day01

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [{
+        "name": "g++.exe - Build and debug active file",
+        "type": "cppdbg",
+        "request": "launch",
+        "program": "${fileDirname}\\build\\${fileBasenameNoExtension}.exe",
+        "args": ["input/${fileBasenameNoExtension}.txt"],
+        "stopAtEntry": false,
+        "cwd": "${fileDirname}",
+        "environment": [],
+        "externalConsole": false,
+        "MIMode": "gdb",
+        "miDebuggerPath": "C:\\msys64\\mingw64\\bin\\gdb.exe",
+        "setupCommands": [{
+            "description": "Enable pretty-printing for gdb",
+            "text": "-enable-pretty-printing",
+            "ignoreFailures": true
+        }],
+        "preLaunchTask": "C/C++: g++.exe build active file"
+    }]
+}

.vscode/tasks.json

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+{
+    "tasks": [{
+        "type": "cppbuild",
+        "label": "C/C++: g++.exe build active file",
+        "command": "C:\\msys64\\mingw64\\bin\\g++.exe",
+        "args": [
+            "-fdiagnostics-color=always",
+            "-Wall",
+            "-g",
+            "${file}",
+            "-o",
+            "${fileDirname}\\build\\${fileBasenameNoExtension}.exe"
+        ],
+        "options": {
+            "cwd": "${fileDirname}"
+        },
+        "problemMatcher": [
+            "$gcc"
+        ],
+        "group": {
+            "kind": "build",
+            "isDefault": true
+        },
+        "detail": "Task generated by Debugger."
+    }],
+    "version": "2.0.0"
+}

2021/day01.cpp

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+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    if (argc <= 1) {
+        cerr << "No input file was given!" << endl;
+        return 1;
+    }
+    ifstream input;
+    input.open(argv[1]);
+    if (input.is_open()) {
+        vector<int> array;
+        int x, y, count;
+        while (input >> x) {
+            array.push_back(x);
+        }
+
+        count = 0;
+        for (unsigned int i = 0; i < array.size() - 1; ++i) {
+            if (array[i + 1] > array[i]) {
+                count++;
+            }
+        }
+        cout << count << endl;
+
+        count = 0;
+        for (unsigned int i = 0; i < array.size() - 3; ++i) {
+            y = array[i] + array[i + 1] + array[i + 2];
+            x = array[i + 1] + array[i + 2] + array[i + 3];
+            if (x > y) {
+                count++;
+            }
+        }
+        cout << count << endl;
+    }
+    else {
+        cerr << "Unable to open file!";
+        return 1;
+    }
+    input.close();
+    return 0;
+}