Angka Huruf

#include <iostream>

int main() {
    int i, j, k;
    char c;

    int N;  // Berapa baris?

    std::cin >> N;

    for (i = 1, k = 1, c = 'A'; i <= N; i++) {
        for (j = 0; j < i; j++, k *= 2, c++) {
            std::cout << k << c << ' ';
            if (c == 'Z')
                c = 'A';
        }
        std::cout << std::endl;
    }
    return 0;
}