# LeetCode 70. Climbing Stairs

Description https://leetcode.com/problems/climbing-stairs/ You are climbing a stair case. It takes n steps to reach to the top. Each time you can either…

# 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 84. Largest Rectangle in Histogram

Description https://leetcode.com/problems/largest-rectangle-in-histogram/description/ Given n non-negative integers representing the histogram’s bar height where the width of each bar is 1, find the area…

# LeetCode 139. Word Break

Description https://leetcode.com/problems/word-break/description/ Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequence of one or…

# 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…