excel sheet

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int i,t,n;
    cin>>t;
    while(t--)
    {
        cin>>n;
        string s="";
        while(n>0)
        {
            i=n%26;
            if(i==0){s+='Z'; n--;}
            else s+='A'+i-1;
            n/=26;
        }
        reverse(s.begin(),s.end());
        cout<<s<<endl;
    }
    return 0;
}
------------
int titleToNumber(string s)
{
    int result = 0;
    for (const auto& c : s)
    {
        result *= 26;
        result += c  - 'A' + 1;
    }
    return result;
}