백준 15596 : 정수 N개의 합

#include <iostream>
#include <vector>
using namespace std;
 
long sum(vector<int> &a) {
 
    long sum = 0;
 
    for (int i = 0; i < a.size(); i++) {
        sum += a[i];
    }
    return sum;
}
 
 
void main() {
 
    int n;
    cin >> n;
    vector<int> a(n);
 
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    cout << sum(a) << endl;
}