![](\"https://assets.leetcode.com/uploads/2021/01/04/histogram.jpg\")
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.
\n
Example 1:
\n\n\nInput: heights = [2,1,5,6,2,3]\nOutput: 10\nExplanation: The above is a histogram where width of each bar is 1.\nThe largest rectangle is shown in the red area, which has an area = 10 units.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/01/04/histogram-1.jpg\")
\n\nInput: heights = [2,4]\nOutput: 4\n\n\n
\n
Constraints:
\n\n1 <= heights.length <= 1050 <= heights[i] <= 104给定 n 个非负整数，用来表示柱状图中各个柱子的高度。每个柱子彼此相邻，且宽度为 1 。
\n\n求在该柱状图中，能够勾勒出来的矩形的最大面积。
\n\n\n\n
示例 1:
\n\n
\n输入：heights = [2,1,5,6,2,3]\n输出：10\n解释：最大的矩形为图中红色区域，面积为 10\n\n\n
示例 2：
\n\n
\n输入： heights = [2,4]\n输出： 4\n\n
\n\n
提示：
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