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题目：
题解：
class Solution {public int maximalRectangle(char[][] matrix) {int m = matrix.length;if (m == 0) {return 0;}int n = matrix[0].length;int[][] left = new int[m][n];for (int i = 0; i < m; i++) {for (int j = 0; j < n; j++) {if (matrix[i][j] == '1') {left[i][j] = (j == 0 ? 0 : left[i][j - 1]) + 1;}}}int ret = 0;for (int j = 0; j < n; j++) { // 对于每一列，使用基于柱状图的方法int[] up = new int[m];int[] down = new int[m];Deque<Integer> stack = new LinkedList<Integer>();for (int i = 0; i < m; i++) {while (!stack.isEmpty() && left[stack.peek()][j] >= left[i][j]) {stack.pop();}up[i] = stack.isEmpty() ? -1 : stack.peek();stack.push(i);}stack.clear();for (int i = m - 1; i >= 0; i--) {while (!stack.isEmpty() && left[stack.peek()][j] >= left[i][j]) {stack.pop();}down[i] = stack.isEmpty() ? m : stack.peek();stack.push(i);}for (int i = 0; i < m; i++) {int height = down[i] - up[i] - 1;int area = height * left[i][j];ret = Math.max(ret, area);}}return ret;}
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