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My LeetCode Solutions in JAVA

Array

# Title Solution Difficulty
35 Search Insert Position JAVA Easy
53 Maximum Subarray JAVA Easy
1 Two Sum JAVA Easy
167 Two Sum II - Input array is sorted JAVA Easy
15 Three Sum JAVA Medium
16 3Sum Closest JAVA Medium
18 4Sum JAVA Medium
26 Remove Duplicates from Sorted Array JAVA Easy
27 Remove Element JAVA Easy
136 Single Number JAVA Easy
121 Best Time to Buy and Sell Stock JAVA Easy
122 Best Time to Buy and Sell Stock II JAVA Easy
123 Best Time to Buy and Sell Stock III JAVA Hard
188 Best Time to Buy and Sell Stock IV JAVA Hard
309 Best Time to Buy and Sell Stock with Cooldown JAVA Hard
495 Teemo Attacking JAVA Medium
485 Max Consecutive Ones JAVA Easy
448 Find All Numbers Disappeared in an Array JAVA Easy
118 Pascal's Triangle JAVA Easy
119 Pascal's Triangle II JAVA Easy
442 Find All Duplicates in an Array JAVA Medium
414 Third Maximum Number JAVA Easy
380 Insert Delete GetRandom O(1) JAVA Medium
381 Insert Delete GetRandom O(1) - Duplicates allowed JAVA Hard
283 MoveZeroes JAVA Easy
268 Missing Number JAVA Easy
238 Product of Array Except Self JAVA Medium
169 Majority Element JAVA Easy
229 Majority Element II JAVA Medium
88 Merge Sorted Array JAVA Easy
189 Rotate Array JAVA Easy
243 Shortest Word Distance JAVA Easy
244 Shortest Word Distance II JAVA Medium
245 Shortest Word Distance III JAVA Medium
242 Valid Anagram JAVA Easy

BFS

# Title Solution Difficulty
529 Minesweeper JAVA Hard

Design

# Title Solution Difficulty
146 LRU Cache JAVA Hard
460 LFU Cache JAVA Hard
173 Binary Search Tree Iterator JAVA Medium
232 Implement Queue using Stacks JAVA Easy
297 Serialize and Deserialize Binary Tree JAVA Medium

Hash Table

# Title Solution Difficulty
217 Contains Duplicate JAVA Easy
219 Contains Duplicate II JAVA Easy
508 MostFrequentSubtreeSum [JAVA](./Hash Table/MostFrequentSubtreeSum) Medium
500 Keyboard Row [JAVA](./Hash Table/KeyboardRow.java) Easy
463 Island Perimeter [JAVA](./Hash Table/IslandPerimeter.java) Easy
447 Number of Boomerangs [JAVA](./Hash Table/NumberofBoomerangs.java) Easy
438 Find All Anagrams in a String [JAVA](./Hash Table/FindAllAnagramsinaString.java) Easy
454 4Sum II [JAVA](./Hash Table/FourSumII.java) Medium
409 Longest Palindrome [JAVA](./Hash Table/LongestPalindrome.java) Easy
246 Strobogrammatic Number [JAVA](./Hash Table/StrobogrammaticNumber.java) Easy
359 Logger Rate Limiter [JAVA](./Hash Table/LoggerRateLimiter.java) Easy
535 Encode and Decode TinyURL [JAVA](./Hash Table/Codec.java) Medium
49 Group Anagrams [JAVA](./Hash Table/GroupAnagrams.java) Medium

Divide and Conquer

# Title Solution Difficulty
215 Kth Largest Element in an Array [JAVA](./Divide and Conquer/FindKthLargest.java) Easy
240 Search a 2D Matrix II [JAVA](./Divide and Conquer/Searcha2DMatrixII.java) Medium

DFS

# Title Solution Difficulty
139 Word Break JAVA Medium
200 Number of Islands JAVA Medium

Linked list

# Title Solution Difficulty
141 Linked List Cycle [JAVA](./Linked List/LinkedListCycle.java) Easy
237 Delete Node in a Linked List [JAVA](./Linked List/DeleteNodeinaLinkedList.java) Easy
160 Intersection of Two Linked Lists [JAVA](./Linked List/IntersectionofTwoLinkedLists.java) Easy
83 Remove Duplicates from Sorted List [JAVA](./Linked List/DeleteDuplicates.java) Easy
203 Remove Linked List Elements [JAVA](./Linked List/RemoveElements.java) Easy
206 Reverse Linked List [JAVA](./Linked List/ReverseList.java) Easy
234 Palindrome Linked List [JAVA](./Linked List/IsPalindrome.java) Easy
21 Merge Two Sorted Lists [JAVA](./Linked List/MergeTwoSortedLists.java) Easy
61 Rotate List [JAVA](./Linked List/RotateList.java) Medium
138 Copy List with Random Pointer [JAVA](./Linked List/CopyListwithRandomPointer.java) Medium
2 Add Two Numbers [JAVA](./Linked List/AddTwoNumbers.java) Medium

Queue

# Title Solution Difficulty
346 Moving Average from Data Stream JAVA Easy
199 Binary Tree Right Side View JAVA Medium
116 Populating Next Right Pointers in Each Node JAVA Medium

Math

# Title Solution Difficulty
9 Palindrome Number JAVA Easy
66 Plus One JAVA Easy
7 Reverse Integer JAVA Easy
168 Excel Sheet Column Title JAVA Easy
171 Excel Sheet Column Number JAVA Easy
372 Super Pow JAVA medium
400 Nth Digit JAVA Easy
204 Count Primes JAVA Easy
396 Rotate Function JAVA Math
371 Sum of Two Integers JAVA Easy
13 SRoman to Integer JAVA Easy

String

# Title Solution Difficulty
125 Valid Palindrome JAVA Easy
344 Reverse String JAVA Easy
345 Reverse Vowels of a String JAVA Easy
67 Add Binary JAVA Easy
293 Flip Game JAVA Easy
520 Detect Capital JAVA Easy
387 First Unique Character in a String JAVA Easy
459 Repeated Substring Pattern JAVA Easy
415 Add Strings JAVA Easy
3 Length Of Longest Substring JAVA Medium

Bit Manipulation

# Title Solution Difficulty
342 Power of Four [JAVA](./Bit Manipulation/IsPowerOfFour.java) Easy
231 Power of Two [JAVA](./Bit Manipulation/IsPowerOfTwo.java) Easy
326 Power of Three [JAVA](./Bit Manipulation/IsPowerOfThree.java) Easy
191 Number of 1 Bits [JAVA](./Bit Manipulation/HammingWeight.java) Easy
461 Hamming Distance [JAVA](./Bit Manipulation/HammingDistance.java) Easy
401 Binary Watch [JAVA](./Bit Manipulation/BinaryWatch.java) Easy
190 [Reverse Bits](https://leetcode.com/problems/reverse bits/?tab=Description) [JAVA](./Bit Manipulation/ReverseBits.java) Easy
476 Number Complement [JAVA](./Bit Manipulation/NumberComplement.java) Easy

Binary Search

# Title Solution Difficulty
278 First Bad Version [JAVA](./Binary Search/FirstBadVersion.java) Easy
365 Valid Perfect Square [JAVA](./Binary Search/IsPerfectSquare.java) Easy
441 Arranging Coins [JAVA](./Binary Search/ArrangeCoins.java) Easy
374 Guess Number Higher or Lower [JAVA](./Binary Search/GuessNumber.java) Easy
69 Sqrt(x) [JAVA](./Binary Search/Sqrtx.java) Easy
50 Pow(x,n) [JAVA](./Binary Search/powxn.java) Medium
74 Search a 2D Matrix [JAVA](./Binary Search/Searcha2DMatrix.java) Medium

Dynamic Programming

# Title Solution Difficulty
303 Range Sum Query - Immutable [JAVA](./Dynamic Programming/RangeSumQueryImmutable.java) Easy
304 Range Sum Query 2D - Immutable [JAVA](./Dynamic Programming/RangeSumQuery2DImmutable.java) Medium
198 House Robber [JAVA](./Dynamic Programming/HouseRobber.java) Easy
213 House Robber II [JAVA](./Dynamic Programming/HouseRobberII.java) Medium
70 Climbing Stairs [JAVA](./Dynamic Programming/ClimbingStairs.java) Medium
256 Paint House [JAVA](./Dynamic Programming/PaintHouse.java) Medium
265 Paint House II [JAVA](./Dynamic Programming/PaintHouseII.java) Hard
377 Combination Sum IV [JAVA](./Dynamic Programming/CombinationSum4.java) Medium
276 Paint Fence [JAVA](./Dynamic Programming/PaintFence.java) Easy
472 Concatenated Words [JAVA](./Dynamic Programming/ConcatenatedWords.java) Hard

Back Tracking

# Title Solution Difficulty
17 Letter Combinations of a Phone Number [JAVA](./Back Tracking/LetterCombinations.java) Medium
294 Flip Game II [JAVA](./Back Tracking/FlipGameII.java) Medium
39 Combination Sum [JAVA](./Back Tracking/CombinationSum.java) Medium
40 Combination Sum II [JAVA](./Back Tracking/CombinationSum2.java) Medium
216 Combination Sum III [JAVA](./Back Tracking/CombinationSum3.java) Medium
22 Generate Parenthesis [JAVA](./Back Tracking/CgenerateParenthesis.java) Medium
140 Word Break II [JAVA](./Back Tracking/word-break-ii.java) Hard

Two Pointers

# Title Solution Difficulty
475 Heaters [JAVA](./Two Pointers/heaters.java) Easy
532 K-diff Pairs in an Array [JAVA](./Two Pointers/KdiffPairsinanArray.java) Easy

Stack

# Title Solution Difficulty
20 Valid Parentheses JAVA Easy

Tree

# Title Solution Difficulty
213 Binary Tree Level Order Traversal II JAVA Easy
257 Binary Tree Paths JAVA Easy
113 Path Sum II JAVA Medium
112 Path Sum JAVA Easy
437 Path Sum III JAVA Easy
404 Sum of Left Leaves JAVA Easy
111 Minimum Depth of Binary Tree JAVA Easy
104 Maximum Depth of Binary Tree JAVA Easy
110 Balanced Binary Tree JAVA Easy
101 Symmetric Tree JAVA Easy
530 Minimum Absolute Difference in BST JAVA Easy
235 Lowest Common Ancestor of a Binary Search Tree JAVA Easy
536 Construct Binary Tree from String JAVA Medium

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