还未完成 Leetcode 84. Largest Rectangle in Histogram

原题地址

https://leetcode.com/problems/largest-rectangle-in-histogram/description/

题意

给出一个vector表示直方图，找出直方图里最大的矩形，返回其面积。

代码

一开始用了最粗暴的O（N^2）的解法

class Solution {
public:
    int largestRectangleArea(vector& heights) {
        int col = heights.size();
        if (col == 0) return 0;
        int area = 0;
        vector > dp(col, vector(col, 0));
        for (int i = 0; i < col; i++) {
            int lowest = heights[i];
            for (int j = 0; j <= i; j++) {
                if(heights[i-j]area){
                    area=dp[i][j];
                }
            }
        }
        return area;
    }
};

果然超时了