# LeetCode ### LeetCode Algorithm | # | Title | Solution | Difficulty | | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------- | ---------- | | 1 | [Two Sum](https://leetcode.com/problems/two-sum) | [C](./src/1.c) | Easy | | 2 | [Add Two Numbers](https://leetcode.com/problems/add-two-numbers) | [C](./src/2.c) | Medium | | 3 | [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters) | [C](./src/3.c) | Medium | | 4 | [Median of Two Sorted Arrays](https://leetcode.com/problems/median-of-two-sorted-arrays) | [C](./src/4.c) | Hard | | 5 | [Longest Palindromic Substring](https://leetcode.com/problems/longest-palindromic-substring) | [C](./src/5.c) | Medium | | 6 | [Zigzag Conversion](https://leetcode.com/problems/zigzag-conversion) | [C](./src/6.c) | Medium | | 7 | [Reverse Integer](https://leetcode.com/problems/reverse-integer) | [C](./src/7.c) | Medium | | 8 | [String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi) | [C](./src/8.c) | Medium | | 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number) | [C](./src/9.c) | Easy | | 10 | [Regular Expression Matching](https://leetcode.com/problems/regular-expression-matching) | [C](./src/10.c) | Hard | | 11 | [Container With Most Water](https://leetcode.com/problems/container-with-most-water) | [C](./src/11.c) | Medium | | 12 | [Integer to Roman](https://leetcode.com/problems/integer-to-roman) | [C](./src/12.c) | Medium | | 13 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer) | [C](./src/13.c) | Easy | | 14 | [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix) | [C](./src/14.c) | Easy | | 16 | [3Sum Closest](https://leetcode.com/problems/3sum-closest) | [C](./src/16.c) | Medium | | 17 | [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number) | [C](./src/17.c) | Medium | | 19 | [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list) | [C](./src/19.c) | Medium | | 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses) | [C](./src/20.c) | Easy | | 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists) | [C](./src/21.c) | Easy | | 24 | [Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs) | [C](./src/24.c) | Medium | | 26 | [Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array) | [C](./src/26.c) | Easy | | 27 | [Remove Element](https://leetcode.com/problems/remove-element) | [C](./src/27.c) | Easy | | 28 | [Find the Index of the First Occurrence in a String](https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string) | [C](./src/28.c) | Medium | | 29 | [Divide Two Integers](https://leetcode.com/problems/divide-two-integers) | [C](./src/29.c) | Medium | | 32 | [Longest Valid Parentheses](https://leetcode.com/problems/longest-valid-parentheses) | [C](./src/32.c) | Hard | | 35 | [Search Insert Position](https://leetcode.com/problems/search-insert-position) | [C](./src/35.c) | Easy | | 37 | [Sudoku Solver](https://leetcode.com/problems/sudoku-solver) | [C](./src/37.c) | Hard | | 38 | [Count and Say](https://leetcode.com/problems/count-and-say) | [C](./src/38.c) | Medium | | 42 | [Trapping Rain Water](https://leetcode.com/problems/trapping-rain-water) | [C](./src/42.c) | Hard | | 45 | [Jump Game II](https://leetcode.com/problems/jump-game-ii) | [C](./src/45.c) | Medium | | 50 | [Pow(x, n)](https://leetcode.com/problems/powx-n) | [C](./src/50.c) | Medium | | 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray) | [C](./src/53.c) | Medium | | 62 | [Unique Paths](https://leetcode.com/problems/unique-paths) | [C](./src/62.c) | Medium | | 63 | [Unique Paths II](https://leetcode.com/problems/unique-paths-ii) | [C](./src/63.c) | Medium | | 66 | [Plus One](https://leetcode.com/problems/plus-one) | [C](./src/66.c) | Easy | | 75 | [Sort Colors](https://leetcode.com/problems/sort-colors) | [C](./src/75.c) | Medium | | 79 | [Word Search](https://leetcode.com/problems/word-search) | [C](./src/79.c) | Medium | | 82 | [Remove Duplicates from Sorted List II](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii) | [C](./src/82.c) | Medium | | 83 | [Remove Duplicates from Sorted List](https://leetcode.com/problems/remove-duplicates-from-sorted-list) | [C](./src/83.c) | Easy | | 94 | [Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal) | [C](./src/94.c) | Easy | | 98 | [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree) | [C](./src/98.c) | Medium | | 101 | [Symmetric Tree](https://leetcode.com/problems/symmetric-tree) | [C](./src/101.c) | Easy | | 104 | [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree) | [C](./src/104.c) | Easy | | 108 | [Convert Sorted Array to Binary Search Tree](https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree) | [C](./src/108.c) | Easy | | 109 | [Convert Sorted List to Binary Search Tree](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree) | [C](./src/109.c) | Medium | | 110 | [Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree) | [C](./src/110.c) | Easy | | 112 | [Path Sum](https://leetcode.com/problems/path-sum) | [C](./src/112.c) | Easy | | 118 | [Pascal's Triangle](https://leetcode.com/problems/pascals-triangle) | [C](./src/118.c) | Easy | | 119 | [Pascal's Triangle II](https://leetcode.com/problems/pascals-triangle-ii) | [C](./src/119.c) | Easy | | 121 | [Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock) | [C](./src/121.c) | Easy | | 124 | [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum) | [C](./src/124.c) | Hard | | 125 | [Valid Palindrome](https://leetcode.com/problems/valid-palindrome) | [C](./src/125.c) | Easy | | 136 | [Single Number](https://leetcode.com/problems/single-number) | [C](./src/136.c) | Easy | | 141 | [Linked List Cycle](https://leetcode.com/problems/linked-list-cycle) | [C](./src/141.c) | Easy | | 142 | [Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii) | [C](./src/142.c) | Medium | | 153 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array) | [C](./src/153.c) | Medium | | 160 | [Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists) | [C](./src/160.c) | Easy | | 169 | [Majority Element](https://leetcode.com/problems/majority-element) | [C](./src/169.c) | Easy | | 173 | [Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator) | [C](./src/173.c) | Medium | | 189 | [Rotate Array](https://leetcode.com/problems/rotate-array) | [C](./src/189.c) | Medium | | 190 | [Reverse Bits](https://leetcode.com/problems/reverse-bits) | [C](./src/190.c) | Easy | | 191 | [Number of 1 Bits](https://leetcode.com/problems/number-of-1-bits) | [C](./src/191.c) | Easy | | 201 | [Bitwise AND of Numbers Range](https://leetcode.com/problems/bitwise-and-of-numbers-range) | [C](./src/201.c) | Medium | | 203 | [Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements) | [C](./src/203.c) | Easy | | 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list) | [C](./src/206.c) | Easy | | 215 | [Kth Largest Element in an Array](https://leetcode.com/problems/kth-largest-element-in-an-array) | [C](./src/215.c) | Medium | | 217 | [Contains Duplicate](https://leetcode.com/problems/contains-duplicate) | [C](./src/217.c) | Easy | | 223 | [Rectangle Area](https://leetcode.com/problems/rectangle-area) | [C](./src/223.c) | Medium | | 226 | [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree) | [C](./src/226.c) | Easy | | 230 | [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst) | [C](./src/230.c) | Medium | | 231 | [Power of Two](https://leetcode.com/problems/power-of-two) | [C](./src/231.c) | Easy | | 234 | [Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list) | [C](./src/234.c) | Easy | | 236 | [Lowest Common Ancestor of a Binary Tree](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree) | [C](./src/236.c) | Medium | | 242 | [Valid Anagram](https://leetcode.com/problems/valid-anagram) | [C](./src/242.c) | Easy | | 268 | [Missing Number](https://leetcode.com/problems/missing-number) | [C](./src/268.c) | Easy | | 274 | [H-Index](https://leetcode.com/problems/h-index) | [C](./src/274.c) | Medium | | 278 | [First Bad Version](https://leetcode.com/problems/first-bad-version) | [C](./src/278.c) | Easy | | 283 | [Move Zeroes](https://leetcode.com/problems/move-zeroes) | [C](./src/283.c) | Easy | | 287 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number) | [C](./src/287.c) | Medium | | 344 | [Reverse String](https://leetcode.com/problems/reverse-string) | [C](./src/344.c) | Easy | | 367 | [Valid Perfect Square](https://leetcode.com/problems/valid-perfect-square) | [C](./src/367.c) | Easy | | 387 | [First Unique Character in a String](https://leetcode.com/problems/first-unique-character-in-a-string) | [C](./src/387.c) | Easy | | 389 | [Find the Difference](https://leetcode.com/problems/find-the-difference) | [C](./src/389.c) | Easy | | 404 | [Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves) | [C](./src/404.c) | Easy | | 442 | [Find All Duplicates in an Array](https://leetcode.com/problems/find-all-duplicates-in-an-array) | [C](./src/442.c) | Medium | | 461 | [Hamming Distance](https://leetcode.com/problems/hamming-distance) | [C](./src/461.c) | Easy | | 476 | [Number Complement](https://leetcode.com/problems/number-complement) | [C](./src/476.c) | Easy | | 485 | [Max Consecutive Ones](https://leetcode.com/problems/max-consecutive-ones) | [C](./src/485.c) | Easy | | 509 | [Fibonacci Number](https://leetcode.com/problems/fibonacci-number) | [C](./src/509.c) | Easy | | 520 | [Detect Capital](https://leetcode.com/problems/detect-capital) | [C](./src/520.c) | Easy | | 540 | [Single Element in a Sorted Array](https://leetcode.com/problems/single-element-in-a-sorted-array) | [C](./src/540.c) | Medium | | 561 | [Array Partition](https://leetcode.com/problems/array-partition) | [C](./src/561.c) | Easy | | 567 | [Permutation in String](https://leetcode.com/problems/permutation-in-string) | [C](./src/567.c) | Medium | | 617 | [Merge Two Binary Trees](https://leetcode.com/problems/merge-two-binary-trees) | [C](./src/617.c) | Easy | | 647 | [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings) | [C](./src/647.c) | Medium | | 669 | [Trim a Binary Search Tree](https://leetcode.com/problems/trim-a-binary-search-tree) | [C](./src/669.c) | Medium | | 674 | [Longest Continuous Increasing Subsequence](https://leetcode.com/problems/longest-continuous-increasing-subsequence) | [C](./src/674.c) | Easy | | 684 | [Redundant Connection](https://leetcode.com/problems/redundant-connection) | [C](./src/684.c) | Medium | | 700 | [Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree) | [C](./src/700.c) | Easy | | 701 | [Insert into a Binary Search Tree](https://leetcode.com/problems/insert-into-a-binary-search-tree) | [C](./src/701.c) | Medium | | 704 | [Binary Search](https://leetcode.com/problems/binary-search) | [C](./src/704.c) | Easy | | 709 | [To Lower Case](https://leetcode.com/problems/to-lower-case) | [C](./src/709.c) | Easy | | 771 | [Jewels and Stones](https://leetcode.com/problems/jewels-and-stones) | [C](./src/771.c) | Easy | | 807 | [Max Increase to Keep City Skyline](https://leetcode.com/problems/max-increase-to-keep-city-skyline) | [C](./src/807.c) | Medium | | 841 | [Keys and Rooms](https://leetcode.com/problems/keys-and-rooms) | [C](./src/841.c) | Medium | | 852 | [Peak Index in a Mountain Array](https://leetcode.com/problems/peak-index-in-a-mountain-array) | [C](./src/852.c) | Medium | | 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list) | [C](./src/876.c) | Easy | | 901 | [Online Stock Span](https://leetcode.com/problems/online-stock-span) | [C](./src/901.c) | Medium | | 905 | [Sort Array By Parity](https://leetcode.com/problems/sort-array-by-parity) | [C](./src/905.c) | Easy | | 917 | [Reverse Only Letters](https://leetcode.com/problems/reverse-only-letters) | [C](./src/917.c) | Easy | | 931 | [Minimum Falling Path Sum](https://leetcode.com/problems/minimum-falling-path-sum) | [C](./src/931.c) | Medium | | 938 | [Range Sum of BST](https://leetcode.com/problems/range-sum-of-bst) | [C](./src/938.c) | Easy | | 953 | [Verifying an Alien Dictionary](https://leetcode.com/problems/verifying-an-alien-dictionary) | [C](./src/953.c) | Easy | | 965 | [Univalued Binary Tree](https://leetcode.com/problems/univalued-binary-tree) | [C](./src/965.c) | Easy | | 977 | [Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array) | [C](./src/977.c) | Easy | | 979 | [Distribute Coins in Binary Tree](https://leetcode.com/problems/distribute-coins-in-binary-tree) | [C](./src/979.c) | Medium | | 985 | [Sum of Even Numbers After Queries](https://leetcode.com/problems/sum-of-even-numbers-after-queries) | [C](./src/985.c) | Medium | | 997 | [Find the Town Judge](https://leetcode.com/problems/find-the-town-judge) | [C](./src/997.c) | Easy | | 1008 | [Construct Binary Search Tree from Preorder Traversal](https://leetcode.com/problems/construct-binary-search-tree-from-preorder-traversal) | [C](./src/1008.c) | Medium | | 1009 | [Complement of Base 10 Integer](https://leetcode.com/problems/complement-of-base-10-integer) | [C](./src/1009.c) | Easy | | 1019 | [Next Greater Node In Linked List](https://leetcode.com/problems/next-greater-node-in-linked-list) | [C](./src/1019.c) | Medium | | 1026 | [Maximum Difference Between Node and Ancestor](https://leetcode.com/problems/maximum-difference-between-node-and-ancestor) | [C](./src/1026.c) | Medium | | 1089 | [Duplicate Zeros](https://leetcode.com/problems/duplicate-zeros) | [C](./src/1089.c) | Easy | | 1137 | [N-th Tribonacci Number](https://leetcode.com/problems/n-th-tribonacci-number) | [C](./src/1137.c) | Easy | | 1147 | [Longest Chunked Palindrome Decomposition](https://leetcode.com/problems/longest-chunked-palindrome-decomposition) | [C](./src/1147.c) | Hard | | 1184 | [Distance Between Bus Stops](https://leetcode.com/problems/distance-between-bus-stops) | [C](./src/1184.c) | Easy | | 1189 | [Maximum Number of Balloons](https://leetcode.com/problems/maximum-number-of-balloons) | [C](./src/1189.c) | Easy | | 1207 | [Unique Number of Occurrences](https://leetcode.com/problems/unique-number-of-occurrences) | [C](./src/1207.c) | Easy | | 1283 | [Find the Smallest Divisor Given a Threshold](https://leetcode.com/problems/find-the-smallest-divisor-given-a-threshold) | [C](./src/1283.c) | Medium | | 1524 | [Number of Sub-arrays With Odd Sum](https://leetcode.com/problems/number-of-sub-arrays-with-odd-sum) | [C](./src/1524.c) | Medium | | 1653 | [Minimum Deletions to Make String Balanced](https://leetcode.com/problems/minimum-deletions-to-make-string-balanced) | [C](./src/1653.c) | Medium | | 1657 | [Determine if Two Strings Are Close](https://leetcode.com/problems/determine-if-two-strings-are-close) | [C](./src/1657.c) | Medium | | 1695 | [Maximum Erasure Value](https://leetcode.com/problems/maximum-erasure-value) | [C](./src/1695.c) | Medium | | 1704 | [Determine if String Halves Are Alike](https://leetcode.com/problems/determine-if-string-halves-are-alike) | [C](./src/1704.c) | Easy | | 1752 | [Check if Array Is Sorted and Rotated](https://leetcode.com/problems/check-if-array-is-sorted-and-rotated) | [C](./src/1752.c) | Easy | | 1769 | [Minimum Number of Operations to Move All Balls to Each Box](https://leetcode.com/problems/minimum-number-of-operations-to-move-all-balls-to-each-box) | [C](./src/1769.c) | Medium | | 1833 | [Maximum Ice Cream Bars](https://leetcode.com/problems/maximum-ice-cream-bars) | [C](./src/1833.c) | Medium | | 1838 | [Frequency of the Most Frequent Element](https://leetcode.com/problems/frequency-of-the-most-frequent-element) | [C](./src/1838.c) | Medium | | 2024 | [Maximize the Confusion of an Exam](https://leetcode.com/problems/maximize-the-confusion-of-an-exam) | [C](./src/2024.c) | Medium | | 2095 | [Delete the Middle Node of a Linked List](https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list) | [C](./src/2095.c) | Medium | | 2125 | [Number of Laser Beams in a Bank](https://leetcode.com/problems/number-of-laser-beams-in-a-bank) | [C](./src/2125.c) | Medium | | 2130 | [Maximum Twin Sum of a Linked List](https://leetcode.com/problems/maximum-twin-sum-of-a-linked-list) | [C](./src/2130.c) | Medium | | 2222 | [Number of Ways to Select Buildings](https://leetcode.com/problems/number-of-ways-to-select-buildings) | [C](./src/2222.c) | Medium | | 2256 | [Minimum Average Difference](https://leetcode.com/problems/minimum-average-difference) | [C](./src/2256.c) | Medium | | 2270 | [Number of Ways to Split Array](https://leetcode.com/problems/number-of-ways-to-split-array) | [C](./src/2270.c) | Medium | | 2279 | [Maximum Bags With Full Capacity of Rocks](https://leetcode.com/problems/maximum-bags-with-full-capacity-of-rocks) | [C](./src/2279.c) | Medium | | 2304 | [Minimum Path Cost in a Grid](https://leetcode.com/problems/minimum-path-cost-in-a-grid) | [C](./src/2304.c) | Medium | | 2482 | [Difference Between Ones and Zeros in Row and Column](https://leetcode.com/problems/difference-between-ones-and-zeros-in-row-and-column) | [C](./src/2482.c) | Medium | | 2501 | [Longest Square Streak in an Array](https://leetcode.com/problems/longest-square-streak-in-an-array) | [C](./src/2501.c) | Medium |