72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
#include <fstream>
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#include <iostream>
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#include <vector>
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struct Instruction {
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const char direction;
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const int value;
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};
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std::vector<Instruction> parse_input_file(const std::string &path) {
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std::ifstream file;
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std::vector<Instruction> vec;
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std::string line;
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file.open(path);
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if (file.is_open()) {
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while (std::getline(file, line)) {
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auto instr = line.at(0);
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int value = std::stoi(line.substr(1));
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vec.emplace_back(Instruction{instr, value});
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}
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file.close();
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} else {
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std::cout << "Failed to open file: " << path << std::endl;
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}
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return vec;
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}
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std::tuple<int, int> doit(const std::vector<Instruction> &instructions) {
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int dial_val = 50;
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int zero_counter_part1 = 0;
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int zero_counter_part2 = 0;
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for (const auto &instr : instructions) {
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for (int i = 0; i < instr.value; i++) {
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if (instr.direction == 'L') {
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dial_val--;
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} else {
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dial_val++;
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}
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if (dial_val > 99)
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dial_val = 0;
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else if (dial_val < 0)
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dial_val = 99;
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if (dial_val == 0)
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zero_counter_part2 += 1;
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}
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if (dial_val == 0)
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zero_counter_part1 += 1;
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std::cout << "dial_val: " << dial_val << std::endl;
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}
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return std::make_tuple(zero_counter_part1, zero_counter_part2);
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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::cout << "One argument required: input txt" << std::endl;
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}
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auto instructions = parse_input_file(argv[1]);
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auto num_zeros = doit(instructions);
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std::cout << "Number of times dial hits zero (part 1): "
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<< std::get<0>(num_zeros) << std::endl;
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std::cout << "Number of times dial hits zero (part 2): "
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<< std::get<1>(num_zeros) << std::endl;
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return 0;
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}
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