Day 3 WIP

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.12)
 
 # set the project name
 project(AdventofCode2021)
@@ -9,3 +9,4 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 add_subdirectory(day1)
 add_subdirectory(day2)
+add_subdirectory(day3)

day1/CMakeLists.txt

@@ -1,5 +1,5 @@
 # set the project name
-project(d1p1)
+project(day2)
 
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input
      DESTINATION ${CMAKE_CURRENT_BINARY_DIR})

day2/CMakeLists.txt

@@ -1,5 +1,5 @@
 # set the project name
-project(d2p1)
+project(day1)
 
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input
      DESTINATION ${CMAKE_CURRENT_BINARY_DIR})

day3/CMakeLists.txt

@@ -0,0 +1,9 @@
+# set the project name
+project(day3)
+
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+
+# add the executable
+add_executable(d3p1 part1/main.cpp)
+add_executable(d3p2 part2/main.cpp)

day3/part1/main.cpp

@@ -0,0 +1,57 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+int main() {
+    cout << "Advent of Code 2021 - Day 3 Part 1" << endl;
+
+    unsigned char gamma[12] = {0};
+    unsigned char epsilon[12] = {0};
+
+    vector<vector<char>> inputBits;
+
+    ifstream filein("input");
+    for(string line; getline(filein, line);) {
+        vector<char> bits;
+        for(int i = 0; i < 12; i++) {
+            if (line[i] == '1') {
+                bits.push_back(1);
+            }
+            else {
+                bits.push_back(0);
+            }
+        }
+        inputBits.push_back(bits);
+    }
+
+    for(int x = 0; x < 12; x++) {
+        int greater = 0;
+        
+        for(int i = 0; i < inputBits.size(); i++) {
+            if(inputBits[i][x] == 1) {
+                greater++;
+            }
+        }
+
+        if(greater > (inputBits.size() / 2)) {
+            gamma[x] = 1;
+            epsilon[x] = 0;
+        } else {
+            gamma[x] = 0;
+            epsilon[x] = 1;
+        }
+    }
+
+    int asd = 0;
+
+    for(int x = 0; x < 12; x++) {
+        asd = asd << (int)gamma[x];
+    }
+    cout << asd << endl;
+
+    cout << epsilon << endl;
+
+    return 0;
+}

day3/part2/main.cpp

@@ -0,0 +1,43 @@
+#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;
+}