https://www.acwing.com/problem/content/description/5479/
思路
直接算,但是注意double.
C++ 代码
#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int main(){
double a, b, c;
cin >> a >> b >> c;
double avg = (a + b + c) / 3;
if(avg > 60) printf("YES");
else printf("NO");
}