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Trapping Rain Water LeetCode Solution

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Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.

Longest Valid Parentheses LeetCode Solution

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Given a string containing just the characters ‘(‘ and ‘)’, return the length of the longest valid (well-formed) parentheses substring.

Largest Rectangle in Histogram LeetCode Solution

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Given an array of integers heights representing the histogram’s bar height where the width of each bar is 1, return the area of the largest rectangle in the histogram.

Valid Parentheses LeetCode Solution

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Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.