用的是快速幂

#include<bits/stdc++.h>
using namespace std;
long long a,b;
long long ans=1;
int main(){
    //freopen("pow.in","r",stdin);
    //freopen("pow.out","w",stdout);
    cin>>a>>b;
    while(b&&ans<=1e9){
        if(b%2) ans=ans*a;
        b/=2;
        a=a*a;
    }
    if(ans>1e9) cout<<"-1";
    else cout<<ans;
    //fclose(stdin);
    //fclose(stdout);
    return 0;
}