Code of LeetCode README.md # Problem Solution 146 LRU Cache C# 65 Valid Number C# 19 Remove Nth Node From End of List C# 203 Remove Linked List Elements C# 237 Delete Node in a Linked List C# 21 Merge Two Sorted Lists C# 201 Bitwise AND of Numbers Range C# 71 Simplify Path C# 225 Implement Stack using Queues C# 232 Implement Queue using Stacks C# 2 Add Two Numbers C# 263 Ugly Number C# 20 Valid Parentheses C# 27 Remove Element C# 283 Move Zeroes C# 227 Basic Calculator II C# 224 Basic Calculator C# 150 Evaluate Reverse Polish Notation C# 188 Best Time to Buy and Sell Stock IV C# 123 Best Time to Buy and Sell Stock III C# 122 Best Time to Buy and Sell Stock II C# 121 Best Time to Buy and Sell Stock C# 1 Two Sum C# 18 4Sum C# 15 3Sum C# 16 3Sum Closest C# 151 Reverse Words in a String C# 74 Search a 2D Matrix C# 240 Search a 2D Matrix II C# 153 Find Minimum in Rotated Sorted Array C# 61 Rotate List C# 48 Rotate Image C# 70 Climbing Stairs C++ 89 Gray Code C++ 33 Search for a Range C# 191 Number of 1 Bits C# 69 Sqrt(x) C++ 50 Pow(x, n) C++ 78 Subsets C++ 38 Count and Say C# 67 Add Binary C++ 43 Multiply Strings C++ 35 Search Insert Position C++ 168 Excel Sheet Column Title C++ 171 Excel Sheet Column Number C++ 26 Remove Duplicates from Sorted Array C++ 9 Palindrome Number Java 7 Reverse Integer Java 33 Search in Rotated Sorted Array Java 12 Integer to Roman Java