Answer 2 Looping CPP

#include <bits/stdc++.h>
using namespace std;
#define FIO                           \
    ios_base::sync_with_stdio(false); \
    cin.tie(NULL);                    \
    cout.tie(NULL);

int main()
{
    FIO;
    int n;
    cin >> n;
    int i = 1;
    while (i <= n)
    {
        char startChar = 'A' + n - i;
        int j = 1;
        while (j<=i)
        {
            char ch=startChar + j - 1;
            cout<<ch;
            j++;
        }
        cout << endl;
        i++;
    }
}