133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
#include "AdventHelpers/AdventOfCodeSolution.h"
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#include <iostream>
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#include <cassert>
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#include <string>
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class Dial {
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public:
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Dial(bool debug = false, int initialPosition = 50, int minPosition = 0, int maxPosition = 99)
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: mDebug(debug)
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, mPosition(initialPosition)
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, mMinPosition(minPosition)
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, mMaxPosition(maxPosition)
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{
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}
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// Returns number of times it passes 0
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int TurnLeft(int amount) {
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int clicksAtZero = 0;
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if (mDebug) std::cout << "Turning left " << amount << " from " << mPosition;
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while (amount > 0) {
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if (mPosition == 0) {
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mPosition = mMaxPosition;
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}
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else {
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mPosition--;
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if (mPosition == 0) clicksAtZero++;
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}
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amount--;
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}
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assert(amount == 0);
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if (mDebug) std::cout << " Ended at: " << mPosition << std::endl;
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return clicksAtZero;
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}
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// Returns number of times it passes 0
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int TurnRight(int amount) {
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int clicksAtZero = 0;
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if (mDebug) std::cout << "Turning right " << amount << " from " << mPosition;
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while (amount > 0) {
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if (mPosition == mMaxPosition) {
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mPosition = 0;
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clicksAtZero++;
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}
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else {
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mPosition++;
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}
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amount--;
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}
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assert(amount == 0);
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if (mDebug) std::cout << " Ended at: " << mPosition << std::endl;
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return clicksAtZero;
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}
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int GetPosition() const {
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return mPosition;
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}
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private:
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const bool mDebug;
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const int mMaxPosition;
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const int mMinPosition;
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int mPosition;
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};
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class Day01Solution : public AdventHelpers::AdventOfCodeSolution
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{
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public:
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virtual std::string SolveProblem01(AdventHelpers::InputFileHelper& inputFile) override {
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Dial dial;
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int password = 0;
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for (const auto& line : inputFile) {
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assert(line.length() >= 2);
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char direction = line[0];
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int amount = std::stoi(line.substr(1));
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if (direction == 'L') {
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dial.TurnLeft(amount);
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}
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else if (direction == 'R') {
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dial.TurnRight(amount);
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}
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else {
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assert(false && "Invalid direction");
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}
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if (dial.GetPosition() == 0) {
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password++;
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}
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}
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return std::to_string(password);
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}
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virtual std::string SolveProblem02(AdventHelpers::InputFileHelper& inputFile) override {
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Dial dial;
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int clicksAtZero = 0;
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for (const auto& line : inputFile) {
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assert(line.length() >= 2);
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char direction = line[0];
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int amount = std::stoi(line.substr(1));
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if (direction == 'L') {
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clicksAtZero += dial.TurnLeft(amount);
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}
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else if (direction == 'R') {
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clicksAtZero += dial.TurnRight(amount);
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}
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else {
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assert(false && "Invalid direction");
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}
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}
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return std::to_string(clicksAtZero);
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}
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};
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int main(const char *argv[], int argc)
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{
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Day01Solution solution;
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solution.SolveAll();
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return 0;
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}
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