Maximal Rectangle

Problem Statement

Maximal Rectangle Problem Description Given a `rows x cols` binary matrix filled with '0's and '1's, find the largest rectangle containing only '1's and return its area. Examples Example 1: Input: matrix = [["1","0","1","0","0"],["1","0","1","1","1"],["1","1","1","1","1"],["1","0","0","1","0"]] Output: 6 Explanation: The maximal rectangle is shown in the above picture. Example 2: Input: matrix = [["0"]] Output: 0 Example 3: Input: matrix = [["1"]] Output: 1 Constraints `rows == matrix.length` `cols == matrix[i].length` `1 `matrix[i][j] is '0' or '1'.`