Solve day 1 part 1

.gitignore

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+input.txt
+.idea/
+day_*
+!*.cpp

day_1.cpp

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+#include <fstream>
+#include <iostream>
+
+int main()
+{
+	int dial = 50;
+	int password = 0;
+
+	std::ifstream file("input.txt");
+	std::string line;
+
+	while (getline(file, line)) {
+		int delta = std::stoi(line.substr(1));
+
+		switch (line[0]) {
+			case 'L':
+				dial -= delta;
+				while (dial < 0) dial += 100;
+				break;
+			case 'R':
+				dial = (dial + delta) % 100;
+				break;
+		}
+
+		if (dial == 0) password++;
+	}
+
+	std::cout << password << std::endl;
+
+	return 0;
+}