题解 | #判断两个IP是否属于同一子网#

while True:
    try:
        #子网掩码
        subnet_mask= list(map(int,input().split('.')))
        #ip
        ip1 = list(map(int,input().split('.')))
        ip2 = list(map(int,input().split('.')))
        if subnet_mask[0] !=255 or subnet_mask[3] !=0 or max(subnet_mask+ip1+ip2) >255 or min(subnet_mask+ip1+ip2) <0:
            print('1')
        else:
            ip1_mask = [ip1[i]&subnet_mask[i] for i in range(4)]
            ip2_mask = [ip2[i]&subnet_mask[i] for i in range(4)]
            if ip1_mask == ip2_mask:
                print('0')
            else:
                print('2')
    except:
        break