Day06

src/days/06/Day06.cpp

@@ -1,9 +1,41 @@
 #include "Day06.h"
 
 Result Day06::Task1() {
-	return Day::Task1();
+	return to_string(findMarker(4));
 }
 
 Result Day06::Task2() {
-	return Day::Task2();
+	return to_string(findMarker(14));
+}
+
+int Day06::findDuplicate(string value, char* dOut, int mSize) {
+	map<char, int> charPos;
+	for (int i = 0; i < mSize; i++){
+		char c = value[i];
+		if (charPos.contains(c)){
+			*dOut = c;
+			return charPos[c];
+		}
+		charPos.insert({c, i});
+	}
+	return -1;
+}
+
+int Day06::findMarker(int markerSize) const{
+	string signal = input[0];
+
+	int pos = 0;
+	do{
+		string marker = signal.substr(pos, markerSize);
+
+		char d;
+		int dPos = findDuplicate(marker, &d, markerSize);
+		if (dPos == -1)
+			return pos + markerSize;
+
+		pos += dPos + 1;
+	}
+	while (pos < signal.size() - markerSize + 1);
+
+	return -1;
 }

src/days/06/Day06.h

@@ -7,4 +7,7 @@ protected:
 	Result Task1() override;
 
 	Result Task2() override;
+
+	static int findDuplicate(string, char*, int);
+	int findMarker(int markerSize) const;
 };

src/util.h

@@ -6,7 +6,8 @@
 #include <tuple>
 #include <iostream>
 #include <set>
+#include <map>
 
 using std::stoi, std::to_string;
 using std::cout, std::endl;
-using std::string, std::vector, std::set, std::pair;
+using std::string, std::vector, std::set, std::pair, std::map;