test#1
1 1
1 2
5 5
5 6
ans#1
1 1
1 2
5 5
5 6
0 change

test#2
1 1
1 2
1 3
1 4
ans#2
2 1
2 2
1 3
1 4
2 change

test#3
1 1
1 2
1 3
2 2
ans#3
1 1
2 4
1 3
2 2
1 change

Edited by author 03.11.2010 18:06