path: root / pract_SI / Pract. 05 / Solutions / task1.cpp

int firstDuplicateInArray(const int *arr, int size)
{
	for (int i = 0; i < size - 1; i++)
	{
		for (int j = i + 1; j < size; j++)
		{
			if (arr[i] == arr[j])
				return arr[i];
		}
	}
	
	return -1;
}