(C++) - 백준(BOJ) 15921번 : 수찬은 마린보이야!!

https://www.acmicpc.net/problem/15921

15921번: 수찬은 마린보이야!!

 

#include <iostream>
using namespace std;
int main() {
    double n;
    double a[101];
    double avg = 0;
    double exp = 0;
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        avg += a[i];
        exp += a[i] * 1 / n;
    }
    avg /= n;
    if (exp == 0 || n == 0)
        printf("divide by zero\n");
    else
        printf("%.2f\n", avg / exp);
}