try this test:
input:
1
2
0 0

output:
NO

because for this sentences in the problem:
"exactly one child has confessed the he (or she) had broken the cup".

I dont notice to this and get WA#2.
sorry for my poor english.

GOOD LUCK!

Edited by author 15.11.2010 23:48

I have a test on the website, no, what should I do?