Sum of array elements

Problem

Given an array of integers, return the sum of the elements in the array.
Example input: [1, 2, 3, 4, 5]
Example output: 15

Solution

This solution is in C++. Our A.I. can create solutions in multiple languages.

kayakane

#include <iostream>
#include <vector>

using namespace std;

int sum(vector<int> arr) {
    int sum = 0;
    for (int i = 0; i < arr.size(); i++) {
        sum += arr[i];
    }
    return sum;
}

int main() {
    vector<int> arr = {1, 2, 3, 4, 5};
    cout << sum(arr) << endl;
    return 0;
}

/*

This solution is optimal because it is O(n) time complexity.

*/