Given n non-negative integers representing the histogram‘s bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.
Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3].
The largest rectangle is shown in the shaded area, which has area = 10 unit.
Example:
Input: [2,1,5,6,2,3] Output: 10
LeetCode开心刷题三十四天——84. Largest Rectangle in Histogram
原文：https://www.cnblogs.com/Marigolci/p/11347210.html