My tests (N, Array, Answer):
[8, '6 7 9 13 18 24 31 50', 0],
[5, '5 5 4 3 3', 0],
[5, '3 3 4 5 5', 0],
[1, '1', 1],
[1, '2', 2],
[6, '1 4 5 6 7 9', 0],
[5, '5 8 13 27 14', 3],
[5, '5 4 3 3 3', 0],
[5, '11 10 8 7 6', 0],
[6, '1 4 5 6 7 9', 0],
[6, '9 7 6 5 4 1', 0],
[7, '1 2 3 4 5 6 6', 1],
[3, '1 1 5', 3],
[6, '1 2 3 4 100 100', 0],
[5, '5 8 13 14 15', 1],
[5, '4 6 6 7 9', 0],
[7, '36 25 12 10 8 7 1', 1],
[6, '101 51 51 3 2 2', 0],
[6, '1 4 5 6 7 9', 0],
[4, '1 3 9 27', 14],
[6, '6 6 5 4 3 2', 0],
[20, '1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20', 0]

All tests = True.
What I do wrong?

Edited by author 17.11.2016 19:27

Edited by author 17.11.2016 20:03