Discussion on: AoC Day 2: Inventory Management System

[Dylan Paulus]

Terrible C++ solution for part 1 !

#include <iostream>
#include <fstream>
#include <list>
#include <map>

std::list<std::string> read_file(std::string filename)
{
  auto lines = std::list<std::string>();
  std::ifstream file(filename);

  for (std::string line; std::getline(file, line);)
  {
    lines.push_back(line);
  }

  file.close();

  return lines;
}

class WordCounter
{
public:
  static std::map<char, int> CalculateLine(const std::string line)
  {
    auto map = std::map<char, int>();

    if (line.length() == 0)
    {
      return map;
    }

    for (int i = 0; i < line.length(); i++)
    {
      std::map<char, int>::iterator it = map.find(line[i]);

      if (it != map.end())
      {
        it->second = it->second + 1;
      }
      else
      {
        map.insert(std::pair<char, int>(line[i], 1));
      }
    }

    return map;
  }

  static const std::pair<int, int> Sum(std::map<char, int> map)
  {
    int twos = 0;
    int threes = 0;

    for (auto line = map.begin(); line != map.end(); line++)
    {
      if (line->second == 2)
      {
        twos = 1;
      }
      else if (line->second == 3)
      {
        threes = 1;
      }
    }

    return std::pair<int, int>(twos, threes);
  }
};

int main()
{
  auto input = read_file("./input.txt");
  int two = 0;
  int three = 0;

  for (auto i = input.begin(); i != input.end(); i++)
  {
    auto letterMap = WordCounter::CalculateLine(*i);
    auto calculated = WordCounter::Sum(letterMap);

    two += calculated.first;
    three += calculated.second;
  }

  std::cout << two * three << std::endl;

  return 0;
}

[Ryan Palo]

Terrible is better than never finished! And this looks pretty good to me, not knowing C++ if that makes you feel better 😄