20
This commit is contained in:
parent
b6f3a500c2
commit
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22
20/CMakeLists.txt
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22
20/CMakeLists.txt
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cmake_minimum_required(VERSION 3.10)
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set(CMAKE_CXX_STANDARD 14)
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set(CMAKE_CXX_STANDARD_REQUIRED True)
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set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
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enable_language(CXX)
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project(AoC20)
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if(APPLE)
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include_directories(/usr/local/include)
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link_directories(/usr/local/lib)
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endif()
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if(WIN32)
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add_executable(${CMAKE_PROJECT_NAME} WIN32)
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else()
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add_executable(${CMAKE_PROJECT_NAME})
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endif()
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target_sources(${CMAKE_PROJECT_NAME}
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PRIVATE main.cpp
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)
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102
20/input
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102
20/input
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147
20/main.cpp
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147
20/main.cpp
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#include <fstream>
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#include <iostream>
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#include <sstream>
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#include <vector>
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#include <array>
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class Image {
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public:
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Image(size_t width, size_t height) {
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image.resize(height);
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for(auto &x : image) {
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x.resize(width);
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}
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}
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Image(const std::vector<std::vector<bool>> &input) : image(std::move(input)) {}
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void setPixel(size_t x, size_t y, bool pixel) {
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image[y][x] = pixel;
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}
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bool getPixel(size_t x, size_t y) const {
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return image[y][x];
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}
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void setOutsidePixelState(bool pixel) {
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outside = pixel;
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}
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bool getOutsidePixelState() const {
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return outside;
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}
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size_t getImageWidth() const {
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return image[0].size();
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}
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size_t getImageHeight() const {
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return image.size();
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}
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size_t getLitPixels() const {
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size_t pixels = 0;
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for(auto &line : image) {
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for(auto pixel : line) {
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if(pixel) {
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pixels++;
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}
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}
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}
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return pixels;
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}
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bool getNewPixel(const std::array<bool, 512> &algorithm, int64_t x, int64_t y) const {
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uint16_t index = 0;
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for(int y_add = -1; y_add <= 1; y_add++) {
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for(int x_add = -1; x_add <= 1; x_add++) {
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index <<= 1;
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auto new_y = y + y_add;
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auto new_x = x + x_add;
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if(new_y < 0 || new_x < 0 || new_y >= getImageHeight() || new_x >= getImageWidth()) {
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if(getOutsidePixelState()) {
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index |= 0b1;
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}
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} else {
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if(getPixel(new_x, new_y)) {
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index |= 0b1;
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}
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}
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}
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}
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return algorithm[index];
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}
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void printImage() const {
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for(auto &line : image) {
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for(auto pixel : line) {
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std::cout << (pixel ? '#' : '.');
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}
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std::cout << std::endl;
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}
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}
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private:
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bool outside = false;
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std::vector<std::vector<bool>> image;
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};
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std::pair<std::array<bool, 512>, Image> getInput(const std::string &file_name) {
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std::ifstream file(file_name);
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std::array<bool, 512> algorithm{};
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std::vector<std::vector<bool>> image_data{};
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int tmp = 0;
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std::string str;
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std::getline(file, str);
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for(size_t i = 0; i < 512; i++) {
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if(str[i] == '#') {
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algorithm[i] = true;
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} else {
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algorithm[i] = false;
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}
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}
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std::getline(file, str);
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while (std::getline(file, str)) {
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image_data.emplace_back();
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for(auto &c : str) {
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if(c == '#') {
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image_data.back().push_back(true);
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} else {
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image_data.back().push_back(false);
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}
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}
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}
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auto image = Image(image_data);
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return {algorithm, image};
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}
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Image applyAlgorithm(const std::array<bool, 512> &algorithm, const Image &startingImage) {
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Image newImage(startingImage.getImageWidth() + 2, startingImage.getImageHeight() + 2);
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for(int64_t x = 0; x < newImage.getImageWidth(); x++) {
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for(int64_t y = 0; y < newImage.getImageHeight(); y++) {
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auto startingX = x - 1;
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auto startingY = y - 1;
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auto nextPixel = startingImage.getNewPixel(algorithm, startingX, startingY);
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newImage.setPixel(x, y, nextPixel);
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}
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}
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newImage.setOutsidePixelState(algorithm[startingImage.getOutsidePixelState() ? 511 : 0]);
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return newImage;
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}
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|
||||
size_t part1(const std::array<bool, 512> &algorithm, Image image) {
|
||||
for(int i = 0; i < 2; i++) {
|
||||
image = applyAlgorithm(algorithm, image);
|
||||
}
|
||||
return image.getLitPixels();
|
||||
}
|
||||
|
||||
size_t part2(const std::array<bool, 512> &algorithm, Image image) {
|
||||
for(int i = 0; i < 50; i++) {
|
||||
image = applyAlgorithm(algorithm, image);
|
||||
}
|
||||
return image.getLitPixels();
|
||||
}
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
if (argc < 2) {
|
||||
std::cerr << "You must provide input file!" << std::endl;
|
||||
return 1;
|
||||
}
|
||||
auto input = getInput(argv[1]);
|
||||
std::cout << "There are \033[91;1m" << part1(input.first, input.second)
|
||||
<< "\033[0m lit pixels after 2 applies." << std::endl;
|
||||
std::cout << "There are \033[91;1m" << part2(input.first, input.second)
|
||||
<< "\033[0m window depth increases." << std::endl;
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user