Computer Programming Contest Preparation

    1 5
    2 -1 2
    3     -2 0 -1
    4     1
    5     1
    6     3
    7     0 0 0
    8     5
    9     -5 5
   10     4 6 -11
   11     3
   12     -1 -5 -7
   13     0
   14