In python:

Wrong Answer

Input (stdin)

1

7

1 2 3 4 5 6 7

Your Output (stdout)

1 2 3 7 6 5 4

Expected Output

1 2 3 7 6 5 4

This is a garbage challenge. First, the Python code I'm supposed to modify is horrible, as if it were written by a first semester compsci student. Granted, most Python programmers are cavemen, but this starter solution was truly gross.

After fixing the three off-by-one situations, my output is exactly what the sample solution output shows (and matches the requirements). But it says the answer is wrong. And it fails every test (which I can't see). Utter waste of time.

You have to make 3 character changes. more than that it will fail. This is what i did and it worked after that

mid = int((n + 1)/2)  -> mid = int((n - 1)/2)
ed = n - 1   -> ed = n - 2
ed = ed + 1 -> ed = ed - 1

I have made 3 changes of the code using Python 3, and I got the same results as expected results, still it said Wrong answer.

    mid = (n - 1) // 2

ed = n - 2

    ed = ed - 1

anyone knows why?

`What is the problem?

//C++

void findZigZagSequence(vector < int > a, int n){

    sort(a.begin(), a.end());

    int mid = (n + 1)/2;

    int st = mid - 1;

    int ed = n - 1;

    while(st <= ed){

        swap(a[st], a[ed]);

        st = st + 1;

        ed = ed - 1;

    }

    for(int i = 0; i < n; i++){

        if(i > 0) cout << " ";

        cout << a[i];

    }

    cout << endl;

} `

running failed: compiler Message Wrong Answer

Input (stdin)

1

7

1 2 3 4 5 6 7

Your Output (stdout)

1 2 3 7 6 5 4

Expected Output

1 2 3 7 6 5 4