题解 | #合法IP#
合法IP
https://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
ip = input().split('.')
def f(x):
if len(x) != 4:
return False
for i in x:
if not i.isdigit():
return False
if int(i) > 255 or (i[0]=='0' and len(i)>1):
return False
return True
if f(ip):
print('YES')
else:
print('NO')
