Question 1 Peculiar Number

#include <bits/stdc++.h>
using namespace std;
int sum_of_digit(int n)
{
    if (n == 0)
        return 0;
    return (n%10+sum_of_digit(n/10));
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int t,a,n,res=0,k;
    cin>>t;
    while(t--){
        cin>>a>>n;
        res=pow(a,n);
        k=sum_of_digit(res);
        cout<<k<<"\n";
    }
    return 0;
}