311.py

# from https://www.reddit.com/r/dailyprogrammer/comments/65vgkh/20170417_challenge_311_easy_jolly_jumper/

challenges = """4 1 4 2 3
5 1 4 2 -1 6
4 19 22 24 21
4 19 22 24 25
4 2 -1 0 2"""


def solve(challenge):
    numbers = [int(x) for x in challenge.split(' ')]
    count = numbers[0]
    prev = numbers[1]  # so we can skip setup later
    numbers = numbers[2:]

    possible_diffs = list(range(1, count))

    for n in numbers:
        diff = abs(prev - n)

        prev = n
        if diff in possible_diffs:
            possible_diffs.remove(diff)
        else:
            return False

    return True


def solve_all(challenges):
    for challenge in challenges.split('\n'):
        jolly = solve(challenge)

        if jolly:
            print(challenge + ' JOLLY')
        else:
            print(challenge + ' NOT JOLLY')


solve_all(challenges)