有缩进

#include<bits/stdc++.h>
using namespace std;
int main(){
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    int n;
    cin>>n;
    switch((n+1)%7){
        case 1:cout<<"monday";break;
        case 2:cout<<"tuesday";break;
        case 3:cout<<"wednesday";break;
        case 4:cout<<"thrusday";break;
        case 5:cout<<"friday";break;
        case 6:cout<<"saturday";break;
        case 0:cout<<"sunday";break;
    }
    return 0;
}