看EVA的集合

实在没有看EVA的了(╥﹏╥)

#include <iostream>
using namespace std;
int main() {
    int n;
    cin>>n;
    if(n>=90&&n<=100){
        cout<<"A";
    }else if(n>=80&&n<=89){
        cout<<"B";
    }else if(n>=70&&n<=79){
        cout<<"C";
    }else if(n>=60&&n<=69){
        cout<<"D";
    }else{
        cout<<"E";
    }
    return 0;
}