First get the maximum of each row, and afterwards set all the other elements to zero. For example, this matrix:

1 	2 	3 	4
5 	5 	6 	5
7 	9 	8 	3

should become:

0 	0 	0 	4
0 	0 	6 	0
0 	9 	0 	0

Input will never be empty.

If a row has the same maximum in different columns , display the first occurrence:

In the below example, the second row has twice the number 8 as maximum , the output will display the first 8 (column2) :

   x =

       5     4     5
       2     8     8

   should become :

     5     0     0
     0     8     0