82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
#include <string>
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#include <vector>
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#include <iostream>
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#include <algorithm>
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/**
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* 468. Validate IP Address
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* 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.
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*
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* 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 while "192.168.01.1", "192.168.1.00", and "192.168@1.1" are invalid IPv4 addresses.
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*
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* A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
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*
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* 1 <= x[i].length <= 4
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* x[i] is a hexadecimal string which may contain digits, lowercase English letter ('a' to 'f') and upper-case English letters ('A' to 'F').
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* Leading zeros are allowed in xi.
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* 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.
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*/
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class Solution {
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private:
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inline static std::string IPv4 = "IPv4";
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inline static std::string IPv6 = "IPv6";
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inline static std::string Neither = "Neither";
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static std::vector<std::string> spilt(const std::string& str, char delimiter) {
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std::vector<std::string> ret;
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std::size_t pos = 0, nextPos = 0;
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while (pos < str.length() && (nextPos = str.find(delimiter, pos)) != std::string::npos) {
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ret.push_back(str.substr(pos, nextPos - pos));
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pos = nextPos + 1;
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}
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if (pos < str.length())
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ret.push_back(str.substr(pos));
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else if (pos == str.length())
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ret.emplace_back();
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return ret;
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}
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public:
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static std::string validIPAddress(const std::string& queryIP) {
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if (queryIP.find('.') != std::string::npos) { // IPv4
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auto sp = spilt(queryIP, '.');
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if (sp.size() != 4)
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return Neither;
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for (const std::string& i : sp) {
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if (i.empty() || (i.front() == '0' && i.length() > 1) || std::any_of(i.begin(), i.end(), [](char c) { return !isdigit(c); }))
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return Neither; // Leading 0 + empty
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try {
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if (std::stoi(i) > 255)
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return Neither;
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} catch (...) {
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return Neither;
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}
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}
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return IPv4;
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} else if (queryIP.find(':') != std::string::npos) { // IPv6
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auto sp = spilt(queryIP, ':');
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if (sp.size() != 8)
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return Neither; // Yes. This is non-standard.
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for (const std::string& i : sp) {
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if (i.empty() || i.length() > 4)
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return Neither;
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for (char c : i)
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if (!isdigit(c) && std::toupper(c) > 'F')
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return Neither;
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}
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return IPv6;
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} else return Neither;
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}
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};
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int main() {
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/*
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auto x = Solution::spilt("172.16.254.1", '.');
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for (const auto& i : x)
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std::cout << i << "\n";
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*/
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std::cout << (Solution::validIPAddress("20EE:FGb8:85a3:0:0:8A2E:0370:7334"));
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return 0;
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}
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