class Solution
{
    //Function to reverse the columns of a matrix.
    static void reverseCol(int matrix[][])
    {
       for(int i=0; i<matrix.length; i++){
           for(int j=0; j<matrix[i].length/2; j++)
           {
               int temp = matrix[i][j];
               matrix[i][j] = matrix[i][matrix[i].length-j-1];
               matrix[i][matrix[i].length-j-1] = temp;
           }
       } 
    }
}