Validate IP Address
Real-world version: Classify a Host AddressThe statement here is our own: the same inputs, outputs and technique.
A switch's admin console asks the operator to type a host address and has to say what kind of address it got. Given the typed text address, return "IPv4" if it is a valid version 4 address, "IPv6" if it is a valid version 6 address, and "Neither" if it is neither.
A valid IPv4 address is four decimal chunks joined by single dots. Each chunk is one to three digits long, stands for a value from 0 to 255, and carries no leading zero unless the chunk is the single digit 0. So 10.0.42.7 is valid, while 10.0.42.256, 10.0.007.7 and 10.0.42 are not.
A valid IPv6 address is eight groups joined by single colons. Each group is one to four hexadecimal digits, taken from 0-9, a-f and A-F. Leading zeros inside a group are fine and upper and lower case are both fine, but an empty group is not allowed and the shorthand that collapses a run of zero groups is not accepted by this console.
Nothing else counts: an address that is short a chunk, carries an extra separator or mixes the two forms is "Neither".
Examples
Example 1
- Input
- address = "10.0.42.7"
- Output
- "IPv4"
Four digit chunks, each between 0 and 255, none of them with a leading zero.
Example 2
- Input
- address = "012.4.5.6"
- Output
- "Neither"
The first chunk is written "012", and a chunk longer than one digit may not start with 0.
Example 3
- Input
- address = "abcd:1234:0000:0000:9999:aaaa:bbbb:0001"
- Output
- "IPv6"
Eight groups, each one to four hexadecimal digits long.
Example 4
- Input
- address = "1:2:3:4:5:6:7"
- Output
- "Neither"
Only seven groups are present, and this console does not accept a collapsed run.
Constraints
- address consists only of English letters, digits and the characters '.' and ':'.
The signature
The editor starts with this. It matches the parent problem's shape, so a solution that works here works on a standard judge unchanged.
def valid_i_p_address(address: str) -> str:public String validIPAddress(String address)Checking your plan…
How this problem was checked
- Passed: Reference solution run against 17 test cases: 17 passed
- Passed: 4 worked examples confirmed by running the code
- Passed: 0 eight-word sequences shared with the parent problem's text
- Passed: Agrees with an independent brute-force solution on random inputs
- Passed: Test set shown to catch deliberately broken solutions
- Passed: Reviewed by a separate quality pass
- Passed: Function arity matches the parent problem's