diff --git a/day_20/CMakeLists.txt b/day_20/CMakeLists.txt new file mode 100644 index 0000000..3553324 --- /dev/null +++ b/day_20/CMakeLists.txt @@ -0,0 +1 @@ +aoc_day(20) diff --git a/day_20/lib/CMakeLists.txt b/day_20/lib/CMakeLists.txt new file mode 100644 index 0000000..d17dd1a --- /dev/null +++ b/day_20/lib/CMakeLists.txt @@ -0,0 +1 @@ +aoc_add_library() diff --git a/day_20/lib/maze.cpp b/day_20/lib/maze.cpp new file mode 100644 index 0000000..5cdc1e7 --- /dev/null +++ b/day_20/lib/maze.cpp @@ -0,0 +1,38 @@ +#include "maze.hpp" + +#include +#include + +namespace aoc::day_20 { + +/// @brief Parses the maze from the input +/// @param lines The input to parse +/// @return The parsed maze +auto parseMaze(std::vector lines) -> std::vector> { + std::vector> maze; + for (auto const & line : lines) { + std::vector row; + for (auto const & cell : line) { + switch (cell) { + case '#': + row.push_back(aoc::path_finding::maze_cell::WALL); + break; + case '.': + row.push_back(aoc::path_finding::maze_cell::EMPTY); + break; + case 'S': + row.push_back(aoc::path_finding::maze_cell::START); + break; + case 'E': + row.push_back(aoc::path_finding::maze_cell::END); + break; + default: + throw std::invalid_argument("Invalid cell type in maze"); + } + } + maze.push_back(row); + } + return maze; +} + +} // namespace aoc::day_20 \ No newline at end of file diff --git a/day_20/lib/maze.hpp b/day_20/lib/maze.hpp new file mode 100644 index 0000000..d56ec54 --- /dev/null +++ b/day_20/lib/maze.hpp @@ -0,0 +1,15 @@ +#pragma once + +#include +#include + +#include "../../shared/src/maze_cell.hpp" + +namespace aoc::day_20 { + +/// @brief Parses the maze from the input +/// @param lines The input to parse +/// @return The parsed maze +auto parseMaze(std::vector lines) -> std::vector>; + +} // namespace aoc::day_20 \ No newline at end of file diff --git a/day_20/src/CMakeLists.txt b/day_20/src/CMakeLists.txt new file mode 100644 index 0000000..cc1a654 --- /dev/null +++ b/day_20/src/CMakeLists.txt @@ -0,0 +1,2 @@ +aoc_add_executable() +configure_file(input.txt input.txt COPYONLY) diff --git a/day_20/src/input.txt b/day_20/src/input.txt new file mode 100644 index 0000000..9716b11 --- /dev/null +++ b/day_20/src/input.txt @@ -0,0 +1,141 @@ +############################################################################################################################################# +#.......#.........#.....#.....#...#...###...###.....###...#...###.....#.....#.......#.......#.....#...#####.....#...#...#...#...............# +#.#####.#.#######.#.###.#.###.#.#.#.#.###.#.###.###.###.#.#.#.###.###.#.###.#.#####.#.#####.#.###.#.#.#####.###.#.#.#.#.#.#.#.#############.# +#...#...#.......#.#...#.#...#.#.#...#...#.#...#...#.....#.#.#...#...#.#...#.#.....#.#...#...#.#...#.#...#...#...#.#...#.#.#.#...#...........# +###.#.#########.#.###.#.###.#.#.#######.#.###.###.#######.#.###.###.#.###.#.#####.#.###.#.###.#.###.###.#.###.###.#####.#.#.###.#.########### 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std::expected input = aoc::file_operations::read("input.txt"); + if (!input) [[unlikely]] { + std::println(stderr, "Could not open file: {}", input.error().message()); + return aoc::EXIT_CODE_IO_ERROR; + } + + auto grid = aoc::grid_processor::processLines(*input); + + if (!aoc::grid_processor::validateGrid(grid)) { + std::println(stderr, "Grid is not valid"); + return aoc::EXIT_CODE_DATA_ERROR; + } + + auto maze = aoc::day_20::parseMaze(grid); + + auto scoringFun = [](aoc::path_finding::Node const & a, aoc::path_finding::Node const & b) { return 1; }; + + // Part 1 + auto possible_cheats = aoc::path_finding::MazeSolver(maze, scoringFun).findPathUsingCheats(2); + + // Sort by saving + std::ranges::sort(possible_cheats, [](auto const & a, auto const & b) { return a.saving > b.saving; }); + + for (size_t i = 0; i < possible_cheats.size(); i++) { + if (possible_cheats[i].saving < 100) { + std::println("Found paths with a saving over 100: {}", i); + break; + } + } + + return aoc::EXIT_CODE_SUCCESS; +} diff --git a/day_20/test/CMakeLists.txt b/day_20/test/CMakeLists.txt new file mode 100644 index 0000000..f16edeb --- /dev/null +++ b/day_20/test/CMakeLists.txt @@ -0,0 +1 @@ +aoc_add_test() \ No newline at end of file diff --git a/day_6/lib/grid_parser.hpp b/day_6/lib/grid_parser.hpp index 5bc7f91..8047798 100644 --- a/day_6/lib/grid_parser.hpp +++ b/day_6/lib/grid_parser.hpp @@ -24,12 +24,8 @@ struct ParsedGrid { /// @brief Converts a character representation of direction to FacingDirection enum /// @param c The character to convert ('^', 'v', '<', '>') -/// @return The corresponding FacingDirection -/// @details Optimized using platform-specific implementations: -/// - MSVC: Uses switch with __assume(0) -/// - GCC/Clang: Uses computed goto for better performance +/// @return The corresponding FacingDirection value [[nodiscard]] constexpr auto charToGuardDirection(char c) -> FacingDirection { -#ifdef _MSC_VER switch (c) { case '^': return FacingDirection::Up; @@ -40,21 +36,8 @@ struct ParsedGrid { case '>': return FacingDirection::Right; default: - __assume(0); // Unreachable + std::unreachable(); } -#else // Use Computed goto's for GCC and Clang - static void * const jumpTable[] = {&&up, &&down, &&left, &&right}; - goto * jumpTable[c - '^']; - -up: - return FacingDirection::Up; -down: - return FacingDirection::Down; -left: - return FacingDirection::Left; -right: - return FacingDirection::Right; -#endif } /// @brief Checks if a character represents a guard diff --git a/shared/src/astar.cpp b/shared/src/astar.cpp index fca1366..6001c00 100644 --- a/shared/src/astar.cpp +++ b/shared/src/astar.cpp @@ -5,6 +5,8 @@ #include #include +#include "print_compatibility_layer.hpp" + namespace aoc::path_finding { bool Node::operator==(Node const & other) const { @@ -61,7 +63,52 @@ auto MazeSolver::findPath() -> PathResult { return result; } -/// @brief Find all paths in the maze with the same cost as the cheapest path +auto MazeSolver::findPathUsingCheats(size_t boostLength) -> std::vector { + std::vector results; + auto shortest = findPath(); + if (shortest.cost == -1) { + return {}; + } + // For every obstacle in the maze remove it and try to find a path + // If the path is shorter than the shortest path, add it to the results + // Then remove a neighbor of the obstacle and try to find a path + // If the path is shorter than the shortest path, add it to the results + + for (size_t y = 0; y < m_maze.size(); ++y) { + std::println("y: {} of {}", y, m_maze.size()); + for (size_t x = 0; x < m_maze[y].size(); ++x) { + if (m_maze[y][x] == maze_cell::WALL) { + m_maze[y][x] = maze_cell::EMPTY; + auto path = findPath(); + auto currentCost = shortest.cost; + if (path.cost != -1 && path.cost < shortest.cost) { + results.push_back({path.path, shortest.cost - path.cost}); + } + // Check if the neigbor is a wall as well + for (auto const & dir : {aoc::math::Direction::UP, aoc::math::Direction::RIGHT}) { + auto vec = aoc::math::getDirectionVector(dir); + auto new_pos = + aoc::math::vector_2d{static_cast(x), static_cast(y)} + vec; + if (isValid(new_pos)) { + if (m_maze[new_pos.y][new_pos.x] == maze_cell::WALL) { + m_maze[new_pos.y][new_pos.x] = maze_cell::EMPTY; + auto path = findPath(); + if (path.cost != -1 && path.cost < shortest.cost) { + results.push_back({path.path, shortest.cost - path.cost}); + } + m_maze[new_pos.y][new_pos.x] = maze_cell::WALL; + } + } + } + m_maze[y][x] = maze_cell::WALL; + } + } + } + + return results; +} + +// @brief Find all paths in the maze with the same cost as the cheapest path /// @return All paths in the maze with the same cost as the cheapest path auto MazeSolver::findPaths() -> std::vector { std::vector allPaths; diff --git a/shared/src/astar.hpp b/shared/src/astar.hpp index dfe24db..6b9c29e 100644 --- a/shared/src/astar.hpp +++ b/shared/src/astar.hpp @@ -31,6 +31,12 @@ struct Node { bool operator<(Node const & other) const; }; +/// @brief The result of the pathfinding +struct PathResultUsingCheats { + std::vector path; + int64_t saving; +}; + /// @brief The result of the pathfinding struct PathResult { std::vector path; @@ -52,6 +58,12 @@ class MazeSolver { /// @return All paths in the maze with the same cost as the cheapest path auto findPaths() -> std::vector; + /// @brief Find all paths in the maze where a temprorary boost allowing to walk through walls for a limited time is + /// used + /// @return All paths in the maze with a cheaper cost than the cheapest path without the boost and the number of + /// steps saved + auto findPathUsingCheats(size_t boostLength) -> std::vector; + private: /// @brief The maze to solve std::vector> m_maze;