题解

#include <bits/stdc++.h>
using namespace std;
int main(){
    int date;
    cin >> date;
    date = (date + 1) % 7;  //加1取余获得星期几（比实际日期少1）
    switch(date){
        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 << "sunday";
            break;
    }
    return 0;
}