diff --git a/03/CMakeLists.txt b/03/CMakeLists.txt new file mode 100644 index 0000000..35e3f18 --- /dev/null +++ b/03/CMakeLists.txt @@ -0,0 +1,22 @@ +cmake_minimum_required(VERSION 3.10) +set(CMAKE_CXX_STANDARD 14) +set(CMAKE_CXX_STANDARD_REQUIRED True) +set(CMAKE_EXPORT_COMPILE_COMMANDS ON) +enable_language(CXX) + +project(AoC03) + +if(APPLE) + include_directories(/usr/local/include) + link_directories(/usr/local/lib) +endif() + +if(WIN32) + add_executable(${CMAKE_PROJECT_NAME} WIN32) +else() + add_executable(${CMAKE_PROJECT_NAME}) +endif() + +target_sources(${CMAKE_PROJECT_NAME} + PRIVATE main.cpp + ) diff --git a/03/input b/03/input new file mode 100644 index 0000000..ac22a69 --- /dev/null +++ b/03/input @@ -0,0 +1,1000 @@ +011001101000 +010101111100 +000000111101 +001001001010 +010011000001 +111111001110 +001011101111 +110011010110 +100011111110 +101110000111 +000011011100 +001111111011 +011101001111 +111001010110 +011100011110 +001011000010 +100010111011 +000101010011 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+#include + +class Diagnostics { +public: + Diagnostics(size_t report_size) { + most_common.resize(report_size); + } + ~Diagnostics() = default; + + void addReport(const std::string &report) { + reports.push_back(report); + for (size_t i = 0; i < report.length(); i++) { + switch (report[i]) { + case '0': + most_common[i].first += 1; + break; + case '1': + most_common[i].second += 1; + default: + break; + } + } + } + + int getPowerConsumption() const { + return getGammaRate() * getEpsilonRate(); + } + + int getLifeSupportRating() const { + return getOxygenRating() * getCO2Rating(); + } + +private: + int getGammaRate() const { + return getRate(true); + } + + int getEpsilonRate() const { + return getRate(false); + } + + int getRate(bool gamma) const { + std::vector rate{}; + for (size_t i = 0; i < most_common.size(); i++) { + if (gamma) { + rate.push_back(getMostCommon(i)); + } else { + rate.push_back(getLeastCommon(i)); + } + } + return binaryToDecimal(rate); + } + int binaryToDecimal(const std::vector &binary) const { + int result = 0; + int multiplier = 1; + for (size_t i = binary.size() - 1; i > 0; i--) { + result += multiplier * binary[i]; + multiplier *= 2; + } + result += multiplier * binary[0]; + return result; + } + int binaryToDecimal(const std::string &binary) const { + std::vector binary_vec{}; + for (auto &bit : binary) { + switch (bit) { + case '0': + binary_vec.push_back(0); + break; + case '1': + binary_vec.push_back(1); + default: + break; + } + } + return binaryToDecimal(binary_vec); + } + int getMostCommon(int index) const { + if (most_common[index].first > most_common[index].second) { + return 0; + } + return 1; + } + int getLeastCommon(int index) const { + return (getMostCommon(index) + 1) % 2; + } + + std::unordered_set getInitialOptions() const { + std::unordered_set options{}; + for (size_t i = 0; i < reports.size(); i++) { + options.insert(i); + } + return options; + } + + int getOxygenRating() const { + return getPart2Rating(true); + } + + int getCO2Rating() const { + return getPart2Rating(false); + } + + int getPart2Rating(bool oxygen) const { + auto options = getInitialOptions(); + std::unordered_set to_remove{}; + size_t cmp_index = 0; + while (options.size() != 1) { + for (auto &option : options) { + if ((oxygen && reports[option][cmp_index] != + getMostCommonChar(options, cmp_index)) || + (!oxygen && reports[option][cmp_index] != + getLeastCommonChar(options, cmp_index))) { + to_remove.insert(option); + } + } + for (auto &remove : to_remove) { + options.erase(remove); + } + to_remove.clear(); + cmp_index++; + } + return binaryToDecimal(reports[*options.begin()]); + } + + char getMostCommonChar(const std::unordered_set &options, + int index) const { + int zeros = 0; + int ones = 0; + for (auto &option : options) { + if (reports[option][index] == '0') { + zeros += 1; + } else { + ones += 1; + } + } + if (zeros > ones) { + return '0'; + } + return '1'; + } + char getLeastCommonChar(const std::unordered_set &options, + int index) const { + if (getMostCommonChar(options, index) == '0') { + return '1'; + } + return '0'; + } + std::vector reports; + std::vector> most_common; +}; + +Diagnostics getDiagnostics(const std::string &file_name) { + std::ifstream file(file_name); + std::string tmp{}; + std::string str; + std::getline(file, str); + Diagnostics result(str.length()); + do { + std::stringstream ss(str); + ss >> tmp; + result.addReport(tmp); + } while (std::getline(file, str)); + return result; +} + +int part1(const Diagnostics &diagnostics) { + return diagnostics.getPowerConsumption(); +} + +int part2(const Diagnostics &diagnostics) { + return diagnostics.getLifeSupportRating(); +} + +int main(int argc, char **argv) { + if (argc < 2) { + std::cerr << "You must provide input file!" << std::endl; + return 1; + } + auto diagnostics = getDiagnostics(argv[1]); + std::cout << "The submarine's power conusmption is \033[91;1m" + << part1(diagnostics) << "\033[0m." << std::endl; + std::cout << "The submarine's life support rating is \033[91;1m" + << part2(diagnostics) << "\033[0m." << std::endl; + return 0; +}