Added day 6 (two programs. had to rewrite for the second problem). Added starter files.

2022/6/main2.cpp

@@ -0,0 +1,52 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+int main()
+{
+	std::ifstream ifs("data.txt");
+	if(!ifs.is_open())
+	{
+		std::cerr << "Missing data.txt." << std::endl;
+		return -1;
+	}
+
+	for(std::string line; std::getline(ifs, line); )
+	{
+		if(line == "")
+			continue;
+
+		std::vector<char> buf;
+
+		int idx = 0;
+		for(const char &ch : line)
+		{
+			++idx;
+
+			// clear out from beginning up until this character is found:
+			auto i = std::find(buf.begin(), buf.end(), ch);
+			if(i != buf.end())
+				buf.erase(buf.begin(), i+1);
+
+			buf.push_back(ch);
+
+			if(buf.size() == 4)
+			{
+				std::cout << "Start-of-Packet at index " << idx << ": ";
+				for(const char &ch : buf)
+					std::cout << ch;
+				std::cout << std::endl;
+			}
+			else if(buf.size() == 14)
+			{
+				std::cout << "Start-of-Message at index " << idx << ": ";
+				for(const char &ch : buf)
+					std::cout << ch;
+				std::cout << std::endl;
+			}
+		}
+	}
+
+	return 0;
+}