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0for (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;}
}