On this problem testset is wrong! This program got TLE#1:

#include <cstdio>
void main()
{
    char c;
    while((c=getchar()!=EOF))
    {
        while(c!='('&&c!=')');
    }
}

I think that one end of line is not prohibited after brackets.

Yes, there should be end of line in the end of each test.