Solved problems

LeetCode problems solved in Kotlin.

Profile on LeetCode

Total: 162, Easy: 56, Medium: 86, Hard: 20.

Name	Difficulty	Solution
1. Two Sum	Easy	Source
2. Add Two Numbers	Medium	Source
3. Longest Substring Without Repeating Characters	Medium	Source
4. Median of Two Sorted Arrays	Hard	Source
5. Longest Palindromic Substring	Medium	Source
7. Reverse Integer	Easy	Source
8. String to Integer (atoi)	Medium	Source
9. Palindrome Number	Easy	Source
10. Regular Expression Matching	Hard	Source
11. Container With Most Water	Medium	Source
12. Integer to Roman	Medium	Source
14. Longest Common Prefix	Easy	Source
15. 3Sum	Medium	Source
17. Letter Combinations of a Phone Number	Medium	Source
18. 4Sum	Medium	Source
19. Remove Nth Node From End of List	Medium	Source
20. Valid Parentheses	Easy	Source
21. Merge Two Sorted Lists	Easy	Source
22. Generate Parentheses	Medium	Source
23. Merge k Sorted Lists	Hard	Source
26. Remove Duplicates from Sorted Array	Easy	Source
27. Remove Element	Easy	Source
28. Find the Index of the First Occurrence in a String	Medium	Source
31. Next Permutation	Medium	Source
32. Longest Valid Parentheses	Hard	Source
33. Search in Rotated Sorted Array	Medium	Source
34. Find First and Last Position of Element in Sorted Array	Medium	Source
35. Search Insert Position	Easy	Source
36. Valid Sudoku	Medium	Source
38. Count and Say	Medium	Source
41. First Missing Positive	Hard	Source
42. Trapping Rain Water	Hard	Source
45. Jump Game II	Medium	Source
46. Permutations	Medium	Source
48. Rotate Image	Medium	Source
49. Group Anagrams	Medium	Source
53. Maximum Subarray	Easy	Source
54. Spiral Matrix	Medium	Source
55. Jump Game	Medium	Source
56. Merge Intervals	Medium	Source
58. Length of Last Word	Easy	Source
61. Rotate List	Medium	Source
62. Unique Paths	Medium	Source
63. Unique Paths II	Medium	Source
64. Minimum Path Sum	Medium	Source
66. Plus One	Easy	Source
67. Add Binary	Easy	Source
70. Climbing Stairs	Easy	Source
72. Edit Distance	Hard	Source
73. Set Matrix Zeroes	Medium	Source
74. Search a 2D Matrix	Medium	Source
75. Sort Colors	Medium	Source
76. Minimum Window Substring	Hard	Source
79. Word Search	Medium	Source
80. Remove Duplicates from Sorted Array II	Medium	Source
81. Search in Rotated Sorted Array II	Medium	Source
88. Merge Sorted Array	Easy	Source
94. Binary Tree Inorder Traversal	Easy	Source
96. Unique Binary Search Trees	Medium	Source
98. Validate Binary Search Tree	Medium	Source
100. Same Tree	Easy	Source
101. Symmetric Tree	Easy	Source
102. Binary Tree Level Order Traversal	Medium	Source
104. Maximum Depth of Binary Tree	Easy	Source
105. Construct Binary Tree from Preorder and Inorder Traversal	Medium	Source
108. Convert Sorted Array to Binary Search Tree	Easy	Source
110. Balanced Binary Tree	Easy	Source
112. Path Sum	Easy	Source
113. Path Sum II	Medium	Source
114. Flatten Binary Tree to Linked List	Medium	Source
118. Pascal's Triangle	Easy	Source
121. Best Time to Buy and Sell Stock	Easy	Source
122. Best Time to Buy and Sell Stock II	Easy	Source
128. Longest Consecutive Sequence	Medium	Source
130. Surrounded Regions	Medium	Source
136. Single Number	Easy	Source
137. Single Number II	Medium	Source
139. Word Break	Medium	Source
141. Linked List Cycle	Easy	Source
142. Linked List Cycle II	Medium	Source
151. Reverse Words in a String	Medium	Source
153. Find Minimum in Rotated Sorted Array	Medium	Source
155. Min Stack	Medium	Source
160. Intersection of Two Linked Lists	Easy	Source
162. Find Peak Element	Medium	Source
169. Majority Element	Easy	Source
179. Largest Number	Medium	Source
189. Rotate Array	Medium	Source
190. Reverse Bits	Easy	Source
191. Number of 1 Bits	Easy	Source
198. House Robber	Medium	Source
200. Number of Islands	Medium	Source
206. Reverse Linked List	Easy	Source
209. Minimum Size Subarray Sum	Medium	Source
212. Word Search II	Hard	Source
219. Contains Duplicate II	Easy	Source
222. Count Complete Tree Nodes	Medium	Source
223. Rectangle Area	Medium	Source
224. Basic Calculator	Hard	Source
225. Implement Stack using Queues	Easy	Source
226. Invert Binary Tree	Easy	Source
232. Implement Queue using Stacks	Easy	Source
234. Palindrome Linked List	Easy	Source
237. Delete Node in a Linked List	Medium	Source
239. Sliding Window Maximum	Hard	Source
242. Valid Anagram	Easy	Source
260. Single Number III	Medium	Source
263. Ugly Number	Easy	Source
279. Perfect Squares	Medium	Source
283. Move Zeroes	Easy	Source
287. Find the Duplicate Number	Medium	Source
295. Find Median from Data Stream	Hard	Source
300. Longest Increasing Subsequence	Medium	Source
301. Remove Invalid Parentheses	Hard	Source
309. Best Time to Buy and Sell Stock with Cooldown	Medium	Source
322. Coin Change	Medium	Source
338. Counting Bits	Easy	Source
345. Reverse Vowels of a String	Easy	Source
347. Top K Frequent Elements	Medium	Source
374. Guess Number Higher or Lower	Easy	Source
389. Find the Difference	Easy	Source
394. Decode String	Medium	Source
424. Longest Repeating Character Replacement	Medium	Source
433. Minimum Genetic Mutation	Medium	Source
438. Find All Anagrams in a String	Medium	Source
461. Hamming Distance	Easy	Source
480. Sliding Window Median	Hard	Source
523. Continuous Subarray Sum	Medium	Source
543. Diameter of Binary Tree	Easy	Source
547. Number of Provinces	Medium	Source
587. Erect the Fence	Hard	Source
623. Add One Row to Tree	Medium	Source
645. Set Mismatch	Easy	Source
692. Top K Frequent Words	Medium	Source
704. Binary Search	Easy	Source
714. Best Time to Buy and Sell Stock with Transaction Fee	Medium	Source
763. Partition Labels	Medium	Source
766. Toeplitz Matrix	Easy	Source
835. Image Overlap	Medium	Source
899. Orderly Queue	Hard	Source
901. Online Stock Span	Medium	Source
907. Sum of Subarray Minimums	Medium	Source
947. Most Stones Removed with Same Row or Column	Medium	Source
997. Find the Town Judge	Easy	Source
1043. Partition Array for Maximum Sum	Medium	Source
1047. Remove All Adjacent Duplicates In String	Easy	Source
1092. Shortest Common Supersequence	Hard	Source
1143. Longest Common Subsequence	Medium	Source
1207. Unique Number of Occurrences	Easy	Source
1239. Maximum Length of a Concatenated String with Unique Characters	Medium	Source
1293. Shortest Path in a Grid with Obstacles Elimination	Hard	Source
1323. Maximum 69 Number	Easy	Source
1328. Break a Palindrome	Medium	Source
1531. String Compression II	Hard	Source
1544. Make The String Great	Easy	Source
1662. Check If Two String Arrays are Equivalent	Easy	Source
1706. Where Will the Ball Fall	Medium	Source
1832. Check if the Sentence Is Pangram	Easy	Source
1926. Nearest Exit from Entrance in Maze	Medium	Source
2095. Delete the Middle Node of a Linked List	Medium	Source
2131. Longest Palindrome by Concatenating Two Letter Words	Medium	Source
2136. Earliest Possible Day of Full Bloom	Hard	Source