thaihuynhxyz/challenges

Challenge Hacker Rank in my free time.

hackerrank

Problem	Difficulty	Score	Test
Solve Me First	Easy	1/1	2/2
Print the Elements of a Linked List	Easy	5/5	9/9
Insert a Node at the Tail of a Linked List	Easy	5/5	9/9
Insert a node at the head of a linked list	Easy	5/5	7/7
Insert a node at a specific position in a linked list	Easy	5/5	10/10
Delete a Node	Easy	5/5	9/9
Print in Reverse	Easy	5/5	7/7
Reverse a linked list	Easy	5/5	7/7
Compare two linked lists	Easy	5/5	7/7
Merge two sorted linked lists	Easy	5/5	7/7
Get Node Value	Easy	5/5	7/7
Delete duplicate-value nodes from a sorted linked list	Easy	5/5	7/7
Cycle Detection	Medium	5/5	7/7
Find Merge Point of Two Lists	Easy	5/5	7/7
Inserting a Node Into a Sorted Doubly Linked List	Easy	5/5	7/7
Reverse a doubly linked list	Easy	5/5	7/7
Grading Students	Easy	10/10	7/7
Birthday Chocolate	Easy	10/10	14/14
Compare the Triplets	Easy	10/10	8/8
Simple Array Sum	Easy	10/10	3/3
A Very Big Sum	Easy	10/10	2/2
Diagonal Difference	Easy	10/10	11/11
Plus Minus	Easy	10/10	12/12
Staircase	Easy	10/10	9/9
Mini-Max Sum	Easy	10/10	15/15
Arrays - DS	Easy	10/10	9/9
Tree: Preorder Traversal	Easy	10/10	6/6
Tree: Postorder Traversal	Easy	10/10	6/6
Tree: Inorder Traversal	Easy	10/10	6/6
Tree: Height of a Binary Tree	Easy	10/10	6/6
Sock Merchant	Easy	10/10	9/9
2D Array - DS	Easy	15/15	8/8
Dynamic Array	Easy	15/15	11/11
Counting Valleys	Easy	15/15	22/22
Left Rotation	Easy	20/20	10/10
Tree : Top View	Easy	20/20	6/6
Tree: Level Order Traversal	Easy	20/20	6/6
Binary Search Tree : Insertion	Easy	20/20	6/6
Jumping on the clouds	Easy	20/20	9/9
Repeated String	Easy	20/20	23/23
Arrays: Left Rotation	Easy	20/20	11/11
Alternating Characters	Easy	20/20	6/6
Tree: Huffman Decoding	Medium	20/20	7/7
Picking Numbers	Easy	20/20	10/10
Forming_a_Magic_Square	Medium	20/20	23/23
Two strings	Easy	25/25	8/8
Ransom note	Easy	25/25	22/22
String: Making Anagrams	Easy	25/25	16/16
String Construction	Easy	25/25	13/13
Sparse Arrays	Medium	25/25	13/13
Binary Search Tree : Lowest Common Ancestor	Easy	30/30	6/6
Sorting : Bubble Sort	Easy	30/30	4/4
Is This a Binary Search Tree?	Medium	30/30	14/14
Optimal Network Routing	Medium	30/30	20/20
Mark and toys	Easy	35/35	18/18
Sorting: Comparator	Medium	35/35	8/8
Count triplets	Medium	35/35	13/13
Sherlock and valid string	Medium	35/35	13/13
Swap Nodes [Algo]	Medium	40/40	12/12
New year chaos	Medium	40/40	12/12
Minimum swaps	Medium	40/40	15/15
Frequency queries	Medium	40/40	15/15
Fraudulent Activity Notifications	Medium	40/40	8/8
Special String Again	Medium	40/40	18/18
Friend Circle Queries	Hard	45/45	16/16
Merge Sort: Counting Inversions	Hard	45/45	16/16
Sherlock and anagrams	Medium	50/50	7/7
Reverse Shuffle Merge	Advanced	50/50	7/7
Common Child	Medium	60/60	15/15
Chief Hopper	Medium	65/65	16/16
Find Maximum Index Product	Medium	100/100	13/13
Array Pairs	Advanced	100/100	20/20
Rooted Tree	Hard	80/150	4/16

leetcode

Problem	Difficulty	Test
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	60/60
Minimum Operations to Make a Uni-Value Grid	Medium	42/42
Rectangle Area	Medium	3080/3080
Perfect Squares	Medium	588/588
Flip String to Monotone Increasing	Medium	93/93
Find Good Days to Rob the Bank	Medium	144/144
Minimum Distance to Type a Word Using Two Fingers	Hard	144/144
12. Integer to Roman	Easy	kotlin
13. Roman to Integer	Easy	kotlin
21. Merge Two Sorted Lists	Easy	kotlin
26. Remove Duplicates from Sorted Array	Easy	kotlin
27. Remove Element	Easy	kotlin
30. Substring with Concatenation of All Words	Hard	kotlin
36. Valid Sudoku	Medium	kotlin
37. Sudoku Solver	Hard	kotlin
71. Simplify Path	Medium	kotlin
80. Remove Duplicates from Sorted Array II	Medium	kotlin
86. Partition List	Medium	kotlin
92. Reverse Linked List II	Medium	kotlin
104. Maximum Depth of Binary Tree	Easy	kotlin
125. Valid Palindrome	Easy	kotlin
134. Gas Station	Medium	kotlin
135. Candy	Hard	kotlin
141. Linked List Cycle	Easy	kotlin
146. LRU Cache	Easy	kotlin
169. Majority Element	Easy	kotlin
189. Rotate Array	Medium	kotlin
200. Number of Islands	Medium	49/49 rust
209. Minimum Size Subarray Sum	Medium	49/49 rust
215. Kth Largest Element in an Array	Medium	kotlin
228. Summary Ranges	Easy	kotlin
239. Sliding Window Maximum	Hard	kotlin
255. Implement Stack using Queues	Easy	kotlin
274. H-Index	Medium	kotlin
332. Reconstruct Itinerary	Easy	kotlin
338. Counting Bits	Easy	kotlin
377. Combination Sum IV	Medium	kotlin
380. Insert Delete GetRandom O(1)	Medium	kotlin
383. Ransom Note	Easy	kotlin
403. Frog Jump	Easy	kotlin
459. Repeated Substring Pattern	Hard	kotlin
518. Coin Change II	Medium	kotlin
695. Max Area of Island	Medium	728/728 rust
725. Split Linked List in Parts	Medium	kotlin
733. Flood Fill	Easy	277/277 rust
841. Keys and Rooms	Medium	277/277 rust
905. Sort Array By Parity	Easy	277/277 rust
1020. Number of Enclaves	Medium	57/57 rust
1254. Number of Closed Islands	Medium	47/47 rust
1282. Group the People Given the Group Size They Belong To	Medium	47/47 rust
1282. Group the People Given the Group Size They Belong To	Medium	47/47 rust
1337. The K Weakest Rows in a Matrix	Easy	kotlin
1424. Diagonal Traverse II	Medium	kotlin
1561. Maximum Number of Coins You Can Get	Medium	kotlin
1630. Arithmetic Subarrays	Medium	kotlin
1685. Sum of Absolute Differences in a Sorted Array	Medium	kotlin
1716. Calculate Money in Leetcode Bank	Easy	cpp
1727. Largest Submatrix With Rearrangements	Medium	kotlin
1814. Count Nice Pairs in an Array	Medium	kotlin
2186. Minimum Number of Steps to Make Two Strings Anagram II	Medium	kotlin
2366. Minimum Replacements to Sort the Array	Hard	kotlin
2369. Check if There is a Valid Partition For The Array	Medium	kotlin
2391. Minimum Amount of Time to Collect Garbage	Medium	kotlin
2477. Minimum Fuel Cost to Report to the Capital	Medium	kotlin
2483. Minimum Penalty for a Shop	Medium	kotlin
2730. Longest Ideal Subsequence	Medium	kotlin

codility

Problem	Difficulty	Test
Stack of Coins	?	?/?