leetcode-solutions This is a repository with my solutions to problems from www.leetcode.com. Problems # Title Solution Difficulty 1 Decode XORed Array Solution EASY 2 Count Operations to Obtain Zero Solution EASY 3 Best Time to Buy and Sell Stock Solution EASY 4 Print in Order Solution EASY 5 Print in Order SolutionV3 EASY 6 Print in Order SolutionV2 EASY 7 Palindrome Number Solution EASY 8 Sum of Two Integers Solution EASY 9 Number of Even and Odd Bits Solution EASY 10 Pascals Triangle Solution EASY 11 Number of Steps to Reduce a Number to Zero Solution EASY 12 Buy Two Chocolates Solution EASY 13 Two Sum Solution EASY 14 Binary Tree Postorder Traversal Solution EASY 15 Squares of a Sorted Array Solution EASY 16 Remove Letter To Equalize Frequency Solution EASY 17 Plus One Solution EASY 18 Counter Solution.js EASY 19 Isomorphic Strings Solution EASY 20 Search Insert Position Solution EASY 21 Add Digits Solution EASY 22 Sqrt(x) Solution EASY 23 Length of Last Word Solution EASY 24 Island Perimeter Solution EASY 25 Island Perimeter SolutionV2 EASY 26 Add Binary Solution EASY 27 Binary Tree Inorder Traversal Solution EASY 28 Implement Queue using Stacks Solution EASY 29 Nim Game Solution EASY 30 Find the Pivot Integer Solution EASY 31 Minimum Bit Flips to Convert Number Solution EASY 32 Missing Number Solution EASY 33 Missing Number SolutionV2 EASY 34 Valid Parentheses Solution EASY 35 Backspace String Compare Solution EASY 36 Backspace String Compare SolutionV2 EASY 37 Remove Element Solution EASY 38 Furthest Point From Origin Solution EASY 39 Add Strings Solution EASY 40 Running Sum of 1d Array Solution EASY 41 Fizz Buzz Solution EASY 42 Valid Palindrome II Solution EASY 43 Contains Duplicate II Solution EASY 44 Contains Duplicate II SolutionV2 EASY 45 Implement strStr() Solution EASY 46 Implement strStr() SolutionV2 EASY 47 Average Value of Even Numbers That Are Divisible by Three Solution EASY 48 Valid Anagram Solution EASY 49 Remove Duplicates from Sorted Array Solution EASY 50 Reverse Prefix of Word Solution EASY 51 Merge Two Sorted Lists Solution EASY 52 Maximum Average Subarray I Solution EASY 53 Maximum Average Subarray I SolutionV2 EASY 54 Number Complement Solution EASY 55 Merge Sorted Array Solution EASY 56 Crawler Log Folder Solution EASY 57 Majority Element Solution EASY 58 Majority Element SolutionV2 EASY 59 Merge Strings Alternately Solution EASY 60 A Number After a Double Reversal Solution EASY 61 Reverse Words in a String III Solution EASY 62 Reverse Words in a String III SolutionV2 EASY 63 Sort Integers by The Number of 1 Bits Solution EASY 64 Excel Sheet Column Title Solution EASY 65 Design HashMap Solution EASY 66 Sum of Squares of Special Elements Solution EASY 67 Maximum Depth of Binary Tree Solution EASY 68 Maximum Length Substring With Two Occurrences Solution EASY 69 Counting Bits Solution EASY 70 Counting Bits SolutionV2 EASY 71 Find First Palindromic String in the Array Solution EASY 72 Reverse String Solution EASY 73 Excel Sheet Column Number Solution EASY 74 Valid Palindrome Solution EASY 75 Reverse String II Solution EASY 76 Reverse String II SolutionV2 EASY 77 First Letter to Appear Twice Solution EASY 78 Linked List Cycle Solution EASY 79 UNKNOWN Solution EASY 80 Divide a String Into Groups of Size k Solution EASY 81 Power of Four Solution EASY 82 Find the Difference Solution EASY 83 Find Smallest Letter Greater Than Target Solution EASY 84 Find Smallest Letter Greater Than Target SolutionV2 EASY 85 Path Sum Solution EASY 86 Word Pattern Solution EASY 87 Hamming Distance Solution EASY 88 Hamming Distance SolutionV3 EASY 89 Hamming Distance SolutionV2 EASY 90 Construct the Rectangle Solution EASY 91 Reverse Linked List Solution EASY 92 Positions of Large Groups Solution EASY 93 Positions of Large Groups SolutionV2 EASY 94 Number of Segments in a String Solution EASY 95 Complement of Base 10 Integer Solution EASY 96 Reformat Phone Number Solution EASY 97 Number of Unequal Triplets in Array Solution EASY 98 Check if Numbers Are Ascending in a Sentence Solution EASY 99 Power of Two Solution EASY 100 Power of Two SolutionV2 EASY 101 Check if Number Has Equal Digit Count and Digit Value Solution EASY 102 Most Frequent Even Element Solution EASY 103 Remove Duplicates from Sorted List Solution EASY 104 Implement Stack using Queues Solution EASY 105 First Bad Version Solution EASY 106 Counter II Solution.js EASY 107 Baseball Game Solution EASY 108 Roman to Integer Solution EASY 109 Convert the Temperature Solution EASY 110 Longest Common Prefix Solution EASY 111 Move Zeroes Solution EASY 112 Symmetric Tree Solution EASY 113 Min Stack Solution EASY 114 Min Stack SolutionV2 EASY 115 Fibonacci Number Solution EASY 116 Binary Search Solution EASY 117 Rearrange Spaces Between Words Solution EASY 118 Reverse Bits Solution EASY 119 Same Tree Solution EASY 120 Range Sum Query - Immutable Solution EASY 121 Single Number Solution EASY 122 Single Number SolutionV2 EASY 123 Count Good Triplets Solution EASY 124 Check if All As Appears Before All Bs Solution EASY 125 Number of 1 Bits Solution EASY 126 Design HashSet Solution EASY 127 Is Subsequence Solution EASY 128 Text Justification Solution HARD 129 Design Skiplist Solution HARD 130 Valid Number Solution HARD 131 LFU Cache Solution HARD 132 Design a Text Editor Solution HARD 133 Reverse Integer Solution MEDIUM 134 UNKNOWN Solution MEDIUM 135 Validate Stack Sequences Solution MEDIUM 136 Zigzag Conversion Solution MEDIUM 137 Flatten Nested List Iterator Solution MEDIUM 138 Binary Search Tree Iterator Solution MEDIUM 139 String to Integer (atoi) Solution MEDIUM 140 Print FooBar Alternately Solution MEDIUM 141 Rotate List Solution MEDIUM 142 Spiral Matrix II Solution MEDIUM 143 Spiral Matrix II SolutionV2 MEDIUM 144 UNKNOWN Solution MEDIUM 145 Single Number III Solution MEDIUM 146 Score of Parentheses Solution MEDIUM 147 Container With Most Water Solution MEDIUM 148 Max Number of K-Sum Pairs Solution MEDIUM 149 Minimum Remove to Make Valid Parentheses Solution MEDIUM 150 Jump Game II Solution MEDIUM 151 K Radius Subarray Averages Solution MEDIUM 152 Search a 2D Matrix Solution MEDIUM 153 Search a 2D Matrix SolutionV2 MEDIUM 154 Remove Nth Node From End of List Solution MEDIUM 155 H-Index Solution MEDIUM 156 Find the Duplicate Number Solution MEDIUM 157 Majority Element II Solution MEDIUM 158 Encode and Decode TinyURL Solution MEDIUM 159 Maximum Depth of N-ary Tree Solution MEDIUM 160 Evaluate Reverse Polish Notation Solution MEDIUM 161 Building H2O Solution MEDIUM 162 Longest Substring Without Repeating Characters Solution MEDIUM 163 Longest Substring Without Repeating Characters SolutionV2 MEDIUM 164 Flatten Binary Tree to Linked List Solution MEDIUM 165 Add Two Numbers Solution MEDIUM 166 LRU Cache Solution MEDIUM 167 Print Zero Even Odd Solution MEDIUM 168 Unique Paths Solution MEDIUM 169 Spiral Matrix SolutionV2 MEDIUM 170 Append Characters to String to Make Subsequence Solution MEDIUM 171 Number of Islands Solution MEDIUM 172 Jump Game Solution MEDIUM 173 Unique Paths II Solution MEDIUM 174 Minimum Path Sum Solution MEDIUM 175 Map Sum Pairs Solution MEDIUM 176 Rotate Image Solution MEDIUM 177 Swap Nodes in Pairs Solution MEDIUM 178 Integer to Roman Solution MEDIUM 179 Simplify Path Solution MEDIUM 180 Remove Duplicates from Sorted List II Solution MEDIUM 181 Find The Original Array of Prefix Xor Solution MEDIUM 182 Peeking Iterator Solution MEDIUM 183 Peeking Iterator SolutionV2 MEDIUM 184 Number of Matching Subsequences Solution MEDIUM 185 UTF-8 Validation Solution MEDIUM 186 Jump Game III Solution MEDIUM 187 Fizz Buzz Multithreaded Solution MEDIUM 188 Range Sum Query 2D - Immutable Solution MEDIUM 189 House Robber Solution MEDIUM 190 House Robber SolutionV2 MEDIUM
