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Thx works now.

Whenever I try to use std::string I always get compile error.
Here is the example:
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <cctype>
#include <stack>
using namespace std;
const int inf = 1000000000;
string num; //here it says Syntax error before ; token ...

I keep getting WA. I tried everything, and tested with all this IO posted here and even with some tricky IO and everything seems OK. I also tried with different inputs (gets, fgets, getline...). I really cannot see the problem. Here is the source code:

#include <cstdio>
#include <iostream ...