LeetCode-Java Solution # Title Solution Difficulty 6 ZigZag Conversion Java Easy 118 Pascal's Triangle Java Easy 119 Pascal's Triangle II Java Easy 168 Excel Sheet Column Title Java Easy 171 Excel Sheet Column Number Java Easy 88 Merge Sorted Array Java Easy 83 Remove Duplicates from Sorted List Java Easy 83 Climbing Stairs Java Easy 21 Merge Two Sorted Lists Java Easy 66 Plus One Java Easy 67 Add Binary Java Easy 58 Length of Last Word Java Easy 14 Longest Common Prefix Java Easy 20 Valid Parentheses Java Easy 8 String to Integer(atoi) Java Easy 9 Palindrome Number Java Easy 13 Roman to Integer Java Easy 19 Remove Nth Node From End of List Java Easy 172 Factorial Trailing Zeroes Java Easy 26 Remove Duplicates from Sorted Array Java Easy 27 Remove Element Java Easy 28 Implement strStr Java Easy 134 Gas Station Java Easy 133 Clone Graph Java Easy 129 Sum Root to Leaf Numbers Java Medium 1 Two Sum Java Medium 219 Contains Duplicate II Java Easy 189 Rotate Array II Java Easy 121 Best Time to Buy and Sell Stock Java Easy 283 Move Zeroes Java Easy 217 Contains Duplicate Java Easy 209 Minimum Size Subarray Sum Java Medium 15 3Sum Java Medium 73 Set Matrix Zeroes Java Medium 216 Combination Sum III Java Medium 18 4Sum Java Medium 162 Find Peak Element Java Medium 152 Maximum Product Subarray Java Medium 268 Missing Number Java Medium 122 Best Time to Buy and Sell Stock II Java Medium 120 Triangle Java Medium 34 Search for a range Java Medium 35 Search Insert Position Java Medium 106 Construct Binary Tree from Inorder and Postorder Traversal Java Medium 105 Construct Binary Tree from Preorder and Inorder Traversal Java Medium 90 Subsets II Java Medium 39 Combination Sum Java Medium 11 Container With Most Water Java Medium 81 Search in Rotated Sorted Array II Java Medium 80 Remove Duplicates from Sorted Array II Java Medium 75 Sort Colors Java Medium 74 Search a 2D Matrix Java Medium 40 Combination Sum II Java Medium 64 Minimum Path Sum Java Medium 62 Unique Paths Java Medium 63 Unique Paths II Java Medium 59 Spiral Matrix II Java Medium 238 Product of Array Except Self Java Medium 229 Majority Element II Java Medium 55 Jump Game Java Medium 54 Spiral Matrix Java Medium 53 Maximum Subarray Java Medium 48 Rotate Image Java Medium 228 Summary Ranges Java Medium 16 3Sum Closest Java Medium 42 Trapping Rain Water Java Hard 56 Merge Intervals Java Hard 205 Isomorphic Strings Java Easy 204 Count Primes Java Easy 202 Happy Numbers Java Easy 299 Bulls and Cows Java Easy