Geeksforgeeks Solution For " Nearest Power "

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Problem :- Nearest Power 

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Solution :- 

#include <bits/stdc++.h>
using namespace std;
int main()
 {
    long long t, n, m, p, ans, a, b;
    cin>>t;
    while(t--){
        cin>>n>>m;
        p=log(n)/log(m);
        a=pow(m,floor(p));
        b=a*m;
        if(b-n<=n-a)
            ans=b;
        else
            ans=a;
        cout<<ans<<endl;
    }
    return 0;
}

Output:-