case

由于数值较大肯定不能直接算，一周是七天，只要对7取模即可

#include <iostream>
using namespace std;
int main(){
    int a,b,num=1;
    cin >> a >> b;
    for(int i=0;i<b;i++){
        num*=a;
        num%=7;
    }switch(num){
        case 1:cout << "Monday";break;
        case 2:cout << "Tuesday";break;
        case 3:cout << "Wednesday";break;
        case 4:cout << "Thursday";break;
        case 5:cout << "Friday";break;
        case 6:cout << "Saturday";break;
        case 0:cout << "Monday";break;
        default :cout << "NO";
    }
    return 0;
}