Sum of all elements in an array

This problem asks the programmer to find the sum of all elements in an array. An example input is given, along with the expected output.


Given an array of integers, find the sum of all elements in the array.
Example input: [1, 2, 3, 4]
Example output: 10


This solution is in C++. Our A.I. can create solutions in multiple languages.
by kayakane
#include <iostream>
#include <vector>

using namespace std;

int main() {
    vector<int> arr = {1, 2, 3, 4};
    int sum = 0;
    for (int i = 0; i < arr.size(); i++) {
        sum += arr[i];
    cout << sum << endl;
    return 0;


The solution above is optimal because it uses a single for loop to iterate through the array and add each element to the sum.
The time complexity of this solution is O(n) because the for loop iterates through the array once.


A.I. Evaluation of the Solution

The candidate's solution is correct and uses an optimal approach. The time complexity of the solution is O(n).

Evaluated at: 2022-11-26 08:15:47