最大矩形

class Solution {    public int maximalRectangle(char[][] matrix) {        int m = matrix.length;        if(m==0){            return 0;        }        int n = matrix[0].length;        if(n==0){            return 0;        }        int[] height = new int[n];        int[] left = new int[n];        int[] right = new int[n];        Arrays.fill(right, n);        int maxArea = 0;        for(int i=0;i
     
      =0;--j) {                if(matrix[i][j]=='1') {                    right[j] = Math.min(cur_right, right[j]);                }else {                    right[j] = n;                    cur_right = j;                }            }            for(int j=0;j