aoc-2.cpp

#include <fstream>
#include <iostream>
#include <map>
#include <string>

int main() {
  int twos = 0;
  int threes = 0;

  std::string line;

  std::ifstream inFile;
  inFile.open("aoc-input-2");

  while (inFile >> line) {
    std::map<char, int> counts;

    for(char& c : line) {
      if(counts.count(c) == 0) {
        counts[c] = 1;
      } else {
        ++counts[c];
      }
    }

    bool foundTwos = false;
    bool foundThrees = false;

    auto it = counts.begin();

    while(it != counts.end()) {
      if (!foundTwos && it->second == 2) {
        ++twos;
        foundTwos = true;

        if (foundThrees) break;
      } else if (!foundThrees && it->second == 3) {
        ++threes;
        foundThrees = true;

        if (foundTwos) break;
      }

      ++it;
    }
  }
  inFile.close();

  std::cout << (twos * threes) << std::endl;
}

aoc-2.js

let twos = 0;
let threes = 0;

const data = require('fs').readFileSync('aoc-input-2', 'utf-8').trim()
  .split('\n');

for (const line of data) {
  const counts = {};

  for(const char of line) {
    if (!counts[char]) {
      counts[char] = 1;
    } else {
      ++counts[char];
    }
  }

  let foundTwos = false;
  let foundThrees = false;

  const values = Object.values(counts);

  for(const value of values) {
    if (!foundTwos && value === 2) {
      ++twos;
      foundTwos = true;

      if (foundThrees) break;
    } else if (!foundThrees && value === 3) {
      ++threes;
      foundThrees = true;

      if (foundTwos) break;
    }
  }
}

console.log(twos * threes);

aoc-input-2

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