题解 | #合法IP#
合法IP
https://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
blocks = input().split(".")
def isvalid():
if len(blocks) != 4:
return False
for block in blocks:
if not block or not 0 <= int(block) < 256 or len(block) != len(str(int(block))):
return False
return True
print("YES" if isvalid() else "NO")
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