c++ với mình nhá ??!!!??

#include <bits/stdc++.h>
using namespace std;
long long x,y,z;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    freopen ("DOITUYEN.INP","r",stdin);
    freopen ("DOITUYEN.OUT","w",stdout);
    cin>>x>>y>>z;
    if(x>y+z||x<z||x<y)
    {
        cout<<"None";
    }
    else
    {
        cout<<y+z-x;
    }
    return 0;
}

#include <iostream>
#define fi "DOITUYEN.INP"
#define fo "DOITUYEN.OUT"
using namespace std;
long long a, b, c;
int main() 
{
    freopen (fi, "r", stdin);
    freopen (fo, "w", stdout);
    cin >> a >> b >> c;
    if(a == b+c) cout << "NONE";
    else cout << b+c - a;
    return 0;
}