Computer Programming Contest Preparation

    1 9
    2 2 2 3
    3 1 4
    4 1 4
    5 0
    6 4 6 7 8 9
    7 0
    8 0
    9 0
   10 0
   11 0
   12 
   13 1 2 3 4 5 6 7 8 9
   14 1 x 1 1 2 0 0 0 0 0
   15 2 0 x 0 1 0 0 0 0 0
   16 3 0 0 x 1 0 0 0 0 0
   17 4 0 0 0 x 0 0 0 0 0
   18 5 0 0 0 0 x 1 1 1 1
   19 6 0 0 0 0 0 x 0 0 0
   20 7 0 0 0 0 0 0 x 0 0
   21 8 0 0 0 0 0 0 0 x 0
   22 9 0 0 0 0 0 0 0 0 x
   23