题解 | #合法IP#
合法IP
http://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
import sys
import os
ip_string = sys.stdin.readline().strip().split(".")
result = "YES"
if len(ip_string) != 4:
result = "NO"
try:
for i in ip_string:
if "+" in i:
result = "NO"
if int(i) >255&nbs***bsp;int(i) < 0:
result = "NO"
if len(i) > 1 and i.startswith("0"):
result = "NO"
except:
result = "NO"
print(result)
