题解 100% AC

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;cin>>n;
    n%=7;
    if(n==0)cout<<"monday";
    else if(n==1)cout<<"tuesday";
    else if(n==2)cout<<"wednesday";
    else if(n==3)cout<<"thursday";
    else if(n==4)cout<<"friday";
    else if(n==5)cout<<"saturday";
    else if(n==6) cout<<"sunday";
    return 0;
}