No, where did the 5 go? You can only skip 1 value (the one at index N).

I think that this test is wrong (c++):

{
vector numbers { 1,2,3,4,5,6 };
int expected = -1;
Assert::That(find_even_index (numbers), Equals(expected));
}
I think the answer should be 3 because left side {1, 2, 3} is equal to {6}