完结！撒花！

LeetCode 84.柱状图中最大的矩形

题目链接：

LeetCode 84.柱状图中最大的矩形

代码：

class Solution {
public:int largestRectangleArea(vector<int>& heights) {heights.insert(heights.begin(),0);heights.push_back(0);int size = heights.size();stack<int>st;int result = 0;st.push(0);for(int i=1;i<size;i++){if(heights[i]>=heights[st.top()]) st.push(i);else{while(!st.empty() && heights[i]<heights[st.top()]){int mid = st.top();st.pop();if(!st.empty()){int right = i;int left = st.top();int w = right - left - 1;result = max(result, w*heights[mid]);}}st.push(i);}}return result;}
};