Day 7: Camel Cards

Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ , pastebin, or github (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

FAQ

  • What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
  • Where do I participate?: https://adventofcode.com/
  • Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465

🔒 Thread is locked until there's at least 100 2 star entries on the global leaderboard

🔓 Thread has been unlocked after around 20 mins

  • Ategon@programming.devM
    ·
    7 months ago

    JavaScript

    Ended up misreading the instructions due to trying to go fast. Built up a system to compare hand values like its poker before I realized its not poker

    Likely last day im going to be able to write code for due to exams coming up

    Code Link

    Code Block 
    // Part 1
// ======

function part1(input) {
  const lines = input.replaceAll("\r", "").split("\n");
  const hands = lines.map((line) => line.split(" "));

  const sortedHands = hands.sort((a, b) => {
    const handA = calculateHandValue(a[0]);
    const handB = calculateHandValue(b[0]);

    if (handA > handB) {
      return -1;
    } else if (handA < handB) {
      return 1;
    } else {
      for (let i = 0; i < 5; i++) {
        const handACard = convertToNumber(a[0].split("")[i]);
        const handBCard = convertToNumber(b[0].split("")[i]);
        if (handACard > handBCard) {
          return 1;
        } else if (handACard < handBCard) {
          return -1;
        }
      }
    }
  });

  return sortedHands
    .filter((hand) => hand[0] != "")
    .reduce((acc, hand, i) => {
      return acc + hand[1] * (i + 1);
    }, 0);
}

function convertToNumber(card) {
  switch (card) {
    case "A":
      return 14;
    case "K":
      return 13;
    case "Q":
      return 12;
    case "J":
      return 11;
    case "T":
      return 10;
    default:
      return parseInt(card);
  }
}

function calculateHandValue(hand) {
  const dict = {};

  hand.split("").forEach((card) => {
    if (dict[card]) {
      dict[card] += 1;
    } else {
      dict[card] = 1;
    }
  });

  // 5
  if (Object.keys(dict).length === 1) {
    return 1;
  }

  // 4
  if (Object.keys(dict).filter((key) => dict[key] === 4).length === 1) {
    return 2;
  }

  // 3 + 2
  if (
    Object.keys(dict).filter((key) => dict[key] === 3).length === 1 &&
    Object.keys(dict).filter((key) => dict[key] === 2).length === 1
  ) {
    return 3;
  }

  // 3
  if (Object.keys(dict).filter((key) => dict[key] === 3).length === 1) {
    return 4;
  }

  // 2 + 2
  if (Object.keys(dict).filter((key) => dict[key] === 2).length === 2) {
    return 5;
  }

  // 2
  if (Object.keys(dict).filter((key) => dict[key] === 2).length === 1) {
    return 6;
  }

  return 7;
}

// Part 2
// ======

function part2(input) {
  const lines = input.replaceAll("\r", "").split("\n");
  const hands = lines.map((line) => line.split(" "));

  const sortedHands = hands.sort((a, b) => {
    const handA = calculateHandValuePart2(a[0]);
    const handB = calculateHandValuePart2(b[0]);

    if (handA > handB) {
      return -1;
    } else if (handA < handB) {
      return 1;
    } else {
      for (let i = 0; i < 5; i++) {
        const handACard = convertToNumberPart2(a[0].split("")[i]);
        const handBCard = convertToNumberPart2(b[0].split("")[i]);
        if (handACard > handBCard) {
          return 1;
        } else if (handACard < handBCard) {
          return -1;
        }
      }
    }
  });

  return sortedHands
    .filter((hand) => hand[0] != "")
    .reduce((acc, hand, i) => {
      console.log(acc, hand, i + 1);
      return acc + hand[1] * (i + 1);
    }, 0);
}

function convertToNumberPart2(card) {
  switch (card) {
    case "A":
      return 14;
    case "K":
      return 13;
    case "Q":
      return 12;
    case "J":
      return 1;
    case "T":
      return 10;
    default:
      return parseInt(card);
  }
}

function calculateHandValuePart2(hand) {
  const dict = {};

  let jokers = 0;

  hand.split("").forEach((card) => {
    if (card === "J") {
      jokers += 1;
      return;
    }
    if (dict[card]) {
      dict[card] += 1;
    } else {
      dict[card] = 1;
    }
  });

  // 5
  if (jokers === 5 || Object.keys(dict).length === 1) {
    return 1;
  }

  // 4
  if (
    jokers === 4 ||
    (jokers === 3 &&
      Object.keys(dict).filter((key) => dict[key] === 1).length >= 1) ||
    (jokers === 2 &&
      Object.keys(dict).filter((key) => dict[key] === 2).length === 1) ||
    (jokers === 1 &&
      Object.keys(dict).filter((key) => dict[key] === 3).length === 1) ||
    Object.keys(dict).filter((key) => dict[key] === 4).length === 1
  ) {
    return 2;
  }

  // 3 + 2
  if (
    (Object.keys(dict).filter((key) => dict[key] === 3).length === 1 &&
      Object.keys(dict).filter((key) => dict[key] === 2).length === 1) ||
    (Object.keys(dict).filter((key) => dict[key] === 2).length === 2 &&
      jokers === 1)
  ) {
    return 3;
  }

  // 3
  if (
    Object.keys(dict).filter((key) => dict[key] === 3).length === 1 ||
    (Object.keys(dict).filter((key) => dict[key] === 2).length === 1 &&
      jokers === 1) ||
    (Object.keys(dict).filter((key) => dict[key] === 1).length >= 1 &&
      jokers === 2) ||
    jokers === 3
  ) {
    return 4;
  }

  // 2 + 2
  if (
    Object.keys(dict).filter((key) => dict[key] === 2).length === 2 ||
    (Object.keys(dict).filter((key) => dict[key] === 2).length === 1 &&
      jokers === 1)
  ) {
    return 5;
  }

  // 2
  if (
    Object.keys(dict).filter((key) => dict[key] === 2).length === 1 ||
    jokers
  ) {
    return 6;
  }

  return 7;
}

export default { part1, part2 };