Discussion About KTH ROOT

#1

This is Discussion thread about KTH ROOT

#2 
#include<bits/stdc++.h>
using namespace std;
int main() { 
int q;
cin>>q;
for(int i=0;i<q;i++){
	unsigned long long n;
    double k;
	cin>>n>>k;
	double k1=1/k;
    //cout<<k1<<endl;
	unsigned long long a=pow(n,k1);
	cout<<a<<endl;
} 
}

Can anyone pls tell the problem with this code.
Test Case 3 says Wrong Answer