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I am getting WA. I tried hard to find the bug. But I failed. Here is my code.

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream ...

My code gives correct output for every input case described here and in the problem statement. But still WA. Someone please help. Here is my code. I got the mistake. thanks brianfry