Day 17
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1 changed files with 199 additions and 6 deletions
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d17/main.cxx
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d17/main.cxx
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#include <string>
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#include <sstream>
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#include <chrono>
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#include <iostream>
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#include <iostream>
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#include <fstream>
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#include <unordered_map>
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#include <functional>
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#include <omp.h>
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using std::cout, std::endl;
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using std::cout, std::endl;
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int main() {
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constexpr const char content[] = {
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std::ifstream file{"../d17/input.txt"};
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#embed "input.txt"
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};
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enum class Opcode : int {
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ADV = 0,
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BXL,
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BST,
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JNZ,
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BXC,
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OUT,
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BDV,
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CDV
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};
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struct Registers {
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uint64_t A;
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uint64_t B;
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uint64_t C;
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uint64_t instruction_pointer;
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std::string rstdout = "";
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bool operator==(const Registers& other) const {
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return A == other.A && B == other.B && C == other.C && instruction_pointer == other.instruction_pointer && rstdout == other.rstdout;
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}
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};
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namespace std {
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template <>
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struct hash<Registers> {
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std::size_t operator()(const Registers& regs) const {
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return std::hash<uint64_t>{}(regs.A) ^ std::hash<uint64_t>{}(regs.B) ^ std::hash<uint64_t>{}(regs.C) ^ std::hash<std::string>{}(regs.rstdout);
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}
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};
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}
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constexpr uint64_t resolve_combo_operand(int operand, Registers& regs) {
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switch(operand) {
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case 0: return 0;
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case 1: return 1;
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case 2: return 2;
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case 3: return 3;
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case 4: return regs.A;
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case 5: return regs.B;
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case 6: return regs.C;
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default: exit(-1);
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};
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}
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std::unordered_map<Opcode, std::function<void(Registers& regs, int64_t operand)>> opcodes = {
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{Opcode::ADV, [](Registers& regs, int64_t operand) {
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regs.A /= std::pow(2, resolve_combo_operand(operand, regs));
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regs.instruction_pointer += 2;
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}},
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{Opcode::BXL, [](Registers& regs, int64_t operand) {
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regs.B ^= operand;
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regs.instruction_pointer += 2;
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}},
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{Opcode::BST, [](Registers& regs, int64_t operand) {
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regs.B = resolve_combo_operand(operand, regs) % 8;
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regs.instruction_pointer += 2;
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}},
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{Opcode::JNZ, [](Registers& regs, int64_t operand) {
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if(regs.A != 0) {
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if(regs.instruction_pointer == operand) {
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regs.instruction_pointer += 2;
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} else {
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regs.instruction_pointer = operand;
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}
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}
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}},
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{Opcode::BXC, [](Registers& regs, int64_t _) {
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regs.B ^= regs.C;
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regs.instruction_pointer += 2;
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}},
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{Opcode::OUT, [](Registers& regs, int64_t operand) {
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auto val_str = std::to_string(resolve_combo_operand(operand, regs) % 8);
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std::string to_print = "";
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for(int i = 0; i < val_str.size(); i++) {
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to_print += val_str[i];
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to_print += ',';
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}
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regs.rstdout += to_print;
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regs.instruction_pointer += 2;
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}},
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{Opcode::BDV, [](Registers& regs, int64_t operand) {
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regs.B = regs.A / std::pow(2, resolve_combo_operand(operand, regs));
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regs.instruction_pointer += 2;
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}},
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{Opcode::CDV, [](Registers& regs, int64_t operand) {
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regs.C = regs.A / std::pow(2, resolve_combo_operand(operand, regs));
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regs.instruction_pointer += 2;
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}}
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};
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std::string part_1() {
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std::istringstream input_stream(content);
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std::string line;
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std::string line;
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while (std::getline(file, line)) {
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Registers regs = {0, 0, 0, 0, ""};
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std::getline(input_stream, line);
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regs.A = std::stoll(line.substr(line.find(":") + 1));
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std::getline(input_stream, line);
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regs.B = std::stoll(line.substr(line.find(":") + 1));
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std::getline(input_stream, line);
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regs.C = std::stoll(line.substr(line.find(":") + 1));
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std::vector<int> program;
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getline(input_stream, line);
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getline(input_stream, line, ' ');
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while(getline(input_stream, line, ',')) {
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if(!line.empty()) program.push_back(std::stoi(line));
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}
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}
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auto prev_regs = regs;
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while(regs.instruction_pointer < program.size()) {
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auto opcode = static_cast<Opcode>(program[regs.instruction_pointer]);
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auto operand = program[regs.instruction_pointer + 1];
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opcodes[opcode](regs, operand);
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if(prev_regs == regs) {
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regs.rstdout.pop_back();
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break;
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}
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prev_regs = regs;
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}
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return regs.rstdout;
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}
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uint64_t part_2() {
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std::istringstream input_stream(content);
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std::string line;
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Registers target_regs = {0, 0, 0, 0, ""};
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std::getline(input_stream, line);
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target_regs.A = std::stoll(line.substr(line.find(":") + 1));
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std::getline(input_stream, line);
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target_regs.B = std::stoll(line.substr(line.find(":") + 1));
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std::getline(input_stream, line);
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target_regs.C = std::stoll(line.substr(line.find(":") + 1));
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std::vector<int> program;
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getline(input_stream, line);
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getline(input_stream, line, ' ');
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while(getline(input_stream, line, ',')) {
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if(!line.empty()) program.push_back(std::stoi(line));
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}
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for(auto i : program) {
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target_regs.rstdout += std::to_string(i) + ",";
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}
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target_regs.rstdout.pop_back();
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uint64_t a_init = std::pow(8, 15);
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while(a_init < std::pow(8, 16)){
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Registers regs = {a_init, 0, 0, 0, ""};
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auto prev_regs = regs;
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while(regs.instruction_pointer < program.size()) {
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auto opcode = static_cast<Opcode>(program[regs.instruction_pointer]);
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auto operand = program[regs.instruction_pointer + 1];
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opcodes[opcode](regs, operand);
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if(prev_regs == regs) {
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regs.rstdout.pop_back();
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break;
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}
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prev_regs = regs;
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}
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if(regs.rstdout == target_regs.rstdout) {
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break;
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}
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for(int i = 15; i >= 0; i--) {
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if(regs.rstdout[i*2] != target_regs.rstdout[i*2]) {
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a_init += std::pow(8, i);
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break;
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}
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}
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}
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return a_init;
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}
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int main() {
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std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
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auto p1_val = part_1();
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std::chrono::steady_clock::time_point middle = std::chrono::steady_clock::now();
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auto p2_val = part_2();
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std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
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cout << "Part 1: " << p1_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(middle - begin).count() << "µs)" << endl;
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cout << "Part 2: " << p2_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(end - middle).count() << "µs)" << endl;
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return 0;
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return 0;
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}
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}
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