LightOJ - 1282 求n^k次幂 前三位和后三位

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn = 1e6+5;
ll quick(ll a,ll b) {
	ll ans = 1;
	while(b) {
		if((b&1))ans=ans*a%1000;
		a=a*a%1000;
		b>>=1;
	}
	return ans%1000;
}
int main() {
	
	int t,cnt=1;
	double ans1,ans2;
	scanf("%d",&t);
	while(t--){
		double a,b;
		cin>>a>>b;
		ans1 = quick(a,(ll)b);
		
		ans2 = b*log10(a);
		ans2 -=floor(ans2);
		ans2 = pow(10,ans2)*100;
		
		printf("Case %d: %03.0lf %03.0lf\n",cnt++,floor(ans2),ans1);
	}
	return 0;
}