Day 2

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+# set the project name
+project(AdventofCode2021)
+
+# specify the C++ standard
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+add_subdirectory(day1)
+add_subdirectory(day2)

day2/CMakeLists.txt

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+# set the project name
+project(d2p1)
+
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+
+# add the executable
+add_executable(d2p1 part1/main.cpp)
+add_executable(d2p2 part2/main.cpp)

day2/part1/main.cpp

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+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+struct Command {
+    string direction;
+    int distance;
+};
+
+int main() {
+    cout << "Advent of Code 2021 - Day 2 Part 1" << endl;
+
+    int x, y = 0;
+
+    ifstream filein("input");
+    vector<Command> inputCommands;
+    for(string line; getline(filein, line);) {
+        int space = line.find(" ");
+        inputCommands.push_back(Command {line.substr(0, space), stoi(line.substr(space+1))});
+    }
+
+    for(Command cmd : inputCommands) {
+        if(cmd.direction == "forward") {
+            x += cmd.distance;
+        }
+        else if (cmd.direction == "down") {
+            y += cmd.distance;
+        }
+        else if(cmd.direction == "up") {
+            y -= cmd.distance;
+        }
+        else {
+            cout << "Uh I shouldn't get here in the for cmd loop" << endl;
+        }
+    }
+
+    cout << x * y << endl;
+
+    return 0;
+}

day2/part2/main.cpp

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+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+struct Command {
+    string direction;
+    int distance;
+};
+
+int main() {
+    cout << "Advent of Code 2021 - Day 2 Part 2" << endl;
+
+    int x, y, aim = 0;
+
+    ifstream filein("input");
+    vector<Command> inputCommands;
+    for(string line; getline(filein, line);) {
+        int space = line.find(" ");
+        inputCommands.push_back(Command {line.substr(0, space), stoi(line.substr(space+1))});
+    }
+
+    for(Command cmd : inputCommands) {
+        if(cmd.direction == "forward") {
+            x += cmd.distance;
+            y += cmd.distance * aim;
+        }
+        else if (cmd.direction == "down") {
+            aim += cmd.distance;
+        }
+        else if(cmd.direction == "up") {
+            aim -= cmd.distance;
+        }
+        else {
+            cout << "Uh I shouldn't get here in the for cmd loop" << endl;
+        }
+    }
+
+    cout << x * y << endl;
+
+    return 0;
+}