Largest Rectangle in Histogram

 1 class Solution {
 2 public:
 3     int largestRectangleArea(vector<int> &h) {
 4    
 5     stack<int> stk;
 6     int index = 0, maxArea = 0;
 7     h.push_back(0);
 8     
 9     while(index < h.size()) {
10         
11         if(stk.empty() || h[stk.top()] <= h[index]){
12             
13             stk.push(index);
14             index++;    
15         }
16         
17         else {
18             int prev = stk.top();
19             stk.pop();
20             maxArea = max(maxArea, h[prev] * ( stk.empty() ? index :index-stk.top() - 1 ));
21         }
22     }
23     return maxArea;
24     }
25 };
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原文地址：https://www.cnblogs.com/tanghulu321/p/3074986.html