Day 3Lobby

View puzzle description on Advent of Code

It's always nice when part two gives you a solution which will also work with part one. In this case we could use getJoltage(2) in part one and getJoltage(12) in part two.

export default (input: string): number => {
  const lines = input.split('\n');
  let total = 0;


  for (const line of lines) {
    let highestValue = 0;


    for (let i = 0; i < line.length - 1; i++) {
      const startChar = line[i];


      for (let j = i + 1; j < line.length; j++) {
        const endChar = line[j];
        const value = Number(`${startChar}${endChar}`);


        if (value > highestValue) {
          highestValue = value;
        }
      }
    }


    total += highestValue;
  }


  return total;
};