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validate-ip-address.py
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validate-ip-address.py
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"""
468. Validate IP Address
Medium
Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid IPv6 address or "Neither" if IP is not a correct IP of any type.
A valid IPv4 address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi cannot contain leading zeros. For example, "192.168.1.1" and "192.168.1.0" are valid IPv4 addresses but "192.168.01.1", while "192.168.1.00" and "192.168@1.1" are invalid IPv4 addresses.
A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
1 <= xi.length <= 4
xi is a hexadecimal string which may contain digits, lower-case English letter ('a' to 'f') and upper-case English letters ('A' to 'F').
Leading zeros are allowed in xi.
For example, "2001:0db8:85a3:0000:0000:8a2e:0370:7334" and "2001:db8:85a3:0:0:8A2E:0370:7334" are valid IPv6 addresses, while "2001:0db8:85a3::8A2E:037j:7334" and "02001:0db8:85a3:0000:0000:8a2e:0370:7334" are invalid IPv6 addresses.
Example 1:
Input: queryIP = "172.16.254.1"
Output: "IPv4"
Explanation: This is a valid IPv4 address, return "IPv4".
Example 2:
Input: queryIP = "2001:0db8:85a3:0:0:8A2E:0370:7334"
Output: "IPv6"
Explanation: This is a valid IPv6 address, return "IPv6".
Example 3:
Input: queryIP = "256.256.256.256"
Output: "Neither"
Explanation: This is neither a IPv4 address nor a IPv6 address.
Constraints:
queryIP consists only of English letters, digits and the characters '.' and ':'.
"""
# V0
# IDEA : Divide and Conquer
class Solution:
def validate_IPv4(self, IP):
nums = IP.split('.')
for x in nums:
# Validate integer in range (0, 255):
# 1. length of chunk is between 1 and 3
if len(x) == 0 or len(x) > 3:
return "Neither"
# 2. no extra leading zeros
# 3. only digits are allowed
# 4. less than 255
if x[0] == '0' and len(x) != 1 or not x.isdigit() or int(x) > 255:
return "Neither"
return "IPv4"
def validate_IPv6(self, IP):
nums = IP.split(':')
hexdigits = '0123456789abcdefABCDEF'
for x in nums:
# Validate hexadecimal in range (0, 2**16):
# 1. at least one and not more than 4 hexdigits in one chunk
# 2. only hexdigits are allowed: 0-9, a-f, A-F
if len(x) == 0 or len(x) > 4 or not all(c in hexdigits for c in x):
return "Neither"
return "IPv6"
def validIPAddress(self, IP):
if IP.count('.') == 3:
return self.validate_IPv4(IP)
elif IP.count(':') == 7:
return self.validate_IPv6(IP)
else:
return "Neither"
# V0'
class Solution(object):
def validIPAddress(self, IP):
"""
:type IP: str
:rtype: str
"""
if self.validIPV4(IP):
return 'IPv4'
if self.validIPV6(IP):
return 'IPv6'
return 'Neither'
def validIPV4(self, IP):
parts = IP.split('.')
if len(parts) != 4: return False
for part in parts:
if not part: return False
if not part.isdigit(): return False
if part[0] == '0' and len(part) > 1: return False
if int(part) > 255: return False
return True
def validIPV6(self, IP):
parts = IP.split(':')
if len(parts) != 8: return False
for part in parts:
if not part: return False
if len(part) > 4: return False
if any(c not in string.hexdigits for c in part): return False
return True
# V0''
# TODO : fix below
# class Solution(object):
# def validIPAddress(self, queryIP):
# if len(queryIP) == 0:
# return "Neither"
#
# ip_type = None
#
# if "." in queryIP:
# _queryIP_list = queryIP.split(".")
# ip_type = "IPv4"
# else:
# _queryIP_list = queryIP.split(":")
# ip_type = "IPv6"
#
# # check IPV4
# if ip_type == "IPv4":
# if len(_queryIP_list) != 4:
# return "Neither"
# for i, ip in enumerate(_queryIP_list):
# if not ip.isnumeric():
# return "Neither"
# if int(ip) > 255 or int(ip) < 0:
# return "Neither"
# if "00" in ip or (i < len(_queryIP_list) and "0" in ip):
# return "Neither"
# return "IPv4"
#
# # check IPV6
# if ip_type == "IPv6":
# invalid_alpha = "klmnopqrstuvwxyz"
# if len(_queryIP_list) != 8:
# return "Neither"
# for ip in _queryIP_list:
# print ("ip = " + str(ip) )
# for invalid in invalid_alpha:
# if invalid.upper() in ip or invalid.lower() in ip:
# return "Neither"
# if len(ip) > 4 or len(ip) < 1 or ( ip.startswith("00") and ip.count("0") * "0" != ip):
# return "Neither"
# return "IPv6"
# V1
# https://leetcode.com/problems/validate-ip-address/solution/
# IDEA : REGEX
import re
class Solution:
chunk_IPv4 = r'([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
patten_IPv4 = re.compile(r'^(' + chunk_IPv4 + r'\.){3}' + chunk_IPv4 + r'$')
chunk_IPv6 = r'([0-9a-fA-F]{1,4})'
patten_IPv6 = re.compile(r'^(' + chunk_IPv6 + r'\:){7}' + chunk_IPv6 + r'$')
def validIPAddress(self, IP: str) -> str:
if self.patten_IPv4.match(IP):
return "IPv4"
return "IPv6" if self.patten_IPv6.match(IP) else "Neither"
# V1'
# https://leetcode.com/problems/validate-ip-address/solution/
# IDEA : Divide and Conquer
class Solution:
def validate_IPv4(self, IP: str) -> str:
nums = IP.split('.')
for x in nums:
# Validate integer in range (0, 255):
# 1. length of chunk is between 1 and 3
if len(x) == 0 or len(x) > 3:
return "Neither"
# 2. no extra leading zeros
# 3. only digits are allowed
# 4. less than 255
if x[0] == '0' and len(x) != 1 or not x.isdigit() or int(x) > 255:
return "Neither"
return "IPv4"
def validate_IPv6(self, IP: str) -> str:
nums = IP.split(':')
hexdigits = '0123456789abcdefABCDEF'
for x in nums:
# Validate hexadecimal in range (0, 2**16):
# 1. at least one and not more than 4 hexdigits in one chunk
# 2. only hexdigits are allowed: 0-9, a-f, A-F
if len(x) == 0 or len(x) > 4 or not all(c in hexdigits for c in x):
return "Neither"
return "IPv6"
def validIPAddress(self, IP: str) -> str:
if IP.count('.') == 3:
return self.validate_IPv4(IP)
elif IP.count(':') == 7:
return self.validate_IPv6(IP)
else:
return "Neither"
# V1'''
# http://bookshadow.com/weblog/2016/12/11/leetcode-validate-ip-address/
# IDEA :
# IPV4 : -> x.y.z.u, while 0 < x,y,z,u < 255 (Decimal)
# -> can't tart with 0 -> i.e. 172.1.2.01 is not a validated IPV4 address
#
# IPV6 : -> a:b:c:d:e:f:g:h (Hexadecimal)
# -> it's OK to replace continuous 0 with a single 0
# => i.e. 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is OK
# => 2001:db8:85a3:0:0:8A2E:0370:7334 is OK as well
# -> it's illegal to have a contunous ":" -> i.e. 2001:0db8:85a3::8A2E:0370:7334 is NOT LEAGAL
# -> it's illegal to have an extra 0 -> i.e. 02001:0db8:85a3:0000:0000:8a2e:0370:7334 is NOT LEAGAL
#
#
# In [59]: import string
# In [60]: string.hexdigits
# Out[60]: '0123456789abcdefABCDEF'
import string
class Solution(object):
def validIPAddress(self, IP):
"""
:type IP: str
:rtype: str
"""
if self.validIPV4(IP):
return 'IPv4'
if self.validIPV6(IP):
return 'IPv6'
return 'Neither'
def validIPV4(self, IP):
parts = IP.split('.')
if len(parts) != 4: return False
for part in parts:
if not part: return False
if not part.isdigit(): return False
if part[0] == '0' and len(part) > 1: return False # Ipv4 is a 4 digits (0-255) split with ","
if int(part) > 255: return False
return True
def validIPV6(self, IP):
parts = IP.split(':')
if len(parts) != 8: return False
for part in parts:
if not part: return False
if len(part) > 4: return False
if any(c not in string.hexdigits for c in part): return False # Ipv6 is a 8 hex-decimal digits split with ":"
return True
# V1'''''
# https://www.jiuzhang.com/solution/validate-ip-address/#tag-highlight-lang-python
class Solution(object):
def validIPAddress(self, IP):
"""
:type IP: str
:rtype: str
"""
ip = IP.split('.')
if len(ip) == 4:
# ipv4 candidate, validate it
for octet_s in ip:
try:
octet = int(octet_s)
except ValueError:
return 'Neither'
if octet < 0 or octet > 255 or (octet_s != '0' and (octet // 10**(len(octet_s) - 1) == 0)):
return 'Neither'
return 'IPv4'
else:
ip = IP.split(':')
if len(ip) == 8:
# ipv6 candidate, validate it
for hexa_s in ip:
if not hexa_s or len(hexa_s) > 4 or not hexa_s[0].isalnum():
return 'Neither'
try:
hexa = int(hexa_s, base=16)
except ValueError:
return 'Neither'
hexa_redo = '{:x}'.format(hexa)
if hexa < 0 or hexa > 65535:
return 'Neither'
return 'IPv6'
return 'Neither'
# V2
# Time: O(1)
# Space: O(1)
import string
class Solution(object):
def validIPAddress(self, IP):
"""
:type IP: str
:rtype: str
"""
blocks = IP.split('.')
if len(blocks) == 4:
for i in range(len(blocks)):
if not blocks[i].isdigit() or not 0 <= int(blocks[i]) < 256 or \
(blocks[i][0] == '0' and len(blocks[i]) > 1):
return "Neither"
return "IPv4"
blocks = IP.split(':')
if len(blocks) == 8:
for i in range(len(blocks)):
if not (1 <= len(blocks[i]) <= 4) or \
not all(c in string.hexdigits for c in blocks[i]):
return "Neither"
return "IPv6"
return "Neither"