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thank you,
i didn't understood why i always get WA
After reading ypour post i've solved!!!

I've solved, so you can delete the code!!!

#include<iostream>
#include<string>

#define PROVA
#ifdef PROVA

#include<fstream>

using std::ofstream;
using std::ifstream;
using std::string;
//using std::cout;
ofstream cout("output.txt");
ifstream cin("input.txt");

#endif
#ifndef PROVA

using std::cin;
using std::cout;
using std::string ...

i've solved!
There was a problem with input!
I had to put a test of nullity after cin!

What's wrong in my code (that could be optimised)

#include<iostream>

//#define PROVA
#ifdef PROVA

#include<fstream>
using std::ofstream;
using std::ifstream;
//using std::cout;
ofstream cout("output.txt");
ifstream cin("input.txt");

#endif
#ifndef PROVA

using std::cin;
using std::cout;

#endif ...

Hallo to everybody,
first of all sorry for my english!!!
Can anyone help me understanding what's wrong in my program
Here's the code

#include<iostream>
#include<stdio.h>
#include<iomanip>

//#define PROVA
#ifdef PROVA

#include<fstream>
using std::ofstream;
using std::ifstream;
using std ...