代码随想录第六十天

Leetcode 84. 柱状图中最大的矩形

题目链接: 柱状图中最大的矩形
自己的思路:没想到！！

正确思路:和接雨水类似，只是需要左右补0！！！

代码:

class Solution {
    public int largestRectangleArea(int[] height) {
        int[] heights = new int[height.length+2];
        //左右两边补0
        for (int i=0;i<height.length;i++){
            heights[i+1] = height[i];
        }
        int res = 0;
        LinkedList<Integer> st = new LinkedList<>();
        st.addFirst(0);
        for (int i =1;i<heights.length;i++){
            //找左边和右边分别比它小的数
            if (heights[i]>=heights[st.getFirst()]) st.addFirst(i);
            else{
                while(!st.isEmpty()&&heights[i]<heights[st.getFirst()]){
                    int temp = st.removeFirst();
                    int w = i-st.getFirst()-1;
                    int h = heights[temp];
                    int s = w*h;
                    res = Math.max(s,res);
                }
                st.addFirst(i);
            }
        }
        return res;
    }
}