first three days

day1/CMakeLists.txt

@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.10)
+
+# Project name and version
+project(Day1 VERSION 1.0)
+
+# Set default build type
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Debug)
+endif()
+
+# 1. This is the critical line for Clangd. 
+# It generates the file clangd reads to know where headers are.
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Debug and Release flags
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g -O0 -Wall -Wextra")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+
+# Specify C standard
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Add include directory
+include_directories(${PROJECT_SOURCE_DIR}/include)
+
+# Add executable
+add_executable(${PROJECT_NAME} 
+    src/main.cpp
+)

day1/Makefile

@@ -0,0 +1,9 @@
+
+
+clear:
+	rm -rf build/*
+
+run:
+	cp input.txt build
+	cp input_test.txt build
+	cd build && cmake .. && make && ./Day1

day1/flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1756787288,
+        "narHash": "sha256-rw/PHa1cqiePdBxhF66V7R+WAP8WekQ0mCDG4CFqT8Y=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d0fc30899600b9b3466ddb260fd83deb486c32f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

day1/flake.nix

@@ -0,0 +1,58 @@
+{
+  description = "A Nix-flake-based C/C++ development environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      supportedSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forEachSupportedSystem =
+        f:
+        nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
+    in
+    {
+      devShells = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default =
+            pkgs.mkShell.override
+              {
+                # Override stdenv in order to change compiler:
+                # stdenv = pkgs.clangStdenv;
+              }
+
+              {
+                nativeBuildInputs = with pkgs; [
+                  pkg-config
+                ];
+                packages =
+                  with pkgs;
+                  [
+                    clang-tools
+                    cmake
+                    codespell
+                    cppcheck
+                    doxygen
+                    gtest
+                    lcov
+                    nodejs
+                    vscode-extensions.vadimcn.vscode-lldb
+                  ]
+                  ++ (if system == "aarch64-darwin" then [ ] else [ gdb ]);
+                CODELLDB_PATH = "${pkgs.vscode-extensions.vadimcn.vscode-lldb}/share/vscode/extensions/vadimcn.vscode-lldb/adapter/codelldb";
+              };
+        }
+      );
+    };
+}

day1/input_test.txt

@@ -0,0 +1,10 @@
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82

day1/src/main.cpp

@@ -0,0 +1,71 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+struct Instruction {
+  const char direction;
+  const int value;
+};
+
+std::vector<Instruction> parse_input_file(const std::string &path) {
+  std::ifstream file;
+  std::vector<Instruction> vec;
+  std::string line;
+
+  file.open(path);
+  if (file.is_open()) {
+    while (std::getline(file, line)) {
+      auto instr = line.at(0);
+      int value = std::stoi(line.substr(1));
+      vec.emplace_back(Instruction{instr, value});
+    }
+    file.close();
+  } else {
+    std::cout << "Failed to open file: " << path << std::endl;
+  }
+
+  return vec;
+}
+
+std::tuple<int, int> doit(const std::vector<Instruction> &instructions) {
+  int dial_val = 50;
+  int zero_counter_part1 = 0;
+  int zero_counter_part2 = 0;
+  for (const auto &instr : instructions) {
+    for (int i = 0; i < instr.value; i++) {
+      if (instr.direction == 'L') {
+        dial_val--;
+      } else {
+        dial_val++;
+      }
+
+      if (dial_val > 99)
+        dial_val = 0;
+      else if (dial_val < 0)
+        dial_val = 99;
+      if (dial_val == 0)
+        zero_counter_part2 += 1;
+    }
+    if (dial_val == 0)
+      zero_counter_part1 += 1;
+
+    std::cout << "dial_val: " << dial_val << std::endl;
+  }
+  return std::make_tuple(zero_counter_part1, zero_counter_part2);
+}
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    std::cout << "One argument required: input txt" << std::endl;
+  }
+
+  auto instructions = parse_input_file(argv[1]);
+
+  auto num_zeros = doit(instructions);
+
+  std::cout << "Number of times dial hits zero (part 1): "
+            << std::get<0>(num_zeros) << std::endl;
+  std::cout << "Number of times dial hits zero (part 2): "
+            << std::get<1>(num_zeros) << std::endl;
+  return 0;
+}