20 50
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
2 1
1 17
1 14
2 4
1 8
1 5
2 5
1 19
1 16
2 4
1 10
1 7
2 1
1 1
1 18
2 0
1 12
1 9
2 6
1 3
1 0
2 8
1 14
1 11
2 0
1 5
1 2
2 1
1 16
1 13
2 6
1 7
1 4
2 4
1 18
1 15
2 5
1 9
1 6
2 3
1 0
1 17
2 6
1 11
1 8
2 5
1 2
1 19
2 1
1 13