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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.
For example,
Given heights = [2,1,5,6,2,3],
return 10.
class Solution { public: int largestRectangleArea(vector<int>& heights) { stack<int> s; int res = 0; heights.push_back(0); for(int i=0;i<heights.size();){ if(s.empty() || heights[i] > heights[s.top()]){ s.push(i++); }else{ int tmp = s.top(); s.pop(); if(s.empty()){ res = max(res,heights[tmp]*i); }else{ res = max(res,heights[tmp]*(i-s.top()-1)); } } } return res; } };
Largest Rectangle in Histogram
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原文地址：http://www.cnblogs.com/wxquare/p/5929822.html
