比特C的世界

环境：Ubuntu12.04-amd64

泊松分布def poisson(L): """ poisson distribution return a integer random number, L is the mean value """ p = 1.0 k = 0 e = math.exp(-L) while p >= e: u = random.r

def findcircle(G): """ color = 0 hasn't been visited color = -1 be visited once color = 1 has been dfs, all children of the spot has been visited """ def dfs(G,i,color,is_DAG):