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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.

order red, white, and blue.

我昔东海上，劳山餐紫霞。

You are climbing a staircase.

config.

There is a robot on an `m x n` grid.

君子战虽有陈，而勇为本焉；丧虽有礼，而哀为本焉；士虽有学，而行为本焉。

Given an array of `intervals` where `intervals[i] = [starti, endi]`, merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.