add: 220529-CN [cpp]

cpp/2205/220529-CN.cpp

@@ -0,0 +1,81 @@
+#include <string>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+
+/**
+ * 468. Validate IP Address
+ * 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 while "192.168.01.1", "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 <= x[i].length <= 4
+ * x[i] is a hexadecimal string which may contain digits, lowercase 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.
+ */
+
+class Solution {
+private:
+	inline static std::string IPv4 = "IPv4";
+	inline static std::string IPv6 = "IPv6";
+	inline static std::string Neither = "Neither";
+
+	static std::vector<std::string> spilt(const std::string& str, char delimiter) {
+		std::vector<std::string> ret;
+		std::size_t pos = 0, nextPos = 0;
+		while (pos < str.length() && (nextPos = str.find(delimiter, pos)) != std::string::npos) {
+			ret.push_back(str.substr(pos, nextPos - pos));
+			pos = nextPos + 1;
+		}
+		if (pos < str.length())
+			ret.push_back(str.substr(pos));
+		else if (pos == str.length())
+			ret.emplace_back();
+		return ret;
+	}
+
+public:
+	static std::string validIPAddress(const std::string& queryIP) {
+		if (queryIP.find('.') != std::string::npos) { // IPv4
+			auto sp = spilt(queryIP, '.');
+			if (sp.size() != 4)
+				return Neither;
+			for (const std::string& i : sp) {
+				if (i.empty() || (i.front() == '0' && i.length() > 1) || std::any_of(i.begin(), i.end(), [](char c) { return !isdigit(c); }))
+					return Neither; // Leading 0 + empty
+				try {
+					if (std::stoi(i) > 255)
+						return Neither;
+				} catch (...) {
+					return Neither;
+				}
+			}
+			return IPv4;
+		} else if (queryIP.find(':') != std::string::npos) { // IPv6
+			auto sp = spilt(queryIP, ':');
+			if (sp.size() != 8)
+				return Neither; // Yes. This is non-standard.
+			for (const std::string& i : sp) {
+				if (i.empty() || i.length() > 4)
+					return Neither;
+				for (char c : i)
+					if (!isdigit(c) && std::toupper(c) > 'F')
+						return Neither;
+			}
+			return IPv6;
+		} else return Neither;
+	}
+};
+
+int main() {
+	/*
+	auto x = Solution::spilt("172.16.254.1", '.');
+	for (const auto& i : x)
+		std::cout << i << "\n";
+	 */
+	std::cout << (Solution::validIPAddress("20EE:FGb8:85a3:0:0:8A2E:0370:7334"));
+	return 0;
+}

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220529.cpp)
+ADD_EXECUTABLE(2205 220529-CN.cpp)