2500. Delete Greatest Value in Each Row 

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class Solution {
    public int deleteGreatestValue(int[][] grid) {
        int m = grid.length, n = grid[0].length;

        for (int[] row : grid) {
            Arrays.sort(row);
        }

        int res = 0;
        for (int j = n - 1; j >= 0; j--) {
            int maxValue = 0;
            for (int i = 0; i < m; i++) {
                maxValue = Math.max(maxValue, grid[i][j]);
            }
            res += maxValue;
        }

        return res;
    }
}

References

2500. Delete Greatest Value in Each Row