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 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
1684. Count the Number of Consistent Strings - leetcode link String Simulation Array Counting
1331. Rank Transform of an Array - leetcode link Array Hash Table Sorting
2696. Minimum String Length After Removing Substrings - leetcode link String Stack Simulation
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence - leetcode link String Two Pointer String Matching
2558. Take Gifts From the Richest Pile - leetcode link Array Simulation
3264. Final Array State After K Multiplication Operations I - leetcode link Array Simulation
1971. Find if Path Exists in Graph - leetcode link Graph DFS
1790. Check if One String Swap Can Make Strings Equal - leetcode link Hash map Array Counting
1941. Check if All Characters Have Equal Number of Occurrences - leetcode link Hash map Array Counting
1995. Count Special Quadruplets - leetcode link Hash map Array Counting
2032. Two Out of Three - leetcode link Hash map Array Counting
1550. Three Consecutive Odds - leetcode link Array
1475. Final Prices With a Special Discount in a Shop - leetcode link Array Stack
1974. Minimum Time to Type Word Using Special Typewriter - leetcode link Array Stack
3024. Type of Triangle - leetcode link Array Stack

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
2326. Spiral Matrix IV - Leetcode link Array Hash Table Linked List
2707. Extra Characters in a String - Leetcode link Array Hash Table Dynamic Programming Recurrsion
3043. Find the Length of the Longest Common Prefix - Leetcode link Array Hash Table String Trie
731. My Calendar II - Leetcode link Array Binary search Design Segment Tree Prefix Sum Ordered Set
1497. Check If Array Pairs Are Divisible by k - Leetcode link Array Hash Table Counting
2491. Divide Players Into Teams of Equal Skill - Leetcode link Array Hash Table Sorting Two Pointers
1963. Minimum Number of Swaps to Make the String Balanced - Leetcode link Stack String Two Pointers
921. Minimum Add to Make Parentheses Valid - Leetcode link Stack String Two Pointers
1942. The Number of the Smallest Unoccupied Chair - Leetcode link Array Hash Table Heap(Priority Queue)
1593. Split a String Into the Max Number of Unique Substrings - Leetcode link Array Hash Table Heap(Priority Queue)
2583. Kth Largest Sum in a Binary Tree - Leetcode link Tree BFS Sorting Binary Tree
951.Flip Equivalent Binary Trees - Leetcode link Tree DFS Binary Tree
1233. Remove Sub-Folders from the Filesystem - Leetcode link String Array Sorting
2501. Longest Square Streak in an Array - Leetcode link Hash Table Array Sorting Binary Search
2684. Maximum Number of Moves in a Grid - Leetcode link Hash Table Array Sorting Binary Search
2275. Largest Combination With Bitwise AND Greater Than Zero - Leetcode link Hash Table Array Bit Manipulation Counting
2337. Move Pieces to Obtain a String - Leetcode link Hash Table Array Bit Manipulation Counting
2554. Maximum Number of Integers to Choose From a Range I - Leetcode link Hash Table Array Binary Search Greedy
2593. Find Score of an Array After Marking All Elements - Leetcode link Hash Table Array Sorting Heap(Priority Queue
2425. Bitwise XOR of All Pairings - Leetcode link Hash Table Bit Manipulation
2683. Neighboring Bitwise XOR - Leetcode link Array Bit Manipulation
2661. First Completely Painted Row or Column - Leetcode link Array Bit Manipulation
2017. Grid Game - Leetcode link Array Prefix Sum
802. Find Eventual Safe States - Leetcode link Array Prefix Sum
1462. Course Schedule IV - Leetcode link Graph DFS BFS
2658. Maximum Number of Fish in a Grid - Leetcode link Graph DFS BFS
684. Redundant Connection - Leetcode link Graph DFS BFS
2342. Max Sum of a Pair With Equal Sum of Digits - Leetcode link Hash Table Array
3066. Minimum Operations to Exceed Threshold Value II - Leetcode link Priority Queue Array Simulation
2698. Find the Punishment Number of an Integer - Leetcode link Priority Queue Array Simulation
1718. Construct the Lexicographically Largest Valid Sequence - Leetcode link Backtracking Array
1524. Number of Sub-arrays With Odd Sum - Leetcode link Prefix Sum Array
1749. Maximum Absolute Sum of Any Subarray - Leetcode link Prefix Sum Array
3191. Minimum Operations to Make Binary Array Elements Equal to One I - Leetcode link Bit Manipulation Prefix Sum Array
2115. Find All Possible Recipes from Given Supplies - Leetcode link Array BFS DFS Hash Set
3169. Count Days Without Meetings - Leetcode link Array BFS DFS Hash Set
2033. Minimum Operations to Make a Uni-Value Grid - Leetcode link Array Math Sorting Matrix
1123. Lowest Common Ancestor of Deepest Leaves - Leetcode link Array Sliding Window
2799. Count Complete Subarrays in an Array - Leetcode link Array Math Sorting Matrix
2962. Count Subarrays Where Max Element Appears at Least K Times - Leetcode link Array Math Sorting Matrix
3355. Zero Array Transformation I - Leetcode link Array prefix sum

Hard Problems:

76. Minimum Window Substring
2290. Minimum Obstacle Removal to Reach Corner Leetcode link Array Breadth-First-Search Graph Heap(Priority Queue) Matrix Shortest Path
2493. Divide Nodes Into the Maximum Number of GroupsLeetcode link Array Breadth-First-Search Graph Heap(Priority Queue) Matrix Shortest Path
- 2503. Maximum Number of Points From Grid Queries - Leetcode link DFS BFS Tree Hash Table

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