├── .gitignore ├── LICENSE ├── README.md ├── TAG.md ├── java ├── _001TwoSum.java ├── _002AddTwoNumbers.java ├── _003LongestSubStringWithoutRepeatingCharacters.java ├── _004MedianOfTwoSortedArrays.java ├── _007ReverseInteger.java ├── _009PalindromeNumber.java ├── _013RomanToInteger.java ├── _0184Sum.java ├── _019RemoveNthNodeFromEndOfList.java ├── _020ValidParentheses.java ├── _021MergeTwoSortedLists.java ├── _023MergeKSortedLists.java ├── _024SwapNodesInPairs.java ├── _025ReverseNodesInKGroup.java ├── _042TrappingRainWater.java ├── _071SimplifyPath.java ├── _094BinaryTreeInorderTraversal.java ├── _095UniqueBinarySearchTreesII.java ├── _096UniqueBinarySearchTrees.java ├── _098ValidateBinarySearchTree.java ├── _099RecoverBinarySearchTree.java ├── _100SameTree.java ├── _101SymmetricTree.java ├── _102BinaryTreeLevelOrderTraversal.java ├── _103BinaryTreeZigzagLevelOrderTraversal.java ├── _144BinaryTreePreorderTraversal.java ├── _145BinaryTreePostorderTraversal.java ├── _150EvaluateReversePolishNotation.java ├── _155MinStack.java ├── _173BinarySearchTreeIterator.java ├── _215KthLargestElementInAnArray.java ├── _224BasicCalculator.java ├── _225ImplementStackUsingQueues.java ├── _232ImplementQueueUsingStacks.java ├── _239SlidingWindowMaximum.java ├── _257BinaryTreePaths.java ├── _258AddDigits.java ├── _260SingleNumberIII.java ├── _264UglyNumberII.java ├── _273IntegertoEnglishWords.java ├── _274H_Index.java ├── _283MoveZeroes.java ├── _292NimGame.java ├── _295FindMedianFromDataStream.java ├── _299BullsandCows.java ├── _313SuperUglyNumber.java ├── _316RemoveDuplicateLetters.java ├── _331VerifyPreorderSerializationOfABinaryTree.java ├── _341FlattenNestedListIterator.java ├── _347TopKFrequentElements.java ├── _385MiniParser.java ├── _387FirstUniqueCharacterinaString.java ├── _394DecodeString.java ├── _402RemoveKDigits.java ├── _456132Pattern.java └── _496NextGreaterElementI.java └── python ├── 001 Two Sum.py ├── 002 Add Two Numbers.py ├── 003 Longest Substring Without Repeating Characters.py ├── 004 Median of Two Sorted Arrays.py ├── 005 Longest Palindromic Substring.py ├── 006 ZigZag Conversion.py ├── 007 Reverse Integer.py ├── 008 String to Integer.py ├── 009 Palindrome Number.py ├── 010 Regular Expression Matching.py ├── 011 Container With Most Water.py ├── 012 Integer to Roman.py ├── 013 Roman to Integer.py ├── 014 Longest Common Prefix.py ├── 015 3Sum.py ├── 016 3Sum Closest.py ├── 017 Letter Combinations of a Phone Number.py ├── 018 4Sum.py ├── 019 Remove Nth Node From End of List.py ├── 020 Valid Parentheses.py ├── 021 Merge Two Sorted Lists.py ├── 022 Generate Parentheses.py ├── 023 Merge k Sorted Lists.py ├── 024 Swap Nodes in Pairs.py ├── 025 Reverse Nodes in k-Group.py ├── 026 Remove Duplicates from Sorted Array.py ├── 027 Remove Element.py ├── 028 Implement strStr().py ├── 029 Divide Two Integers.py ├── 030 Substring with Concatenation of All Words.py ├── 031 Next Permutation.py ├── 032 Longest Valid Parentheses.py ├── 033 Search in Rotated Sorted Array.py ├── 034 Search for a Range.py ├── 035 Search Insert Position.py ├── 036 Valid Sudoku.py ├── 037 Sudoku Solver.py ├── 038 Count and Say.py ├── 039 Combination Sum.py ├── 040 Combination Sum II.py ├── 041 First Missing Positive.py ├── 042 Trapping Rain Water.py ├── 043 Multiply Strings.py ├── 044 Wildcard Matching.py ├── 045 Jump Game II.py ├── 046 Permutations.py ├── 047 Permutations II.py ├── 048 Rotate Image.py ├── 049 Group Anagrams.py ├── 050 Pow(x, n).py ├── 051 N-Queens.py ├── 052 N-Queens II.py ├── 053 Maximum Subarray.py ├── 054 Spiral Matrix.py ├── 055 Jump Game.py ├── 056 Merge Intervals.py ├── 057 Insert Interval.py ├── 058 Length of Last Word.py ├── 059 Spiral Matrix II.py ├── 060 Permutation Sequence.py ├── 061 Rotate List.py ├── 062 Unique Paths.py ├── 063 Unique Paths II.py ├── 064 Minimum Path Sum.py ├── 065 Valid Number.py ├── 066 Plus One.py ├── 067 Add Binary.py ├── 068 Text Justification.py ├── 069 Sqrt(x).py ├── 070 Climbing Stairs.py ├── 071 Simplify Path.py ├── 072 Edit Distance.py ├── 073 Set Matrix Zeroes.py ├── 074 Search a 2D Matrix.py ├── 075 Sort Colors.py ├── 076 Minimum Window Substring.py ├── 077 Combinations.py ├── 078 Subsets.py ├── 079 Word Search.py ├── 080 Remove Duplicates from Sorted Array II.py ├── 081 Search in Rotated Sorted Array II.py ├── 082 Remove Duplicates from Sorted List II.py ├── 083 Remove Duplicates from Sorted List.py ├── 084 Largest Rectangle in Histogram.py ├── 085 Maximal Rectangle.py ├── 086 Partition List.py ├── 087 Scramble String.py ├── 088 Merge Sorted Array.py ├── 089 Gray Code.py ├── 090 Subsets II.py ├── 091 Decode Ways.py ├── 092 Reverse Linked List II.py ├── 093 Restore IP Addresses.py ├── 094 Binary Tree Inorder Traversal.py ├── 095 Unique Binary Search Trees II.py ├── 096 Unique Binary Search Trees.py ├── 097 Interleaving String.py ├── 098 Validate Binary Search Tree.py ├── 099 Recover Binary Search Tree.py ├── 100 Same Tree.py ├── 101 Symmetric Tree.py ├── 102 Binary Tree Level Order Traversal.py ├── 103 Binary Tree Zigzag Level Order Traversal.py ├── 104 Maximum Depth of Binary Tree.py ├── 105 Construct Binary Tree from Preorder and Inorder Traversal.py ├── 106 Construct Binary Tree from Inorder and Postorder Traversal.py ├── 107 Binary Tree Level Order Traversal II.py ├── 108 Convert Sorted Array to Binary Search Tree.py ├── 109 Convert Sorted List to Binary Search Tree.py ├── 110 Balanced Binary Tree.py ├── 111 Minimum Depth of Binary Tree.py ├── 112 Path Sum.py ├── 113 Path Sum II.py ├── 114 Flatten Binary Tree to Linked List.py ├── 115 Distinct Subsequences.py ├── 116 Populating Next Right Pointers in Each Node.py ├── 117 Populating Next Right Pointers in Each Node II.py ├── 118 Pascal's Triangle.py ├── 119 Pascal's Triangle II.py ├── 120 Triangle.py ├── 121 Best Time to Buy and Sell Stock.py ├── 122 Best Time to Buy and Sell Stock II.py ├── 123 Best Time to Buy and Sell Stock III.py ├── 124 Binary Tree Maximum Path Sum.py ├── 125 Valid Palindrome.py ├── 126 Word Ladder II.py ├── 127 Word Ladder.py ├── 128 Longest Consecutive Sequence.py ├── 129 Sum Root to Leaf Numbers.py ├── 130 Surrounded Regions.py ├── 131 Palindrome Partitioning.py ├── 132 Palindrome Partitioning II.py ├── 133 Clone Graph.py ├── 134 Gas Station.py ├── 135 Candy.py ├── 136 Single Number.py ├── 137 Single Number II.py ├── 138 Copy List with Random Pointer.py ├── 139 Word Break.py ├── 140 Word Break II.py ├── 141 Linked List Cycle.py ├── 142 Linked List Cycle II.py ├── 143 Reorder List.py ├── 144 Binary Tree Preorder Traversal.py ├── 145 Binary Tree Postorder Traversal.py ├── 146 LRU Cache.py ├── 147 Insertion Sort List.py ├── 149 Max Points on a Line.py ├── 150 Evaluate Reverse Polish Notation.py ├── 151 Reverse Words in a String.py ├── 152 Maximum Product Subarray.py ├── 153 Find Minimum in Rotated Sorted Array.py ├── 155 Min Stack.py ├── 160 Intersection of Two Linked Lists.py ├── 162 Find Peak Element.py ├── 164 Maximum Gap.py ├── 165 Compare Version Numbers.py ├── 166 Fraction to Recurring Decimal.py ├── 168 Excel Sheet Column Title.py ├── 169 Majority Element.py ├── 171 Excel Sheet Column Number.py ├── 172 Factorial Trailing Zeroes.py ├── 173 Binary Search Tree Iterator.py ├── 174 Dungeon Game.py ├── 179 Largest Number.py ├── 189 Rotate Array.py ├── 190 Reverse Bits.py ├── 191 Number of 1 Bits.py ├── 198 House Robber.py ├── 199 Binary Tree Right Side View.py ├── 200 Number of Islands.py ├── 201 Bitwise AND of Numbers Range.py ├── 202 Happy Number.py ├── 203 Remove Linked List Elements.py ├── 204 Count Primes.py ├── 205 Isomorphic Strings.py ├── 206 Reverse Linked List.py ├── 207 Course Schedule.py ├── 217 Contains Duplicate.py ├── 219 Contains Duplicate II.py ├── 233 Number of Digit One.py ├── 234 Palindrome Linked List.py ├── 237 Delete Node in a Linked List.py ├── 238 Product of Array Except Self.py └── 242 Valid Anagram.py /.gitignore: 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