rt

#include <bits/stdc++.h>
using namespace std;
int main()
{
    long long n;
    cin >> n;
    for(long long i = 1; i <= n; i++)
    {
        for(long long j = 1; j <= n; j++)
        {
            for(long long k = 1; k <= n; k++)
            {
                cout << i << " " << j << " " << k << endl;
            }
        }
    }
    return 0;
}

能用循环嵌套解决这题吗？
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