#include <iostream>
using namespace std;
int sum( int arr[], int size )
{
int res = 0;
for ( int i = 0; i < size; i++ )
res += arr[ i ];
return res;
}
int main() {
int arr[3]={10,20,30};
std::cout << sum( arr, 3 ) << "\n";
// your code goes here
return 0;
}
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