Row Maximum / Column Minimum

Find the matrix element that is largest in its row and smallest in its column; print `-1` if no such element exists. Requirements Input line 1 contains matrix_row and matrix_col. The next lines contain the matrix elements. Print a number that is largest in its row and smallest in its column. If no element exists, print -1. Constraints shown: 1 <= N, M <= 1000. Each matrix value is a non-negative integer. Examples Input: 2 2 1 2 3 4 Output: 2 Explanation: 2 at index (0,1) is the largest in its row and smallest in its column. Notes Precompute row maxima and column minima, then scan for intersections.