gistfile1.py

#http://www.bittorrent.com/company/about/developer_challenge
from itertools import combinations

def check_solution(solution):
    for (o1, o2, o3) in combinations(solution, 3):
        if abs(o1 - o2) == abs(o2 - o3):
            return False
    return True

print(sum(map(check_solution, combinations(range(40), 9))))