Print Every Other Element

Write a function void printEveryOther(const vector<int>& v) that prints the elements at positions 0, 2, 4, ... each followed by a single space, and then a newline. Walk the vector with one iterator and move it with advance(it, 2). Before each jump, make sure at least 2 steps remain (use distance(it, v.end())); if fewer remain, leave the loop. The newline is printed exactly once, after the loop, no matter how it ended. For an empty vector print just the newline.

For {1, 2, 3, 4, 5} the function prints the line 1 3 5; for {1, 2, 3, 4} it prints 1 3. The hidden test only calls your function — it prints nothing else.

Do NOT write a main function.