README.md

Leetcode Problems Solutions using Kotlin

Repository description:

in this repository , I am try to practice and enhance my problem solving and coding skills by using kotlin . this repository contains three major folders [easy - medium - hard] based on problem level, you can find the problem in every folder by problem name and number.

• Easy
• Medium
• Hard
  

Easy Problems:

• 303. Range Sum Query - Immutable
• 1920. Build Array from Permutation
• 1913. Maximum Product Difference Between Two Pairs
• 653. Two Sum IV - Input is a BST
• 598. Range Addition II
• 543. Diameter of Binary Tree
• 155. Min Stack
• 226. Invert Binary Tree
• 404. Sum of Left Leaves
• 441. Arranging Coins
• 448. Find All Numbers Disappeared in an Array
• 461. Hamming Distance
• 35. Search Insert Position
• 941. Valid Mountain Array -Leetcode Link
• 1672. Richest Customer Wealth -Leetcode Link
• 121. Best Time to Buy and Sell Stock -Leetcode Link
• 389. Find the Difference -Leetcode Link
• 258. Add Digits -Leetcode Link
• 104. Maximum Depth of Binary Tree -Leetcode Link
• 136. Single Number -Leetcode Link
• 171. Excel Sheet Column Number -Leetcode Link
• 169. Majority Element -Leetcode Link
• 228. Summary Ranges -Leetcode Link
• 338. Counting Bits -Leetcode Link
• 392. Is Subsequence -Leetcode Link
• 21. Merge Two Sorted Lists -Leetcode Link
• 141. Linked List Cycle -Leetcode Link
• 20. Valid Parentheses -Leetcode Link
• 94. Binary Tree Inorder Traversal -Leetcode Link
• 344. Reverse String -Leetcode Link
• 1721. Swapping Nodes in a Linked List -Leetcode Link
• 703. Kth Largest Element in a Stream -Leetcode Link
• 682. Baseball Game -Leetcode Link
• 700. Search in a Binary Search Tree -Leetcode Link
• 905. Sort Array By Parity -Leetcode Link
• 867. Transpose Matrix -Leetcode Link
• 88. Merge Sorted Array -Leetcode Link
• 1332. Remove Palindromic Subsequences -Leetcode Link
• 283. Move Zeroes -Leetcode Link
• 367. Valid Perfect Square -Leetcode Link
• 191. Number of 1 Bits -Leetcode Link
• 231. Power of Two -Leetcode Link
• 268. Missing Number -Leetcode Link
• 2220. Minimum Bit Flips to Convert Number -Leetcode Link
• 13. Roman to Integer -Leetcode Link
• 1089. Duplicate Zeros -Leetcode Link
• 1832. Check if the Sentence Is Pangram -Leetcode Link
• 1662. Check If Two String Arrays are Equivalent -Leetcode Link
• 345. Reverse Vowels of a String -Leetcode Link
• 1323. Maximum 69 Number -Leetcode Link
• 1544. Make The String Great -Leetcode Link
• 374. Guess Number Higher or Lower -Leetcode Link
• 26. Remove Duplicates from Sorted Array -Leetcode Link
• 263. Ugly Number -Leetcode Link
• 111. Minimum Depth of Binary Tree -Leetcode Link
• 144. Binary Tree Preorder Traversal -Leetcode Link
• 145. Binary Tree Postorder Traversal -Leetcode Link
• 1207. Unique Number of Occurrences -Leetcode Link
• 1704. Determine if String Halves Are Alike -Leetcode Link
• 1945. Sum of Digits of String After Convert - leetcode link String Simulation

Medium Problems :

• 1448. Count Good Nodes in Binary Tree
• 91. Decode Ways
• 633. Sum of Square Numbers
• 153. Find Minimum in Rotated Sorted Array
• 437. Path Sum III
• 151. Reverse Words in a String
• 75. Sort Colors
• 130. Surrounded Regions
• 260. Single Number III
• 43. Multiply Strings
• 96. Unique Binary Search Trees
• 122. Best Time to Buy and Sell Stock II
• 62. Unique Paths
• 450. Delete Node in a BST
• 1305. All Elements in Two Binary Search Trees-Leetcode Link
• 189. Rotate Array-Leetcode Link
• 454. 4Sum II-Leetcode Link
• 525. Contiguous Array-Leetcode Link
• 80. Remove Duplicates from Sorted Array II-Leetcode Link
• 532. K-diff Pairs in an Array-Leetcode Link
• 560. Subarray Sum Equals K-Leetcode Link
• 39. Combination Sum-Leetcode Link
• 402. Remove K Digits-Leetcode Link
• 1288. Remove Covered Intervals-Leetcode Link
• 148. Sort List-Leetcode Link
• 165. Compare Version Numbers-Leetcode Link
• 662. Maximum Width of Binary Tree-Leetcode Link
• 413. Arithmetic Slices-Leetcode Link
• 799. Champagne Tower-Leetcode Link
• 740. Delete and Earn-Leetcode Link
• 2. Add Two Number-Leetcode Link
• 71. Simplify Path-Leetcode Link
  
• 946. Validate Stack Sequences-Leetcode Link
  
• 1249. Minimum Remove to Make Valid Parentheses-Leetcode Link
  
• 856. Score of Parentheses-Leetcode Link
  
• 316. Remove Duplicate Letters-Leetcode Link
  
• 1007. Minimum Domino Rotations For Equal Row-Leetcode Link
  
• 74. Search a 2D Matrix-Leetcode Link
  
• 347. Top K Frequent Elements-Leetcode Link
  
• 289. Game of Life-Leetcode Link
  
• 3. Longest Substring Without Repeating Characters-Leetcode Link
  
• 167. Two Sum II - Input Array Is Sorted -Leetcode Link
• 5. Longest Palindromic Substring -Leetcode Link
• 820. Short Encoding of Words -Leetcode Link
• 215. Kth Largest Element inin an Array -Leetcode Link
• 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers -Leetcode Link
• 199. Binary Tree Right Side View -Leetcode Link
• 473. Matchsticks to Square -Leetcode Link
• 102. Binary Tree Level Order Traversal -Leetcode Link
• 114. Flatten Binary Tree to Linked List -Leetcode Link
• 890. Find and Replace Pattern -Leetcode Link
• 729. My Calendar I -Leetcode Link
• 98. Validate Binary Search Tree -Leetcode Link
• 1318. Minimum Flips to Make a OR b Equal to c -Leetcode Link
• 237. Delete Node in a Linked List -Leetcode Link
• 38. Count and Say -Leetcode Link
• 692. Top K Frequent Words -Leetcode Link
• 12. Integer to Roman -Leetcode Link
• 1239. Maximum Length of a Concatenated String with Unique Characters -Leetcode Link
• 523. Continuous Subarray Sum -Leetcode Link
• 49. Group Anagrams -Leetcode Link
• 1706. Where Will the Ball Fall -Leetcode Link
• 433. Minimum Genetic Mutation -Leetcode Link
• 2131. Longest Palindrome by Concatenating Two Letter Words -Leetcode Link
• 901. Online Stock Span -Leetcode Link
• 222. Count Complete Tree Nodes -Leetcode Link
• 223. Rectangle Area -Leetcode Link
• 1926. Nearest Exit from Entrance in Maze -Leetcode Link
• 79. Word Search -Leetcode Link
• 2225. Find Players With Zero or One Losses -Leetcode Link
• 926. Flip String to Monotone Increasing -Leetcode Link
• 1905. Count Sub Islands- Leetcode LinkBFS
• 947. Most Stones Removed with Same Row or Column- Leetcode Link Graph DFS BFS
• 1894. Find the Student that Will Replace the Chalk - Leetcode link Prefix Sum
• 874. Walking Robot Simulation - Leetcode link Array Hash Table Simulation
• 3217. Delete Nodes From Linked List Present in Array - Leetcode link Array Hash Table Linked List

Hard Problems:

• 76. Minimum Window Substring