Sample Input 6 1 2 3 4 10 11 |||| Sample Output 31

simple_sum_of_array.cpp

#include <bits/stdc++.h>
using namespace std;
int simpleArraySum(int n, vector <int> ar)
{
    int sum = 0;
    for(int i = 0; i < n ; i++){
        sum += ar[i];
    }
    return(sum);
}
int main() {
    int n;
    cin >> n;
    vector<int> ar(n);
    for(int ar_i = 0; ar_i < n; ar_i++){
       cin >> ar[ar_i];
    }
    int result = simpleArraySum(n, ar);
    cout << result << endl;
    return 0;
}