day 24 part 1 in progress

Author: K20shores

2024/src/CMakeLists.txt

@@ -34,6 +34,7 @@ create_standard_test(NAME 2024_day20 SOURCES day20.cpp LIBRARIES aoc2024)
 create_standard_test(NAME 2024_day21 SOURCES day21.cpp LIBRARIES aoc2024)
 create_standard_test(NAME 2024_day22 SOURCES day22.cpp LIBRARIES aoc2024)
 create_standard_test(NAME 2024_day23 SOURCES day23.cpp LIBRARIES aoc2024)
+create_standard_test(NAME 2024_day24 SOURCES day24.cpp LIBRARIES aoc2024)
 
 ################################################################################
 # Copy input data

2024/src/day24.cpp

@@ -0,0 +1,246 @@
+#include <iostream>
+#include <filesystem>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <benchmark/benchmark.h>
+#include <format>
+#include <aoc/2024/split.h>
+
+enum Gate {
+  AND,
+  OR,
+  XOR
+};
+
+std::string gate_to_string(Gate gate) {
+  switch(gate) {
+    case Gate::AND:
+      return "AND";
+    case Gate::OR:
+      return "OR";
+    case Gate::XOR:
+      return "XOR";
+    default:
+      break;
+  }
+  return "unknown";
+}
+
+struct Operation {
+  Gate gate;
+  std::string arg1;
+  std::string arg2;
+  std::string target;
+};
+
+struct Data {
+  std::map<std::string, int> gates;
+  std::vector<Operation> operations;
+};
+
+bool has_both_inputs(const Operation& op, const std::map<std::string, int>& gates) {
+  return gates.at(op.arg1) != -1 && gates.at(op.arg2) != -1;
+}
+
+void put_valid_gates_first(std::vector<Operation>& operations, const std::map<std::string, int>& gates, size_t offset = 0) {
+  std::sort(operations.begin() + offset, operations.end(), [&](const Operation& a, const Operation& b) {
+    int valid_args_a = 0;
+    valid_args_a += gates.at(a.arg1) != -1;
+    valid_args_a += gates.at(a.arg2) != -1;
+    int valid_args_b = 0;
+    valid_args_b += gates.at(b.arg1) != -1;
+    valid_args_b += gates.at(b.arg2) != -1;
+    return valid_args_a > valid_args_b;
+  });
+}
+
+int64_t form_number(const std::map<std::string, int>& gates) {
+  int idx = 0;
+  int64_t result = 0;
+  for(auto& [gate, value] : gates) {
+    if (gate[0] == 'z') {
+      std::cout << std::format("  {} {}\n", gate, value);
+      result |= value << idx;
+      ++idx;
+    }
+  }
+  return result;
+}
+
+int64_t part1(const Data &data)
+{
+  auto operations = data.operations;
+  auto gates = data.gates;
+
+  for(auto& [gate, value] : gates) {
+    std::cout << gate << " " << value << std::endl;
+  }
+
+  for(auto& op : operations) {
+    std::cout << std::format("{} {} {} -> {}\n", op.arg1, gate_to_string(op.gate), op.arg2, op.target);
+  }
+  std::cout << std::endl;
+
+  put_valid_gates_first(operations, gates);
+
+  for(auto& op : operations) {
+    std::cout << std::format("{} {} {} -> {}\n", op.arg1, gate_to_string(op.gate), op.arg2, op.target);
+  }
+  std::cout << std::endl;
+
+  for(size_t i = 0; i < operations.size(); ++i) {
+    auto& op = operations[i];
+    if (has_both_inputs(op, gates)) {
+      int arg1 = data.gates.at(op.arg1);
+      int arg2 = data.gates.at(op.arg2);
+      int result = 0;
+      switch(op.gate) {
+        case Gate::AND:
+          result = arg1 & arg2;
+          break;
+        case Gate::OR:
+          result = arg1 | arg2;
+          break;
+        case Gate::XOR:
+          result = arg1 ^ arg2;
+          break;
+        default:
+          break;
+      }
+      gates[op.target] = result;
+    }
+    else {
+      put_valid_gates_first(operations, gates, i);
+      // --i;
+    }
+  }
+  for(auto& [gate, value] : gates) {
+    std::cout << gate << " " << value << std::endl;
+  }
+  std::cout << std::endl;
+  return form_number(gates);
+}
+
+int part2(const Data &data)
+{
+  return 0;
+}
+
+Data parse()
+{
+  std::ifstream file(std::filesystem::path("inputs/day24.txt"));
+  if (!file.is_open())
+  {
+    throw std::runtime_error("file not found");
+  }
+  std::string line;
+  Data data;
+
+  bool gates = false;
+  while (std::getline(file, line))
+  {
+    if (line.empty())
+    {
+      gates = true;
+      continue;
+    }
+    if (!gates)
+    {
+      auto parts = split(line, ": ");
+      data.gates[parts[0]] = std::stoi(parts[1]);
+    }
+    else
+    {
+      auto parts = split(line, " ");
+      Operation op;
+      op.arg1 = parts[0];
+      op.arg2 = parts[2];
+      op.target = parts[4];
+      if (parts[1] == "AND")
+      {
+        op.gate = Gate::AND;
+      }
+      else if (parts[1] == "OR")
+      {
+        op.gate = Gate::OR;
+      }
+      else if (parts[1] == "XOR")
+      {
+        op.gate = Gate::XOR;
+      }
+      else
+      {
+        throw std::runtime_error("invalid gate");
+      }
+      if(data.gates.find(op.arg1) == data.gates.end()) {
+        data.gates[op.arg1] = -1;
+      }
+      if(data.gates.find(op.arg2) == data.gates.end()) {
+        data.gates[op.arg2] = -1;
+      }
+      if(data.gates.find(op.target) == data.gates.end()) {
+        data.gates[op.target] = -1;
+      }
+      data.operations.push_back(op);
+    }
+  }
+
+  return data;
+}
+
+class BenchmarkFixture : public benchmark::Fixture
+{
+public:
+  static Data data;
+};
+
+Data BenchmarkFixture::data = parse();
+
+BENCHMARK_DEFINE_F(BenchmarkFixture, Part1Benchmark)
+(benchmark::State &state)
+{
+  for (auto _ : state)
+  {
+    auto s = part1(data);
+    benchmark::DoNotOptimize(s);
+  }
+}
+
+BENCHMARK_DEFINE_F(BenchmarkFixture, Part2Benchmark)
+(benchmark::State &state)
+{
+  for (auto _ : state)
+  {
+    auto s = part2(data);
+    benchmark::DoNotOptimize(s);
+  }
+}
+
+BENCHMARK_REGISTER_F(BenchmarkFixture, Part1Benchmark)->Unit(benchmark::kMillisecond);
+BENCHMARK_REGISTER_F(BenchmarkFixture, Part2Benchmark)->Unit(benchmark::kMillisecond);
+
+int main(int argc, char **argv)
+{
+  Data data = parse();
+
+  int64_t answer1 = 0;
+  int64_t answer2 = 0;
+
+  auto first = part1(data);
+  std::cout << "Part 1: " << first << std::endl;
+  
+  auto second = part2(data);
+  std::cout << "Part 2: " << second << std::endl;
+
+  first != answer1 ? throw std::runtime_error("Part 1 incorrect") : nullptr;
+  second != answer2 ? throw std::runtime_error("Part 2 incorrect") : nullptr;
+
+  for (int i = 1; i < argc; ++i) {
+    if (std::string(argv[i]) == "--benchmark") {
+      benchmark::Initialize(&argc, argv);
+      benchmark::RunSpecifiedBenchmarks();
+      return 0;
+    }
+  }
+}