Unofficial Solutions to the problems by LeetCode

Welcome LeetCode! I will do the Codility and LeetCode in parallel.

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• Two Sum: Python solution
• Median of Two Sorted Arrays: Python solution
• Longest Substring Without Repeating Characters: Python solution
• Add Two Numbers: Python solution
• Longest Palindromic Substring: Python solution
• ZigZag Conversion: Python solution
• Reverse Integer: Python solution
• String to Integer (atoi): Python solution
• Palindrome Number: Python solution
• Container With Most Water: Python solution
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• Regular Expression Matching: Python solution
• Roman to Integer: Python solution
• Integer to Roman: Python solution
• 3Sum: Python solution
• Longest Common Prefix: Python solution
• 3Sum Closest: Python solution
• Letter Combinations of a Phone Number: Python solution
• 4Sum: Python solution
• Remove Nth Node From End of List: Python solution
• Valid Parentheses: Python solution
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• Generate Parentheses: Python solution
• Merge k Sorted Lists: Python solution
• Swap Nodes in Pairs: Python solution
• Reverse Nodes in k-Group: Python solution
• Remove Element: Python solution
• Remove Duplicates from Sorted Array: Python solution
• Divide Two Integers: Python solution
• Implement strStr(): Python solution
• Substring with Concatenation of All Words: Python solution
• Next Permutation: Python solution
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• Longest Valid Parentheses: Python solution
• Search for a Range: Python solution
• Search in Rotated Sorted Array: Python solution
• Valid Sudoku: Python solution
• Search Insert Position: Python solution
• Sudoku Solver: Python solution
• Count and Say: Python solution
• Combination Sum: Python solution
• Combination Sum II: Python solution
• First Missing Positive: Python solution
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• Trapping Rain Water: Python solution
• Multiply Strings: Python solution
• Wildcard Matching: Python solution
• Permutations: Python solution
• Permutations II: Python solution
• Jump Game II: Python solution
• Rotate Image: Python solution
• N-Queens: Python solution
• Pow(x, n): Python solution
• Anagrams: Python solution
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• N-Queens II: Python solution
• Maximum Subarray: Python solution
• Jump Game: Python solution
• Spiral Matrix: Python solution
• Merge Intervals: Python solution
• Rotate List: Python solution
• Permutation Sequence: Python solution
• Spiral Matrix II: Python solution
• Length of Last Word: Python solution
• Insert Interval: Python solution
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• Minimum Path Sum: Python solution
• Unique Paths: Python solution
• Unique Paths II: Python solution
• Merge Two Sorted Lists: Python solution
• Plus One: Python solution
• Valid Number: Python solution
• Add Binary: Python solution
• Simplify Path: Python solution
• Climbing Stairs: Python solution
• Sqrt(x): Python solution
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• Text Justification: Python solution
• Edit Distance: Python solution
• Set Matrix Zeroes: Python solution
• Search a 2D Matrix: Python solution
• Sort Colors: Python solution
• Minimum Window Substring: Python solution
• Word Search: Python solution
• Subsets: Python solution
• Combinations: Python solution
• Search in Rotated Sorted Array II: Python solution
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• Remove Duplicates from Sorted Array II: Python solution
• Remove Duplicates from Sorted List: Python solution
• Remove Duplicates from Sorted List II: Python solution
• Largest Rectangle in Histogram: Python solution
• Maximal Rectangle: Python solution
• Scramble String: Python solution
• Partition List: Python solution
• Gray Code: Python solution
• Merge Sorted Array: Python solution
• Subsets II: Python solution
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• Decode Ways: Python solution
• Reverse Linked List II: Python solution
• Restore IP Addresses: Python solution
• Unique Binary Search Trees: Python solution
• Unique Binary Search Trees II: Python solution
• Binary Tree Inorder Traversal: Python solution
• Interleaving String: Python solution
• Validate Binary Search Tree: Python solution
• Recover Binary Search Tree: Python solution
• Same Tree: Python solution: Python solution
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• Symmetric Tree: Python solution
• Binary Tree Zigzag Level Order Traversal: Python solution
• Binary Tree Level Order Traversal: Python solution
• Maximum Depth of Binary Tree: Python solution
• Construct Binary Tree from Inorder and Postorder Traversal: Python solution
• Construct Binary Tree from Preorder and Inorder Traversal: Python solution
• Binary Tree Level Order Traversal II: Python solution
• Convert Sorted List to Binary Search Tree: Python solution
• Convert Sorted Array to Binary Search Tree: Python solution
• Balanced Binary Tree: Python solution
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• Minimum Depth of Binary Tree: Python solution
• Path Sum: Python solution
• Path Sum II: Python solution
• Flatten Binary Tree to Linked List: Python solution
• Distinct Subsequences*: Python solution
• Pascal’s Triangle: Python solution
• Pascal’s Triangle II: Python solution
• Populating Next Right Pointers in Each Node: Python solution
• Populating Next Right Pointers in Each Node II: Python solution
• Triangle: Python solution
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• Best Time to Buy and Sell Stock: Python solution
• Best Time to Buy and Sell Stock II: Python solution
• Best Time to Buy and Sell Stock III: Python solution
• Binary Tree Maximum Path Sum: Python solution
• Valid Palindrome: Python solution
• Word Ladder: Python solution
• Word Ladder II: Python solution
• Longest Consecutive Sequence: Python solution
• Sum Root to Leaf Numbers: Python solution
• Surrounded Regions: Python solution
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• Palindrome Partitioning: Python solution
• Palindrome Partitioning II: Python solution
• Clone Graph: Python solution
• Gas Station: Python solution
• Candy: Python solution
• Single Number: Python solution
• Single Number II: Python solution
• Copy List with Random Pointer: Python solution
• Word Break: Python solution
• Word Break II: Python solution
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• Linked List Cycle: Python solution
• Linked List Cycle II: Python solution
• Reorder List: Python solution
• Binary Tree Preorder Traversal: Python solution
• Binary Tree Postorder Traversal: Python solution
• LRU Cache: Python solution
• Insertion Sort List: Python solution
• Sort List: Python solution
• Max Points on a Line: Python solution
• Evaluate Reverse Polish Notation: Python solution
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• Reverse Words in a String: Python solution C++ solution
• Maximum Product Subarray: Python solution
• Find Minimum in Rotated Sorted Array: Python solution
• Find Minimum in Rotated Sorted Array II: Python solution
• Min Stack: Python solution
• Binary Tree Upside Down: Inaccessible
• Read N Characters Given Read4: Inaccessible
• Read N Characters Given Read4 II – Call multiple times: Inaccessible
• Longest Substring with At Most Two Distinct Characters: Inaccessible
• Intersection of Two Linked Lists: Python solution
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• One Edit Distance: Inaccessible
• Find Peak Element: Python solution
• Missing Ranges: Inaccessible
• Maximum Gap: Python solution
• Compare Version Numbers: Python solution
• Fraction to Recurring Decimal: Python solution
• Two Sum II – Input array is sorted: Inaccessible
• Excel Sheet Column Title: Python solution
• Majority Element: Python solution
• Two Sum III – Data structure design: Inaccessible
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• Excel Sheet Column Number: Python solution
• Factorial Trailing Zeroes: Python solution
• Binary Search Tree Iterator: Python solution
• Dungeon Game: Python solution
• Largest Number: Python solution
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• Reverse Words in a String II: Inaccessible
• Repeated DNA Sequences: Python solution
• Best Time to Buy and Sell Stock IV: Python solution
• Rotate Array: Python solution
• Reverse Bits: Python solution
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• Number of 1 Bits: Python solution
• House Robber: Python solution
• Binary Tree Right Side View: Python solution
• Number of Islands: Python solution
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• Bitwise AND of Numbers Range: Python solution
• Happy Number: Python solution
• Remove Linked List Elements: Python solution
• Count Primes: Python solution
• Isomorphic Strings: Python solution
• Reverse Linked List: Python solution
• Course Schedule: Python solution
• Implement Trie (Prefix Tree): Python solution
• Minimum Size Subarray Sum: Python solution
• Course Schedule II: Python solution
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