19
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19/CMakeLists.txt
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22
19/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(AoC19)
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if(APPLE)
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include_directories(/opt/homebrew/include)
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link_directories(/opt/homebrew/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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297
19/main.cpp
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19/main.cpp
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#include <algorithm>
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#include <deque>
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#include <fstream>
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#include <iostream>
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#include <memory>
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#include <sstream>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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class BeaconPos {
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public:
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BeaconPos() = delete;
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BeaconPos(int x, int y, int z): _x(x), _y(y), _z(z) {}
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int getX() const {
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return _x;
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}
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int getY() const {
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return _y;
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}
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int getZ() const {
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return _z;
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}
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void setX(int x) {
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_x = x;
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}
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void setY(int y) {
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_y = y;
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}
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void setZ(int z) {
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_z = z;
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}
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friend std::ostream& operator<<(std::ostream& stream, const BeaconPos& pos) {
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stream << pos.getX() << ", " << pos.getY() << ", " << pos.getZ();
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return stream;
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}
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friend bool operator==(const BeaconPos &pos1, const BeaconPos &pos2) {
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return pos1.getX() == pos2.getX() && pos1.getY() == pos2.getY() && pos1.getZ() == pos2.getZ();
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}
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friend bool operator!=(const BeaconPos &pos1, const BeaconPos &pos2) {
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return !(pos1 == pos2);
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}
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BeaconPos& operator+=(const BeaconPos& pos2) {
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setX(getX() + pos2.getX());
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setY(getY() + pos2.getY());
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setZ(getZ() + pos2.getZ());
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return *this;
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}
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friend BeaconPos operator+(BeaconPos pos1, const BeaconPos &pos2) {
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pos1 += pos2;
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return pos1;
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}
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BeaconPos& operator-=(const BeaconPos& pos2) {
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setX(getX() - pos2.getX());
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setY(getY() - pos2.getY());
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setZ(getZ() - pos2.getZ());
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return *this;
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}
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friend BeaconPos operator-(BeaconPos pos1, const BeaconPos &pos2) {
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pos1 -= pos2;
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return pos1;
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}
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private:
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// X possitive - right, negative - left
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int _x;
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// Y positive - top, negative - bottom
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int _y;
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// Z positive - further back, negative - closer
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int _z;
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};
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static std::vector<std::function<BeaconPos(const BeaconPos&)>> transformFunctions = {
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[](const BeaconPos &beacon) {return beacon;},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getZ(), beacon.getY(), -beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getX(), beacon.getY(), -beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getZ(), beacon.getY(), beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getX(), -beacon.getY(), beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getZ(), -beacon.getY(), -beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getX(), -beacon.getY(), -beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getZ(), -beacon.getY(), beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getX(), -beacon.getZ(), beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getY(), -beacon.getZ(), -beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getX(), -beacon.getZ(), -beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getY(), -beacon.getZ(), beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getX(), beacon.getZ(), -beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getY(), beacon.getZ(), -beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getX(), beacon.getZ(), beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getY(), beacon.getZ(), beacon.getX());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getZ(), beacon.getX(), beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getY(), beacon.getX(), -beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getZ(), beacon.getX(), -beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getY(), beacon.getX(), beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getZ(), -beacon.getX(), beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getY(), -beacon.getX(), beacon.getZ());},
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[](const BeaconPos &beacon) {return BeaconPos(beacon.getZ(), -beacon.getX(), -beacon.getY());},
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[](const BeaconPos &beacon) {return BeaconPos(-beacon.getY(), -beacon.getX(), -beacon.getZ());},
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};
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class BeaconMap {
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public:
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BeaconMap() {}
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void addBeacon(int x, int y, int z) {
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addBeacon(BeaconPos(x, y, z));
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}
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void addBeacon(BeaconPos beacon) {
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_map.push_back(beacon);
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}
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void generateRelativeBeacons(bool transform) {
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_relative_map.clear();
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_relative_map.emplace_back();
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for(size_t i = 0; i < _map.size(); i++) {
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_relative_map.back().push_back(std::vector<BeaconPos>());
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for(size_t j = 0; j < _map.size(); j++) {
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_relative_map.back().back().emplace_back(_map[j].getX() - _map[i].getX(), _map[j].getY() - _map[i].getY(), _map[j].getZ() - _map[i].getZ());
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}
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}
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if(transform) {
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for(size_t i = 1; i < transformFunctions.size(); i++) {
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_relative_map.emplace_back();
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for(auto &vec : _relative_map[0]) {
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_relative_map.back().emplace_back();
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for(auto &value : vec) {
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_relative_map.back().back().push_back(transformFunctions[i](value));
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}
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}
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}
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}
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}
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std::pair<BeaconPos, int> has12Common(const BeaconMap &other) {
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auto otherRelativeBeacons = other._relative_map[0];
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for(size_t transformIndex = 0; transformIndex < _relative_map.size(); transformIndex++) {
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for(auto &mybeaconmap : _relative_map[transformIndex]) {
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int commonBeacons = 0;
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for(auto &otherBeaconMap : otherRelativeBeacons) {
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commonBeacons = 0;
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for(auto &myBeacon : mybeaconmap) {
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if(std::find(otherBeaconMap.begin(), otherBeaconMap.end(), myBeacon) != otherBeaconMap.end()) {
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commonBeacons++;
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}
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}
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if(commonBeacons >= 11) {
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size_t otherIndex = 0;
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size_t myIndex = 0;
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for(size_t i = 0; i < otherBeaconMap.size(); i++) {
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if(otherBeaconMap[i].getX() == 0 && otherBeaconMap[i].getY() == 0 && otherBeaconMap[i].getZ() == 0) {
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otherIndex = i;
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break;
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}
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}
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for(size_t i = 0; i < otherBeaconMap.size(); i++) {
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if(mybeaconmap[i].getX() == 0 && mybeaconmap[i].getY() == 0 && mybeaconmap[i].getZ() == 0) {
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myIndex = i;
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break;
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}
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}
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return {other._map[otherIndex] - transformFunctions[transformIndex](_map[myIndex]), transformIndex};
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}
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}
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}
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}
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return {{0,0,0}, -1};
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}
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size_t getNumberOfBeacons() const {
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return _map.size();
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}
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void copyBeacons(const BeaconMap &map, BeaconPos relativePosition) {
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for(const auto &beacon : map._map) {
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auto repositioned = beacon + relativePosition;
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if(hasBeacon(repositioned)) {
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continue;
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} else {
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addBeacon(repositioned);
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}
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}
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}
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void updateMap(int transformIndex) {
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for(auto &beacon : _map) {
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beacon = transformFunctions[transformIndex](beacon);
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}
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}
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private:
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bool hasBeacon(BeaconPos beacon) {
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return std::find(_map.begin(), _map.end(), beacon) != _map.end();
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}
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std::vector<BeaconPos> _map;
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std::vector<std::vector<std::vector<BeaconPos>>> _relative_map;
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};
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std::vector<BeaconMap>
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getBeaconMaps(const std::string &file_name) {
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std::vector<BeaconMap> beaconMaps{};
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std::ifstream file(file_name);
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std::string str;
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while (std::getline(file, str)) {
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if(str[1] == '-') {
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auto cur = BeaconMap();
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beaconMaps.push_back(cur);
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continue;
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}
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if(str.empty()) {
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continue;
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}
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std::istringstream ss(str);
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int x, y, z;
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char delimiter;
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ss >> x;
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ss >> delimiter;
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ss >> y;
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ss >> delimiter;
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ss >> z;
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BeaconPos bp(x, y, z);
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beaconMaps.back().addBeacon(x, y, z);
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}
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beaconMaps[0].generateRelativeBeacons(false);
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for(size_t i = 1; i < beaconMaps.size(); i++) {
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beaconMaps[i].generateRelativeBeacons(true);
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}
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return beaconMaps;
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}
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std::pair<uint64_t, std::vector<BeaconPos>> part1(std::vector<BeaconMap> maps) {
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std::vector<BeaconPos> scanners{};
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std::deque<size_t> mapIndexes{};
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for(size_t i = 1; i < maps.size(); i++) {
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mapIndexes.push_back(i);
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}
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while(!mapIndexes.empty()) {
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auto prevCount = mapIndexes.size();
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for(auto iterator = mapIndexes.begin(); iterator != mapIndexes.end(); iterator++) {
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auto result = maps[*iterator].has12Common(maps[0]);
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if(result.second >= 0) {
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scanners.push_back(result.first);
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maps[*iterator].updateMap(result.second);
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maps[0].copyBeacons(maps[*iterator], result.first);
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mapIndexes.erase(iterator);
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maps[0].generateRelativeBeacons(false);
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break;
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}
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}
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if(prevCount == mapIndexes.size()) {
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std::cerr << "Cannot find all beacons";
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return {-1, {}};
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}
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}
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return {maps[0].getNumberOfBeacons(), scanners};
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}
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uint64_t part2(std::vector<BeaconPos> &scanners) {
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size_t maxManhattan = 0;
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for(size_t i = 0; i < scanners.size(); i++) {
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for(size_t j = i; j < scanners.size(); j++) {
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auto diff = scanners[i] - scanners[j];
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auto manhattan = abs(diff.getX()) + abs(diff.getY()) + abs(diff.getZ());
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if(manhattan > maxManhattan) {
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maxManhattan = manhattan;
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}
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}
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}
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return maxManhattan;
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}
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int main(int argc, char **argv) {
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if (argc < 2) {
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std::cerr << "You must provide input file!" << std::endl;
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return 1;
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}
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auto maps = getBeaconMaps(argv[1]);
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auto result = part1(maps);
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std::cout << "The number of beacons mapped in the ocean is \033[91;1m" << result.first
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<< "\033[0m." << std::endl;
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std::cout
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<< "The largest manhattan distance between any 2 scanners is \033[91;1m"
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<< part2(result.second) << "\033[0m." << std::endl;
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return 0;
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}
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