16
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16/CMakeLists.txt
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22
16/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(AoC16)
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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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1
16/input
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1
16/input
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311
16/main.cpp
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311
16/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 <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 Packet {
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public:
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Packet(int version, int type) : _version(version), _type(type) {}
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void setValue(uint64_t value) {
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_has_value = true;
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_value = value;
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}
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void addSubPacket(Packet p) {
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_subs.push_back(std::move(p));
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}
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int getVersion() const {
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return _version;
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}
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int getType() const {
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return _type;
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}
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uint64_t getValue() const {
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return _value;
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}
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bool hasSubs() const {
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return _subs.size() != 0;
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}
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const std::vector<Packet> &getSubs() const {
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return _subs;
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}
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std::vector<Packet> &getSubs() {
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return _subs;
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}
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bool hasValue() const {
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return _has_value;
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}
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private:
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int _version;
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int _type;
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uint64_t _value{};
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bool _has_value = false;
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std::vector<Packet> _subs{};
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};
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uint8_t getBitsFromChar(const char &c) {
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switch (c) {
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case 'A':
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return 0b1010;
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case 'B':
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return 0b1011;
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case 'C':
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return 0b1100;
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case 'D':
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return 0b1101;
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case 'E':
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return 0b1110;
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case 'F':
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return 0b1111;
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default:
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return c - '0';
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}
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}
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std::vector<uint8_t> getBits(const std::string &file_name) {
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std::vector<uint8_t> bits;
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std::ifstream file(file_name);
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std::string str;
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std::getline(file, str);
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if (str.length() % 2 == 1) {
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bits.resize(str.length() / 2 + 1);
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} else {
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bits.resize(str.length() / 2);
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}
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for (size_t i = 0; i < str.length() / 2; i++) {
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bits[i] |= getBitsFromChar(str[i * 2]);
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bits[i] <<= 4;
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bits[i] |= getBitsFromChar(str[i * 2 + 1]);
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}
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if (str.length() % 2 == 1) {
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bits.back() |= getBitsFromChar(str.back());
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bits.back() <<= 4;
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}
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return bits;
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}
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uint8_t getBit(const std::vector<uint8_t> &bits, uint64_t bitpos) {
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auto ind = bitpos / 8;
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auto bit = bitpos % 8;
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uint8_t comparator = 0;
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switch (bit) {
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case 0:
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comparator = 0b10000000;
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break;
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case 1:
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comparator = 0b01000000;
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break;
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case 2:
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comparator = 0b00100000;
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break;
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case 3:
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comparator = 0b00010000;
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break;
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case 4:
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comparator = 0b00001000;
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break;
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case 5:
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comparator = 0b00000100;
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break;
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case 6:
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comparator = 0b00000010;
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break;
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case 7:
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comparator = 0b00000001;
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break;
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}
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return bits[ind] & comparator ? 1 : 0;
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}
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std::pair<uint64_t, uint64_t> getPacketValue(const std::vector<uint8_t> &bits,
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uint64_t size, uint64_t bitpos) {
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uint64_t result = 0;
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auto length = bitpos + size;
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while (bitpos < length) {
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uint8_t group = 0;
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for (int i = 0; i < 5; i++) {
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group <<= 1;
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group |= getBit(bits, bitpos);
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bitpos++;
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}
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result <<= 4;
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result |= group & 0b00001111;
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if (!(group & 0b00010000)) {
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break;
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}
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}
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return { bitpos, result };
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}
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std::pair<uint64_t, Packet> bitsToPacket(const std::vector<uint8_t> &bits,
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uint64_t start, uint64_t size) {
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int version = 0;
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version |= getBit(bits, start);
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version <<= 1;
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version |= getBit(bits, start + 1);
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version <<= 1;
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version |= getBit(bits, start + 2);
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int type = 0;
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type |= getBit(bits, start + 3);
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type <<= 1;
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type |= getBit(bits, start + 4);
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type <<= 1;
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type |= getBit(bits, start + 5);
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auto length = start + size;
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uint64_t end = 0;
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Packet result(version, type);
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switch (type) {
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case 4: {
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auto res = getPacketValue(bits, size - 6, start + 6);
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result.setValue(res.second);
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end = res.first;
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} break;
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default:
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if (getBit(bits, start + 6)) {
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uint16_t count = 0;
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for (int i = 0; i < 11; i++) {
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count <<= 1;
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count |= getBit(bits, start + 7 + i);
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}
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auto new_start = start + 7 + 11;
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for (int i = 0; i < count; i++) {
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auto res = bitsToPacket(bits, new_start, length - new_start);
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new_start = res.first;
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result.addSubPacket(std::move(res.second));
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}
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end = new_start;
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} else {
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uint16_t size = 0;
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for (int i = 0; i < 15; i++) {
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size <<= 1;
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size |= getBit(bits, start + 7 + i);
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}
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auto new_start = start + 7 + 15;
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auto sub_end = start + 7 + 15 + size;
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while (new_start < sub_end) {
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auto res = bitsToPacket(bits, new_start, size);
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size -= res.first - new_start;
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new_start = res.first;
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result.addSubPacket(std::move(res.second));
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}
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end = new_start;
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}
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break;
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}
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return { end, result };
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}
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uint64_t versionSum(const Packet &packet) {
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uint64_t sum = packet.getVersion();
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if (packet.hasSubs()) {
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for (auto &sub : packet.getSubs()) {
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sum += versionSum(sub);
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}
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}
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return sum;
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}
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uint64_t part1(const Packet &packet) {
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return versionSum(packet);
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}
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uint64_t calculatePacket(Packet &packet) {
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if (packet.hasValue()) {
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return packet.getValue();
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}
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uint64_t result = 0;
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switch (packet.getType()) {
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case 0:
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result = 0;
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for (auto &sub : packet.getSubs()) {
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result += calculatePacket(sub);
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}
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break;
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case 1:
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result = 1;
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for (auto &sub : packet.getSubs()) {
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result *= calculatePacket(sub);
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}
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break;
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case 2:
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result = -1;
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for (auto &sub : packet.getSubs()) {
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auto calc = calculatePacket(sub);
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if (calc < result) {
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result = calc;
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}
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}
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break;
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case 3:
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result = 0;
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for (auto &sub : packet.getSubs()) {
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auto calc = calculatePacket(sub);
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if (calc > result) {
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result = calc;
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}
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}
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break;
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case 4:
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result = packet.getValue();
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break;
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case 5:
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result = calculatePacket(packet.getSubs()[0]) >
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calculatePacket(packet.getSubs()[1])
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? 1
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: 0;
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break;
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case 6:
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result = calculatePacket(packet.getSubs()[0]) <
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calculatePacket(packet.getSubs()[1])
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? 1
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: 0;
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break;
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case 7:
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result = calculatePacket(packet.getSubs()[0]) ==
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calculatePacket(packet.getSubs()[1])
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? 1
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: 0;
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break;
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default:
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break;
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}
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packet.setValue(result);
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return result;
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}
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uint64_t part2(Packet &packet) {
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return calculatePacket(packet);
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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 bits = getBits(argv[1]);
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auto packet = bitsToPacket(bits, 0, bits.size() * 8).second;
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std::cout << "Sum of all packet's versions is \033[91;1m" << part1(packet)
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<< "\033[0m." << std::endl;
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std::cout << "The resulting value of the outermost packet is \033[91;1m"
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<< part2(packet) << "\033[0m." << std::endl;
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return 0;
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}
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