problem: CodeChef: Practical coding for everyone
#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int t;
cin>>t;
while(t--)
{
long int x,m,rev=0,last=0,mod=0,p=0;
cin>>x>>m;
while(x>0)
{
last=x%10;
p=pow(last,m);
mod=p%10;
rev=(rev*10)+mod;
x=x/10;
}
if(rev%7==0)cout<<"YES"<<'\n';
else cout<<"NO"<<'\n';
}
return 0;
}
//rev=pow((((rev*10)+last))%10,m);
above code working for some test cases but except one test case that is
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