GIAIMA C++

#include <bits/stdc++.h>
using namespace std;
string s;
int n;

void mahoa()
{
    for(int i=0;i<s.length();i++)
    {
        int x = int(s[i])-65;
        x = x+5;
        x = x%26;
        cout << char(x+65);
    }
}

void giaima()
{
    for(int i=0;i<s.length();i++)
    {
        int x = int(s[i])-65;
        if(x>=5) x = x-5;
        else x=x+26-5;
        cout << char(x+65);
    }
}

void solve()
{
    int test;
    cin >> test;
    getline(cin,s);//xuong hang
    for(int i=1;i<=test;i++)
    {
        cin >> n; 
        getline(cin,s);//xuong hang
        getline(cin,s);    //doc xau s
        if(n==0) mahoa();
        else giaima();
    }
}


int main()
{
    freopen("giaima.inp","r",stdin);
    freopen("giaima.out","w",stdout);
    solve();
}