Day 1

day1/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+# set the project name
+project(d1p1)
+
+# specify the C++ standard
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/input
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+
+# add the executable
+add_executable(d1p1 part1/main.cpp)
+add_executable(d1p2 part2/main.cpp)

day1/part1/main.cpp

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+#include <iostream>
+#include <fstream>
+
+using namespace std;
+
+int main() {
+    cout << "Advent of Code 2021 - Day 1 Part 1" << endl;
+
+    ifstream filein("input");
+    string line;
+    getline(filein, line);
+
+    int last = stoi(line);
+    int count = 0;
+
+    for (line; getline(filein, line); ) 
+    {
+        if(stoi(line) > last) {
+            count++;
+        }
+
+        last = stoi(line);
+    }
+
+    cout << count << endl;
+
+    return 0;
+}

day1/part2/main.cpp

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+#include <iostream>
+#include <fstream>
+#include <numeric>
+
+using namespace std;
+
+int main() {
+    cout << "Advent of Code 2021 - Day 1 Part 2" << endl;
+
+    ifstream filein("input");
+    string line;
+    int firstSlice[3], secondSlice[3];
+    
+    for(int i = 0; i < 3; i++) {
+        getline(filein, line);
+        firstSlice[i] = stoi(line);
+    }
+
+    int count = 0;
+
+    while (getline(filein, line)) 
+    {
+        for(int i = 1; i < 3; i++) {
+            secondSlice[i-1] = firstSlice[i];
+        }
+
+        secondSlice[2] = stoi(line);
+
+        if(accumulate(secondSlice,secondSlice+3, 0) > accumulate(firstSlice,firstSlice+3, 0)) {
+            count++;
+        }
+
+        copy(begin(secondSlice), end(secondSlice), begin(firstSlice));
+    }
+
+    cout << count << endl;
+
+    return 0;
+}