题解 | #识别有效的IP地址和掩码并进行分类统计#
识别有效的IP地址和掩码并进行分类统计
https://www.nowcoder.com/practice/de538edd6f7e4bc3a5689723a7435682
import sys
from collections import Counter
def valid_ip(ip):
p = ip.split('.')
if len(p) != 4:
return False
for _ in p:
try:
tmp = int(_)
except:
return False
if not 0 <= tmp <= 255:
return False
return True
def valid_mask(mask):
m = mask.split('.')
if len(m) != 4:
return False
mb = ''
for _ in m:
try:
tmp = int(_)
except:
return False
if not 0 <= tmp <= 255:
return False
bt = bin(tmp)[2:]
if tmp != 0 and len(bt) < 8:
return False
mb += bt
lb = list(mb)
lb = [int(_) for _ in lb]
if sum(lb) in [0, 32]:
return False
while not lb.pop():
pass
return False if 0 in lb else True
def get_ip_type(ip):
p = ip.split('.')
p1 = int(p[0])
if 1 <= p1 <= 126:
return 'A'
elif 128 <= p1 <= 191:
return 'B'
elif 192 <= p1 <= 223:
return 'C'
elif 224 <= p1 <= 239:
return 'D'
return 'E'
def is_private(ip):
p = ip.split('.')
p = [int(_) for _ in p]
if p[0] == 10 or (p[0] == 172 and 16 <= p[1] <= 31) or (p[0] == 192 and p[1] == 168):
return True
return False
ct = Counter()
for line in sys.stdin:
if line:
ip, mask = line.split('~')
ips = ip.split('.')
if ips[0] in ['0', '127']:
continue
masks = mask.split('.')
if not valid_mask(mask):
ct['W'] += 1
continue
if valid_ip(ip):
ct[get_ip_type(ip)] += 1
if is_private(ip):
ct['P'] += 1
else:
ct['W'] += 1
print(ct['A'], ct['B'], ct['C'], ct['D'], ct['E'], ct['W'], ct['P'])
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