#84

Largest Rectangle in Histogram

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Description

Array heights represents a histogram where every bar has width 1. Return the area of the largest rectangle that fits entirely within the histogram.

Example 1:

Input: heights = [2,1,5,6,2,3]
Output: 10
Explanation: The above is a histogram where width of each bar is 1.
The largest rectangle is shown in the red area, which has an area = 10 units.

Example 2:

Input: heights = [2,4]
Output: 4

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