Added day 1 & day 2

.gitignore

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+build/
+.vscode/
+*.exe
+*.o

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+# set the project name
+project(AoC-2021)
+
+# specify the C++ standard
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# add the executable
+add_executable(01A "solutions/01A.cpp")
+add_executable(01B "solutions/01B.cpp")
+add_executable(02A "solutions/02A.cpp")
+add_executable(02B "solutions/02B.cpp")

solutions/01A.cpp

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+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+
+
+int main()
+{
+std::ifstream inputFile("../input/01.txt");
+std::string input;
+std::vector<int> values;
+   
+while(std::getline(inputFile, input))
+{
+  values.push_back(std::stoi(input));
+}
+
+inputFile.close();
+
+
+int increases = 0;
+for(auto i = 0; i < values.size() - 1; i++)
+{
+  increases += 1 * (values[i] < values[i+1]);
+}
+
+std::cout << increases << std::endl;
+
+return 0;
+}

solutions/01B.cpp

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+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <numeric>
+
+int main()
+{
+  std::ifstream inputFile("../input/01.txt");
+  std::string input;
+  std::vector<int> values;
+      
+  while(std::getline(inputFile, input))
+  {
+    values.push_back(std::stoi(input));
+  }
+
+  inputFile.close();
+
+  int increases = 0;
+  for(auto i = 0; i < values.size() - 3; i++)
+  {
+    increases += 1 * (values[i]+values[i+1]+values[i+2] < values[i+1]+values[i+2]+values[i+3]);
+  }
+
+  std::cout << increases << std::endl;
+
+  return 0;
+}
+

solutions/02A.cpp

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+#include <iostream>
+#include <fstream>
+#include <string>
+
+int main() 
+{
+  std::ifstream inputFile("../input/02.txt");
+  std::string input;
+  long h,d = 0;
+
+  while(std::getline(inputFile, input))
+  {
+    input.pop_back();
+    int val = input.back() - 48;
+
+    switch(input.front())
+    {
+      case 'f': h += val; break;
+      case 'u': d -= val; break;
+      case 'd': d += val; break;                    
+    }
+  }
+
+  inputFile.close();
+
+  std::cout << d*h << std::endl;
+
+  return 0;
+}

solutions/02B.cpp

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+#include <iostream>
+#include <fstream>
+#include <string>
+
+int main() 
+{
+  std::ifstream inputFile("../input/02.txt");
+  std::string input;
+  long h,d,a = 0;
+
+  while(std::getline(inputFile, input))
+  {
+    input.pop_back();
+    int val = input.back() - 48;
+
+    switch(input.front())
+    {
+      case 'f': d += a * val;
+                h += val; break;
+      case 'u': a -= val; break;
+      case 'd': a += val; break;                    
+    }
+  }
+
+  inputFile.close();
+
+  std::cout << d*h << std::endl;
+
+  return 0;
+}