# LeetCode 387. First Unique Character in a String

Description https://leetcode.com/problems/first-unique-character-in-a-string/description/ Given a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist,…

# LeetCode 102. Binary Tree Level Order Traversal

Description https://leetcode.com/problems/binary-tree-level-order-traversal/description/ Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by…

# LeetCode 104. Maximum Depth of Binary Tree

Description https://leetcode.com/problems/maximum-depth-of-binary-tree/description/ Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the…

# LeetCode 42. Trapping Rain Water

Description https://leetcode.com/problems/trapping-rain-water/description/ Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water…

# LeetCode 69. Sqrt(x) (Java)

Description https://leetcode.com/problems/sqrtx/description/ Implement int sqrt(int x). Compute and return the square root of x. x is guaranteed to be a non-negative integer. Example…