题解 | 判断两个IP是否属于同一子网

while True:
    try:
        mask = input().split('.')
        ip1,ip2 = input().split('.'),input().split('.')
        m,n = [],[]
        ip1 = list(map(int,ip1))
        ip2 = list(map(int,ip2))
        mask = [int(x) for x in mask]
        xxx = ''.join([f'{bin(x)[2:]:0>8}' for x in mask])
        if max(ip1+ip2+mask) > 255 or min(ip1+ip2+mask)<0:
            print('1')
        elif xxx[0] != '1' or '01'in xxx:
            print('1')
        else:
            for i in range(len(mask)):
                m.append(ip1[i]&mask[i])
                n.append(ip2[i]&mask[i])
            if m == n:
                print('0')
            else:
                print('2')
    except:
        break