题解 | #合法IP#
合法IP
https://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9?tpId=37&tqId=21313&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3Fpage%3D2%26tpId%3D37%26type%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=
import sys
#for line in sys.stdin:
# a = line.split()
# print(int(a[0]) + int(a[1]))
s=input()
def islegal(s):
'''
将s按.分割分别对其中的每个元素做判断
x不能小于0
x不能大于255
x不能以0开头，长度大于1
x不能不是数字
L的长度不能不等于4
'''
L=s.split(".")
if len(L)!=4:
print("NO")
return False
for x in L:
if not x.isdigit():
print("NO")
return False
elif int(x)<0 or int(x)>255 or (x.startswith('0') and len(x) > 1):
print("NO")
return False
print("YES")
return True
islegal(s)
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