# LeetCode 189. Rotate Array

Description https://leetcode.com/problems/rotate-array/ Given an array, rotate the array to the right by k steps, where k is non-negative. Example 1: Input: [1,2,3,4,5,6,7] and k…

# LeetCode 217. Contains Duplicate

Description https://leetcode.com/problems/contains-duplicate/ Given an array of integers, find if the array contains any duplicates. Your function should return true if…

# LeetCode 66. Plus One

Description https://leetcode.com/problems/plus-one/ You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. The digits are…

# LeetCode 344. Reverse String

Description https://leetcode.com/problems/reverse-string/ Write a function that reverses a string. The input string is given as an array of characters char[]. Do…

# LeetCode 53. Maximum Subarray

Description https://leetcode.com/problems/maximum-subarray/ Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum…

# LeetCode 20. Valid Parentheses

Description https://leetcode.com/problems/valid-parentheses/ Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid. An input string is valid…

# LeetCode 1. Two Sum

Description https://leetcode.com/problems/two-sum/ Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.…

# LeetCode 2. Add Two Numbers

Description https://leetcode.com/problems/add-two-numbers/ You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of…