64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#include "Day2Solution.h"
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#include <fstream>
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#include <iostream>
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void Day2Solution::run()
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{
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std::string line;
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std::ifstream input_file("../input/day2.txt");
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std::vector<int> program;
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if (input_file.is_open()) {
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while (getline(input_file, line, ',')) {
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program.push_back(std::stoi(line));
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}
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auto result1 = run_program(program, 12, 2);
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std::cout << "Part 1 Answer: " << result1 << std::endl;
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auto result2 = search_program(program, 19690720);
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std::cout << "Part 2 Answer: " << result2 << std::endl;
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input_file.close();
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}
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}
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int Day2Solution::run_program(std::vector<int> program, int noun, int verb)
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{
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auto program_counter = 0;
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auto running = true;
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program[1] = noun;
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program[2] = verb;
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while (running) {
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auto opcode = program[program_counter++];
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auto val1 = program[program[program_counter++]];
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auto val2 = program[program[program_counter++]];
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switch (opcode) {
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case 1: // addition
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program[program[program_counter++]] = val1 + val2;
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break;
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case 2: // multiplication
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program[program[program_counter++]] = val1 * val2;
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break;
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case 99: // halt
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default: // unhandled
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running = false;
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break;
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}
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}
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return program[0];
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}
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int Day2Solution::search_program(std::vector<int> program, int expected_value)
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{
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for (auto noun = 0; noun < 99; noun++) {
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for (auto verb = 0; verb < 99; verb++) {
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auto value = run_program(program, noun, verb);
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if (value == expected_value) {
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return 100 * noun + verb;
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}
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}
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}
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return -1;
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} |