You are given a binary matrix matrix of size m x n, and you are allowed to rearrange the columns of the matrix in any order. Return the area of the largest submatrix within matrix where every element of the submatrix is 1 after reordering the columns optimally. Example 1: Input: matrix = [[0,0,1],[1,1,1],[1,0,1]] Output: 4 Explanation: You can rearrange the columns as shown above. The largest submatrix of 1s, in bold, has an area of 4. Example 2: Input: matrix = [[1,0,1,0,1]] Output: 3 Explanation: You can rearrange the columns as shown above. The largest submatrix of 1s, in bold, has an area of 3. Example 3: Input: matrix = [[1,1,0],[1,0,1]] Output: 2 Explanation: Notice that you must rearrange entire columns, and there is no way to make a submatrix of 1s larger than an area of 2. Example 4: Input: matrix = [[0,0],[0,0]] Output: 0 Explanation: As there are no 1s, no submatrix of 1s can be formed and the area is 0. Constraints: m == matrix.length n == matrix[i].length 1 <= m * n <= 105 matrix[i][j] is 0 or 1.