题解 | #判断两个IP是否属于同一子网#

while True:
    try:
        subnet = list(map(int, input().split(".")))
        net1 = list(map(int, input().split(".")))
        net2 = list(map(int, input().split(".")))
        temp = []

        def IPChange(ip):
            subnet_b = ""
            for i in ip:
                if i > 255 or i < 0:
                    return 1
                else:
                    subnet_b1 = format(i, "b").rjust(8, "0")
                    subnet_b = subnet_b + subnet_b1
            return subnet_b

        subnetChange = IPChange(subnet)
        net1Change = IPChange(net1)
        net2Change = IPChange(net2)
        ipresult1 = ""
        ipresult2 = ""
        if (
            subnetChange == 1
            or net1Change == 1
            or net2Change == 1
            or subnetChange[:8] != "11111111"
            or subnetChange[-8:] != "00000000"
        ):
            print(1)
        else:
            for n in range(len(subnetChange)):
                if subnetChange[n] == "1" and net1Change[n] == "1":
                    ipresult1 = ipresult1 + "1"
                else:
                    ipresult1 = ipresult1 + "0"
            for n in range(len(subnetChange)):
                if subnetChange[n] == "1" and net2Change[n] == "1":
                    ipresult2 = ipresult2 + "1"
                else:
                    ipresult2 = ipresult2 + "0"
            if ipresult1 == ipresult2:
                print(0)
            else:
                print(2)
    except:
        break