Largest Rectangle in Histogram

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.

Largest Rectangle in Histogram: Example 1

Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3].

Largest Rectangle in Histogram: Example 2

The largest rectangle is shown in the shaded area, which has area = 10 unit.

For example,
Given height = [2,1,5,6,2,3],
return 10.

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