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头文件👇

#include<bits/stdc++.h>

也可以用👇

#include<iostream>
#include<string>

我用了数组（字符串）👇

string a[8]={"0","MON","TUE","WED","THU","FRI","SAT","SUN"};

这么声明哦👆

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string a[8]={"0","MON","TUE","WED","THU","FRI","SAT","SUN"};
    string b;
    long long c;
    cin >> b >> c;
    int i=1;
    for(;i<=7;i++){
        if(a[i]==b) break;
    }
    i=(i+c)%7;
    if(i==0) i=7;
    cout << a[i];
}