Number of Steps to Reduce a Number to Zero	Easy		2 years ago	1342-number-of-steps-to-reduce-a-number-to-zero.py
1344. Angle Between Hands of a Clock	Medium
1347. Minimum Number of Steps to Make Two Strings Anagram	Medium		last year	1347-minimum-number-of-steps-to-make-two-strings-anagram.py
1348. Tweet Counts Per Frequency	Medium
1351. Count Negative Numbers in a Sorted Matrix	Easy		last year	1351-count-negative-numbers-in-a-sorted-matrix.py
1356. Sort Integers by The Number of 1 Bits	Easy		10 months ago	1356-sort-integers-by-the-number-of-1-bits.py
1359. Count All Valid Pickup and Delivery Options	Hard		last year	1359-count-all-valid-pickup-and-delivery-options.py
1372. Longest ZigZag Path in a Binary Tree	Medium		last year	1372-longest-zigzag-path-in-a-binary-tree.py
1376. Time Needed to Inform All Employees	Medium		last year	1376-time-needed-to-inform-all-employees.py
1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Easy		2 years ago	1379-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree.py
1380. Lucky Numbers in a Matrix	Easy		last month	1380-lucky-numbers-in-a-matrix.py
1381. Design a Stack With Increment Operation	Medium
1382. Balance a Binary Search Tree	Medium		2 months ago	1382-balance-a-binary-search-tree.py
1396. Design Underground System	Medium		last year	1396-design-underground-system.py
1402. Reducing Dishes	Hard		last year	1402-reducing-dishes.py
1404. Number of Steps to Reduce a Number in Binary Representation to One	Medium		3 months ago	1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one.py
1413. Minimum Value to Get Positive Step by Step Sum	Easy
1422. Maximum Score After Splitting a String	Easy		8 months ago	1422-maximum-score-after-splitting-a-string.py
1423. Maximum Points You Can Obtain from Cards	Medium		2 years ago	1423-maximum-points-you-can-obtain-from-cards.py
1424. Diagonal Traverse II	Medium		9 months ago	1424-diagonal-traverse-ii.py
1426. Counting Elements	Easy	Premium
1427. Perform String Shifts	Easy	Premium
1428. Leftmost Column with at Least a One	Medium	Premium	2 years ago	1428-leftmost-column-with-at-least-a-one.py
1429. First Unique Number	Medium	Premium
1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Medium	Premium
1431. Kids With the Greatest Number of Candies	Easy		last year	1431-kids-with-the-greatest-number-of-candies.py
1436. Destination City	Easy		8 months ago	1436-destination-city.py
1437. Check If All 1's Are at Least Length K Places Away	Easy
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium		2 months ago	1438-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit.py
1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard
1441. Build an Array With Stack Operations	Medium		10 months ago	1441-build-an-array-with-stack-operations.py
1442. Count Triplets That Can Form Two Arrays of Equal XOR	Medium		3 months ago	1442-count-triplets-that-can-form-two-arrays-of-equal-xor.py
1446. Consecutive Characters	Easy
1448. Count Good Nodes in Binary Tree	Medium		2 years ago	1448-count-good-nodes-in-binary-tree.py
1450. Number of Students Doing Homework at a Given Time	Easy
1451. Rearrange Words in a Sentence	Medium
1452. People Whose List of Favorite Companies Is Not a Subset of Another List	Medium
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy
1456. Maximum Number of Vowels in a Substring of Given Length	Medium		last year	1456-maximum-number-of-vowels-in-a-substring-of-given-length.py
1457. Pseudo-Palindromic Paths in a Binary Tree	Medium		2 years ago	1457-pseudo-palindromic-paths-in-a-binary-tree.py
1460. Make Two Arrays Equal by Reversing Subarrays	Easy		last week	1460-make-two-arrays-equal-by-reversing-subarrays.py
1461. Check If a String Contains All Binary Codes of Size K	Medium		2 years ago	1461-check-if-a-string-contains-all-binary-codes-of-size-k.py
1464. Maximum Product of Two Elements in an Array	Easy		8 months ago	1464-maximum-product-of-two-elements-in-an-array.py
1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium		2 years ago	1465-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts.py
1466. Reorder Routes to Make All Paths Lead to the City Zero	Medium		last year	1466-reorder-routes-to-make-all-paths-lead-to-the-city-zero.py
1469. Find All The Lonely Nodes	Easy	Premium	4 months ago	1469-find-all-the-lonely-nodes.py
1470. Shuffle the Array	Easy		last year	1470-shuffle-the-array.py
1471. The k Strongest Values in an Array	Medium
1472. Design Browser History	Medium
1480. Running Sum of 1d Array	Easy		2 years ago	1480-running-sum-of-1d-array.py
1481. Least Number of Unique Integers after K Removals	Medium		6 months ago	1481-least-number-of-unique-integers-after-k-removals.py
1482. Minimum Number of Days to Make m Bouquets	Medium		2 months ago	1482-minimum-number-of-days-to-make-m-bouquets.py
1485. Clone Binary Tree With Random Pointer	Medium	Premium	2 years ago	1485-clone-binary-tree-with-random-pointer.py
1486. XOR Operation in an Array	Easy
1490. Clone N-ary Tree	Medium	Premium	2 years ago	1490-clone-n-ary-tree.py
1491. Average Salary Excluding the Minimum and Maximum Salary	Easy		2 years ago	1491-average-salary-excluding-the-minimum-and-maximum-salary.py
1492. The kth Factor of n	Medium
1493. Longest Subarray of 1's After Deleting One Element	Medium		last year	1493-longest-subarray-of-1s-after-deleting-one-element.py
1496. Path Crossing	Easy		8 months ago	1496-path-crossing.py
1497. Check If Array Pairs Are Divisible by k	Medium
1502. Can Make Arithmetic Progression From Sequence	Easy		last year	1502-can-make-arithmetic-progression-from-sequence.py
1503. Last Moment Before All Ants Fall Out of a Plank	Medium		10 months ago	1503-last-moment-before-all-ants-fall-out-of-a-plank.py
1506. Find Root of N-Ary Tree	Medium	Premium
1512. Number of Good Pairs	Easy		last year	1512-number-of-good-pairs.py
1513. Number of Substrings With Only 1s	Medium
1518. Water Bottles	Easy		last month	1518-water-bottles.py
1519. Number of Nodes in the Sub-Tree With the Same Label	Medium		last year	1519-number-of-nodes-in-the-sub-tree-with-the-same-label.py
1522. Diameter of N-Ary Tree	Medium	Premium
1523. Count Odd Numbers in an Interval Range	Easy		last year	1523-count-odd-numbers-in-an-interval-range.py
1528. Shuffle String	Easy
1529. Minimum Suffix Flips	Medium
1530. Number of Good Leaf Nodes Pairs	Medium		last month	1530-number-of-good-leaf-nodes-pairs.py
1531. String Compression II	Hard		8 months ago	1531-string-compression-ii.py
1533. Find the Index of the Large Integer	Medium	Premium	last year	1533-find-the-index-of-the-large-integer.py
1535. Find the Winner of an Array Game	Medium		9 months ago	1535-find-the-winner-of-an-array-game.py
1538. Guess the Majority in a Hidden Array	Medium	Premium	last year	1538-guess-the-majority-in-a-hidden-array.py
1539. Kth Missing Positive Number	Easy
1544. Make The String Great	Easy		4 months ago	1544-make-the-string-great.py
1550. Three Consecutive Odds	Easy		now	1550-three-consecutive-odds.py
1551. Minimum Operations to Make Array Equal	Medium
1552. Magnetic Force Between Two Balls	Medium		2 months ago	1552-magnetic-force-between-two-balls.py
1553. Minimum Number of Days to Eat N Oranges	Hard
1557. Minimum Number of Vertices to Reach All Nodes	Medium		last year	1557-minimum-number-of-vertices-to-reach-all-nodes.py
1561. Maximum Number of Coins You Can Get	Medium		9 months ago	1561-maximum-number-of-coins-you-can-get.py
1564. Put Boxes Into the Warehouse I	Medium	Premium	2 years ago	1564-put-boxes-into-the-warehouse-i.py
1566. Detect Pattern of Length M Repeated K or More Times	Easy
1567. Maximum Length of Subarray With Positive Product	Medium
1570. Dot Product of Two Sparse Vectors	Medium	Premium	2 years ago	1570-dot-product-of-two-sparse-vectors.py
1572. Matrix Diagonal Sum	Easy		last year	1572-matrix-diagonal-sum.py
1578. Minimum Time to Make Rope Colorful	Medium		8 months ago	1578-minimum-time-to-make-rope-colorful.py
1580. Put Boxes Into the Warehouse II	Medium	Premium	2 months ago	1580-put-boxes-into-the-warehouse-ii.py
1582. Special Positions in a Binary Matrix	Easy		8 months ago	1582-special-positions-in-a-binary-matrix.py
1584. Min Cost to Connect All Points	Medium		last year	1584-min-cost-to-connect-all-points.py
1586. Binary Search Tree Iterator II	Medium	Premium	2 years ago	1586-binary-search-tree-iterator-ii.py
1598. Crawler Log Folder	Easy		last month	1598-crawler-log-folder.py
1602. Find Nearest Right Node in Binary Tree	Medium	Premium	2 years ago	1602-find-nearest-right-node-in-binary-tree.py
1603. Design Parking System	Easy		last year	1603-design-parking-system.py
1609. Even Odd Tree	Medium		6 months ago	1609-even-odd-tree.py
1611. Minimum One Bit Operations to Make Integers Zero	Hard		9 months ago	1611-minimum-one-bit-operations-to-make-integers-zero.py
1615. Maximal Network Rank	Medium		last year	1615-maximal-network-rank.py
1624. Largest Substring Between Two Equal Characters	Easy		8 months ago	1624-largest-substring-between-two-equal-characters.py
1629. Slowest Key	Easy
1630. Arithmetic Subarrays	Medium		9 months ago	1630-arithmetic-subarrays.py
1631. Path With Minimum Effort	Medium		last year	1631-path-with-minimum-effort.py
1636. Sort Array by Increasing Frequency	Easy		3 weeks ago	1636-sort-array-by-increasing-frequency.py
1637. Widest Vertical Area Between Two Points Containing No Points	Medium		8 months ago	1637-widest-vertical-area-between-two-points-containing-no-points.py
1641. Count Sorted Vowel Strings	Medium
1642. Furthest Building You Can Reach	Medium		2 years ago	1642-furthest-building-you-can-reach.py
1644. Lowest Common Ancestor of a Binary Tree II	Medium	Premium	last year	1644-lowest-common-ancestor-of-a-binary-tree-ii.py
1646. Get Maximum in Generated Array	Easy
1647. Minimum Deletions to Make Character Frequencies Unique	Medium		2 years ago	1647-minimum-deletions-to-make-character-frequencies-unique.py
1650. Lowest Common Ancestor of a Binary Tree III	Medium	Premium
1653. Minimum Deletions to Make String Balanced	Medium		2 weeks ago	1653-minimum-deletions-to-make-string-balanced.py
1657. Determine if Two Strings Are Close	Medium		2 years ago	1657-determine-if-two-strings-are-close.py
1658. Minimum Operations to Reduce X to Zero	Medium		2 years ago	1658-minimum-operations-to-reduce-x-to-zero.py
1660. Correct a Binary Tree	Medium	Premium
1662. Check If Two String Arrays are Equivalent	Easy		2 years ago	1662-check-if-two-string-arrays-are-equivalent.py
1663. Smallest String With A Given Numeric Value	Medium		2 years ago	1663-smallest-string-with-a-given-numeric-value.py
1669. Merge In Between Linked Lists	Medium		5 months ago	1669-merge-in-between-linked-lists.py
1672. Richest Customer Wealth	Easy		2 years ago	1672-richest-customer-wealth.py
1673. Find the Most Competitive Subsequence	Medium
1675. Minimize Deviation in Array	Hard		2 years ago	1675-minimize-deviation-in-array.py
1679. Max Number of K-Sum Pairs	Medium		2 years ago	1679-max-number-of-k-sum-pairs.py
1680. Concatenation of Consecutive Binary Numbers	Medium		2 years ago	1680-concatenation-of-consecutive-binary-numbers.py
1685. Sum of Absolute Differences in a Sorted Array	Medium		9 months ago	1685-sum-of-absolute-differences-in-a-sorted-array.py
1688. Count of Matches in Tournament	Easy		9 months ago	1688-count-of-matches-in-tournament.py
1689. Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium		2 years ago	1689-partitioning-into-minimum-number-of-deci-binary-numbers.py
1695. Maximum Erasure Value	Medium		2 years ago	1695-maximum-erasure-value.py
1700. Number of Students Unable to Eat Lunch	Easy		4 months ago	1700-number-of-students-unable-to-eat-lunch.py
1701. Average Waiting Time	Medium		last month	1701-average-waiting-time.py
1704. Determine if String Halves Are Alike	Easy		7 months ago	1704-determine-if-string-halves-are-alike.py
1706. Where Will the Ball Fall	Medium		2 years ago	1706-where-will-the-ball-fall.py
1710. Maximum Units on a Truck	Easy		2 years ago	1710-maximum-units-on-a-truck.py
1716. Calculate Money in Leetcode Bank	Easy		8 months ago	1716-calculate-money-in-leetcode-bank.py
1717. Maximum Score From Removing Substrings	Medium		last month	1717-maximum-score-from-removing-substrings.py
1721. Swapping Nodes in a Linked List	Medium		2 years ago	1721-swapping-nodes-in-a-linked-list.py
1727. Largest Submatrix With Rearrangements	Medium		9 months ago	1727-largest-submatrix-with-rearrangements.py
1730. Shortest Path to Get Food	Medium	Premium	last year	1730-shortest-path-to-get-food.py
1740. Find Distance in a Binary Tree	Medium	Premium	last month	1740-find-distance-in-a-binary-tree.py
1743. Restore the Array From Adjacent Pairs	Medium		9 months ago	1743-restore-the-array-from-adjacent-pairs.py
1750. Minimum Length of String After Deleting Similar Ends	Medium		5 months ago	1750-minimum-length-of-string-after-deleting-similar-ends.py
1752. Check if Array Is Sorted and Rotated	Easy
1753. Maximum Score From Removing Stones	Medium
1754. Largest Merge Of Two Strings	Medium
1758. Minimum Changes To Make Alternating Binary String	Easy		8 months ago	1758-minimum-changes-to-make-alternating-binary-string.py
1759. Count Number of Homogenous Substrings	Medium		9 months ago	1759-count-number-of-homogenous-substrings.py
1762. Buildings With an Ocean View	Medium	Premium	2 years ago	1762-buildings-with-an-ocean-view.py
1768. Merge Strings Alternately	Easy		last year	1768-merge-strings-alternately.py
1769. Minimum Number of Operations to Move All Balls to Each Box	Medium
1773. Count Items Matching a Rule	Easy
1774. Closest Dessert Cost	Medium
1775. Equal Sum Arrays With Minimum Number of Operations	Medium
1779. Find Nearest Point That Has the Same X or Y Coordinate	Easy		last year	1779-find-nearest-point-that-has-the-same-x-or-y-coordinate.py
1790. Check if One String Swap Can Make Strings Equal	Easy		last year	1790-check-if-one-string-swap-can-make-strings-equal.py
1791. Find Center of Star Graph	Easy		2 months ago	1791-find-center-of-star-graph.py
1804. Implement Trie II (Prefix Tree)	Medium	Premium	last year	1804-implement-trie-ii-prefix-tree.py
1814. Count Nice Pairs in an Array	Medium		9 months ago	1814-count-nice-pairs-in-an-array.py
1822. Sign of the Product of an Array	Easy		last year	1822-sign-of-the-product-of-an-array.py
1823. Find the Winner of the Circular Game	Medium		last month	1823-find-the-winner-of-the-circular-game.py
1832. Check if the Sentence Is Pangram	Easy		2 years ago	1832-check-if-the-sentence-is-pangram.py
1833. Maximum Ice Cream Bars	Medium		2 years ago	1833-maximum-ice-cream-bars.py
1834. Single-Threaded CPU	Medium		2 years ago	1834-single-threaded-cpu.py
1836. Remove Duplicates From an Unsorted Linked List	Medium	Premium	last month	1836-remove-duplicates-from-an-unsorted-linked-list.py
1838. Frequency of the Most Frequent Element	Medium		9 months ago	1838-frequency-of-the-most-frequent-element.py
1844. Replace All Digits with Characters	Easy		6 months ago	1844-replace-all-digits-with-characters.py
1845. Seat Reservation Manager	Medium		9 months ago	1845-seat-reservation-manager.py
1846. Maximum Element After Decreasing and Rearranging	Medium		9 months ago	1846-maximum-element-after-decreasing-and-rearranging.py
1854. Maximum Population Year	Easy		last year	1854-maximum-population-year.py
1870. Minimum Speed to Arrive on Time	Medium		last year	1870-minimum-speed-to-arrive-on-time.py
1874. Minimize Product Sum of Two Arrays	Medium	Premium	2 years ago	1874-minimize-product-sum-of-two-arrays.py
1877. Minimize Maximum Pair Sum in Array	Medium		9 months ago	1877-minimize-maximum-pair-sum-in-array.py
1885. Count Pairs in Two Arrays	Medium	Premium	3 months ago	1885-count-pairs-in-two-arrays.py
1887. Reduction Operations to Make the Array Elements Equal	Medium		9 months ago	1887-reduction-operations-to-make-the-array-elements-equal.py
1897. Redistribute Characters to Make All Strings Equal	Easy		8 months ago	1897-redistribute-characters-to-make-all-strings-equal.py
1903. Largest Odd Number in String	Easy		8 months ago	1903-largest-odd-number-in-string.py
1913. Maximum Product Difference Between Two Pairs	Easy		8 months ago	1913-maximum-product-difference-between-two-pairs.py
1914. Cyclically Rotating a Grid	Medium
1920. Build Array from Permutation	Easy
1921. Eliminate Maximum Number of Monsters	Medium		9 months ago	1921-eliminate-maximum-number-of-monsters.py
1922. Count Good Numbers	Medium
1926. Nearest Exit from Entrance in Maze	Medium		2 years ago	1926-nearest-exit-from-entrance-in-maze.py
1930. Unique Length-3 Palindromic Subsequences	Medium		9 months ago	1930-unique-length-3-palindromic-subsequences.py
1935. Maximum Number of Words You Can Type	Easy
1936. Add Minimum Number of Rungs	Medium
1940. Longest Common Subsequence Between Sorted Arrays	Medium	Premium	3 months ago	1940-longest-common-subsequence-between-sorted-arrays.py
1945. Sum of Digits of String After Convert	Easy
1946. Largest Number After Mutating Substring	Medium
1947. Maximum Compatibility Score Sum	Medium
1961. Check If String Is a Prefix of Array	Easy
1962. Remove Stones to Minimize the Total	Medium		2 years ago	1962-remove-stones-to-minimize-the-total.py
1963. Minimum Number of Swaps to Make the String Balanced	Medium
1964. Find the Longest Valid Obstacle Course at Each Position	Hard
1967. Number of Strings That Appear as Substrings in Word	Easy
1968. Array With Elements Not Equal to Average of Neighbors	Medium
1969. Minimum Non-Zero Product of the Array Elements	Medium
1971. Find if Path Exists in Graph	Easy		2 years ago	1971-find-if-path-exists-in-graph.py
1973. Count Nodes Equal to Sum of Descendants	Medium	Premium	6 months ago	1973-count-nodes-equal-to-sum-of-descendants.py
1980. Find Unique Binary String	Medium		9 months ago	1980-find-unique-binary-string.py
1992. Find All Groups of Farmland	Medium		4 months ago	1992-find-all-groups-of-farmland.py
1996. The Number of Weak Characters in the Game	Medium		2 years ago	1996-the-number-of-weak-characters-in-the-game.py
2000. Reverse Prefix of Word	Easy		4 months ago	2000-reverse-prefix-of-word.py
2007. Find Original Array From Doubled Array	Medium		2 years ago	2007-find-original-array-from-doubled-array.py
2024. Maximize the Confusion of an Exam	Medium		last year	2024-maximize-the-confusion-of-an-exam.py
2037. Minimum Number of Moves to Seat Everyone	Easy		2 months ago	2037-minimum-number-of-moves-to-seat-everyone.py
2038. Remove Colored Pieces if Both Neighbors are the Same Color	Medium		last year	2038-remove-colored-pieces-if-both-neighbors-are-the-same-color.py
2053. Kth Distinct String in an Array	Easy		last week	2053-kth-distinct-string-in-an-array.py
2057. Smallest Index With Equal Value	Easy
2058. Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium		last month	2058-find-the-minimum-and-maximum-number-of-nodes-between-critical-points.py
2059. Minimum Operations to Convert Number	Medium
2061. Number of Spaces Cleaning Robot Cleaned	Medium	Premium	3 months ago	2061-number-of-spaces-cleaning-robot-cleaned.py
2073. Time Needed to Buy Tickets	Easy		4 months ago	2073-time-needed-to-buy-tickets.py
2078. Two Furthest Houses With Different Colors	Easy
2079. Watering Plants	Medium
2080. Range Frequency Queries	Medium
2083. Substrings That Begin and End With the Same Letter	Medium	Premium	2 months ago	2083-substrings-that-begin-and-end-with-the-same-letter.py
2085. Count Common Words With One Occurrence	Easy
2090. K Radius Subarray Averages	Medium		last year	2090-k-radius-subarray-averages.py
2094. Finding 3-Digit Even Numbers	Easy
2095. Delete the Middle Node of a Linked List	Medium		2 years ago	2095-delete-the-middle-node-of-a-linked-list.py
2096. Step-By-Step Directions From a Binary Tree Node to Another	Medium		2 years ago	2096-step-by-step-directions-from-a-binary-tree-node-to-another.py
2101. Detonate the Maximum Bombs	Medium		last year	2101-detonate-the-maximum-bombs.py
2108. Find First Palindromic String in the Array	Easy		6 months ago	2108-find-first-palindromic-string-in-the-array.py
2125. Number of Laser Beams in a Bank	Medium		8 months ago	2125-number-of-laser-beams-in-a-bank.py
2130. Maximum Twin Sum of a Linked List	Medium		last year	2130-maximum-twin-sum-of-a-linked-list.py
2131. Longest Palindrome by Concatenating Two Letter Words	Medium		2 years ago	2131-longest-palindrome-by-concatenating-two-letter-words.py
2134. Minimum Swaps to Group All 1's Together II	Medium		2 weeks ago	2134-minimum-swaps-to-group-all-1s-together-ii.py
2140. Solving Questions With Brainpower	Medium		last year	2140-solving-questions-with-brainpower.py
2147. Number of Ways to Divide a Long Corridor	Hard		9 months ago	2147-number-of-ways-to-divide-a-long-corridor.py
2149. Rearrange Array Elements by Sign	Medium		6 months ago	2149-rearrange-array-elements-by-sign.py
2187. Minimum Time to Complete Trips	Medium		last year	2187-minimum-time-to-complete-trips.py
2191. Sort the Jumbled Numbers	Medium		3 weeks ago	2191-sort-the-jumbled-numbers.py
2192. All Ancestors of a Node in a Directed Acyclic Graph	Medium		2 months ago	2192-all-ancestors-of-a-node-in-a-directed-acyclic-graph.py
2200. Find All K-Distant Indices in an Array	Easy
2201. Count Artifacts That Can Be Extracted	Medium
2202. Maximize the Topmost Element After K Moves	Medium
2214. Minimum Health to Beat Game	Medium	Premium	2 years ago	2214-minimum-health-to-beat-game.py
2215. Find the Difference of Two Arrays	Easy		last year	2215-find-the-difference-of-two-arrays.py
2224. Minimum Number of Operations to Convert Time	Easy
2225. Find Players With Zero or One Losses	Medium		2 years ago	2225-find-players-with-zero-or-one-losses.py
2226. Maximum Candies Allocated to K Children	Medium
2227. Encrypt and Decrypt Strings	Hard		2 years ago	2227-encrypt-and-decrypt-strings.py
2231. Largest Number After Digit Swaps by Parity	Easy
2232. Minimize Result by Adding Parentheses to Expression	Medium
2233. Maximum Product After K Increments	Medium
2243. Calculate Digit Sum of a String	Easy
2244. Minimum Rounds to Complete All Tasks	Medium		2 years ago	2244-minimum-rounds-to-complete-all-tasks.py
2245. Maximum Trailing Zeros in a Cornered Path	Medium
2246. Longest Path With Different Adjacent Characters	Hard		last year	2246-longest-path-with-different-adjacent-characters.py
2256. Minimum Average Difference	Medium		2 years ago	2256-minimum-average-difference.py
2264. Largest 3-Same-Digit Number in String	Easy		9 months ago	2264-largest-3-same-digit-number-in-string.py
2265. Count Nodes Equal to Average of Subtree	Medium		10 months ago	2265-count-nodes-equal-to-average-of-subtree.py
2269. Find the K-Beauty of a Number	Easy
2270. Number of Ways to Split Array	Medium
2271. Maximum White Tiles Covered by a Carpet	Medium
2273. Find Resultant Array After Removing Anagrams	Easy
2274. Maximum Consecutive Floors Without Special Floors	Medium
2275. Largest Combination With Bitwise AND Greater Than Zero	Medium
2279. Maximum Bags With Full Capacity of Rocks	Medium		2 years ago	2279-maximum-bags-with-full-capacity-of-rocks.py
2283. Check if Number Has Equal Digit Count and Digit Value	Easy
2284. Sender With Largest Word Count	Medium
2285. Maximum Total Importance of Roads	Medium
2287. Rearrange Characters to Make Target String	Easy
2288. Apply Discount to Prices	Medium
2293. Min Max Game	Easy
2294. Partition Array Such That Maximum Difference Is K	Medium
2295. Replace Elements in an Array	Medium		2 years ago	2295-replace-elements-in-an-array.py
2300. Successful Pairs of Spells and Potions	Medium		last year	2300-successful-pairs-of-spells-and-potions.py
2303. Calculate Amount Paid in Taxes	Easy
2304. Minimum Path Cost in a Grid	Medium
2305. Fair Distribution of Cookies	Medium		last year	2305-fair-distribution-of-cookies.py
2316. Count Unreachable Pairs of Nodes in an Undirected Graph	Medium		last year	2316-count-unreachable-pairs-of-nodes-in-an-undirected-graph.py
2331. Evaluate Boolean Binary Tree	Easy		3 months ago	2331-evaluate-boolean-binary-tree.py
2335. Minimum Amount of Time to Fill Cups	Easy
2336. Smallest Number in Infinite Set	Medium		last year	2336-smallest-number-in-infinite-set.py
2348. Number of Zero-Filled Subarrays	Medium		last year	2348-number-of-zero-filled-subarrays.py
2353. Design a Food Rating System	Medium		8 months ago	2353-design-a-food-rating-system.py
2357. Make Array Zero by Subtracting Equal Amounts	Easy
2358. Maximum Number of Groups Entering a Competition	Medium
2359. Find Closest Node to Given Two Nodes	Medium
2366. Minimum Replacements to Sort the Array	Hard		last year	2366-minimum-replacements-to-sort-the-array.py
2369. Check if There is a Valid Partition For The Array	Medium		last year	2369-check-if-there-is-a-valid-partition-for-the-array.py
2385. Amount of Time for Binary Tree to Be Infected	Medium		7 months ago	2385-amount-of-time-for-binary-tree-to-be-infected.py
2389. Longest Subsequence With Limited Sum	Easy		2 years ago	2389-longest-subsequence-with-limited-sum.py
2390. Removing Stars From a String	Medium		last year	2390-removing-stars-from-a-string.py
2391. Minimum Amount of Time to Collect Garbage	Medium		9 months ago	2391-minimum-amount-of-time-to-collect-garbage.py
2393. Count Strictly Increasing Subarrays	Medium	Premium	last year	2393-count-strictly-increasing-subarrays.py
2404. Most Frequent Even Element	Easy
2405. Optimal Partition of String	Medium		last year	2405-optimal-partition-of-string.py
2406. Divide Intervals Into Minimum Number of Groups	Medium
2418. Sort the People	Easy		3 weeks ago	2418-sort-the-people.py
2419. Longest Subarray With Maximum Bitwise AND	Medium
2433. Find The Original Array of Prefix Xor	Medium		10 months ago	2433-find-the-original-array-of-prefix-xor.py
2437. Number of Valid Clock Times	Easy		10 months ago	2437-number-of-valid-clock-times.py
2439. Minimize Maximum of Array	Medium		last year	2439-minimize-maximum-of-array.py
2441. Largest Positive Integer That Exists With Its Negative	Easy		4 months ago	2441-largest-positive-integer-that-exists-with-its-negative.py
2446. Determine if Two Events Have Conflict	Easy
2455. Average Value of Even Numbers That Are Divisible by Three	Easy
2456. Most Popular Video Creator	Medium
2457. Minimum Addition to Make Integer Beautiful	Medium
2465. Number of Distinct Averages	Easy
2466. Count Ways To Build Good Strings	Medium
2469. Convert the Temperature	Easy		2 years ago	2469-convert-the-temperature.py
2470. Number of Subarrays With LCM Equal to K	Medium		2 years ago	2470-number-of-subarrays-with-lcm-equal-to-k.py
2471. Minimum Number of Operations to Sort a Binary Tree by Level	Medium		2 years ago	2471-minimum-number-of-operations-to-sort-a-binary-tree-by-level.py
2482. Difference Between Ones and Zeros in Row and Column	Medium		8 months ago	2482-difference-between-ones-and-zeros-in-row-and-column.py
2483. Minimum Penalty for a Shop	Medium		last year	2483-minimum-penalty-for-a-shop.py
2485. Find the Pivot Integer	Easy		5 months ago	2485-find-the-pivot-integer.py
2486. Append Characters to String to Make Subsequence	Medium		2 months ago	2486-append-characters-to-string-to-make-subsequence.py
2487. Remove Nodes From Linked List	Medium		3 months ago	2487-remove-nodes-from-linked-list.py
2490. Circular Sentence	Easy
2491. Divide Players Into Teams of Equal Skill	Medium
2492. Minimum Score of a Path Between Two Cities	Medium		last year	2492-minimum-score-of-a-path-between-two-cities.py
2498. Frog Jump II	Medium		last year	2498-frog-jump-ii.py
2505. Bitwise OR of All Subsequence Sums	Medium	Premium	4 months ago	2505-bitwise-or-of-all-subsequence-sums.py
2511. Maximum Enemy Forts That Can Be Captured	Easy
2512. Reward Top K Students	Medium
2514. Count Anagrams	Hard
2515. Shortest Distance to Target String in a Circular Array	Easy
2517. Maximum Tastiness of Candy Basket	Medium
2529. Maximum Count of Positive Integer and Negative Integer	Easy
2530. Maximal Score After Applying K Operations	Medium
2531. Make Number of Distinct Characters Equal	Medium
2540. Minimum Common Value	Easy		5 months ago	2540-minimum-common-value.py
2541. Minimum Operations to Make Array Equal II	Medium
2542. Maximum Subsequence Score	Medium		last year	2542-maximum-subsequence-score.py
2544. Alternating Digit Sum	Easy
2545. Sort the Students by Their Kth Score	Medium
2546. Apply Bitwise Operations to Make Strings Equal	Medium
2549. Count Distinct Numbers on Board	Easy
2550. Count Collisions of Monkeys on a Polygon	Medium
2553. Separate the Digits in an Array	Easy
2554. Maximum Number of Integers to Choose From a Range I	Medium
2558. Take Gifts From the Richest Pile	Easy
2559. Count Vowel Strings in Ranges	Medium
2562. Find the Array Concatenation Value	Easy
2563. Count the Number of Fair Pairs	Medium
2564. Substring XOR Queries	Medium
2566. Maximum Difference by Remapping a Digit	Easy
2582. Pass the Pillow	Easy		last month	2582-pass-the-pillow.py
2586. Count the Number of Vowel Strings in Range	Easy
2587. Rearrange Array to Maximize Prefix Score	Medium
2588. Count the Number of Beautiful Subarrays	Medium
2591. Distribute Money to Maximum Children	Easy
2592. Maximize Greatness of an Array	Medium
2593. Find Score of an Array After Marking All Elements	Medium
2594. Minimum Time to Repair Cars	Medium
2595. Number of Even and Odd Bits	Easy
2596. Check Knight Tour Configuration	Medium
2597. The Number of Beautiful Subsets	Medium		3 months ago	2597-the-number-of-beautiful-subsets.py
2598. Smallest Missing Non-negative Integer After Operations	Medium
2609. Find the Longest Balanced Substring of a Binary String	Easy
2610. Convert an Array Into a 2D Array With Conditions	Medium		8 months ago	2610-convert-an-array-into-a-2d-array-with-conditions.py
2611. Mice and Cheese	Medium
2616. Minimize the Maximum Difference of Pairs	Medium		last year	2616-minimize-the-maximum-difference-of-pairs.py
2642. Design Graph With Shortest Path Calculator	Hard		9 months ago	2642-design-graph-with-shortest-path-calculator.py
2678. Number of Senior Citizens	Easy		2 weeks ago	2678-number-of-senior-citizens.py
2706. Buy Two Chocolates	Easy		8 months ago	2706-buy-two-chocolates.py
2707. Extra Characters in a String	Medium		last year	2707-extra-characters-in-a-string.py
2743. Count Substrings Without Repeating Character	Medium	Premium	2 months ago	2743-count-substrings-without-repeating-character.py
2785. Sort Vowels in a String	Medium		9 months ago	2785-sort-vowels-in-a-string.py
2802. Find The K-th Lucky Number	Medium	Premium	3 months ago	2802-find-the-k-th-lucky-number.py
2816. Double a Number Represented as a Linked List	Medium		3 months ago	2816-double-a-number-represented-as-a-linked-list.py
2848. Points That Intersect With Cars	Easy
2849. Determine if a Cell Is Reachable at a Given Time	Medium		9 months ago	2849-determine-if-a-cell-is-reachable-at-a-given-time.py
2864. Maximum Odd Binary Number	Easy		6 months ago	2864-maximum-odd-binary-number.py
2870. Minimum Number of Operations to Make Array Empty	Medium		8 months ago	2870-minimum-number-of-operations-to-make-array-empty.py
2958. Length of Longest Subarray With at Most K Frequency	Medium		5 months ago	2958-length-of-longest-subarray-with-at-most-k-frequency.py
2962. Count Subarrays Where Max Element Appears at Least K Times	Medium		5 months ago	2962-count-subarrays-where-max-element-appears-at-least-k-times.py
2966. Divide Array Into Arrays With Max Difference	Medium		7 months ago	2966-divide-array-into-arrays-with-max-difference.py
2971. Find Polygon With the Largest Perimeter	Medium		6 months ago	2971-find-polygon-with-the-largest-perimeter.py
2974. Minimum Number Game	Easy
2975. Maximum Square Area by Removing Fences From a Field	Medium
2976. Minimum Cost to Convert String I	Medium
3005. Count Elements With Maximum Frequency	Easy		5 months ago	3005-count-elements-with-maximum-frequency.py
3014. Minimum Number of Pushes to Type Word I	Easy
3015. Count the Number of Houses at a Certain Distance I	Medium
3016. Minimum Number of Pushes to Type Word II	Medium		last week	3016-minimum-number-of-pushes-to-type-word-ii.py
3062. Winner of the Linked List Game	Easy	Premium	6 months ago	3062-winner-of-the-linked-list-game.py
3063. Linked List Frequency	Medium	Premium	5 months ago	3063-linked-list-frequency.py
3075. Maximize Happiness of Selected Children	Medium		3 months ago	3075-maximize-happiness-of-selected-children.py
3110. Score of a String	Easy		3 months ago	3110-score-of-a-string.py