AdventOfCode2024/05/index.ts

import fs from "node:fs";
import { printTime, now } from "../util";

const test = false;

const data = fs.readFileSync(
  test ? "./inputs/testinput" : "./inputs/input",
  "utf8"
);

let timer = now.instant();
console.log(
  "part one:",
  (() => {
    const { ordering, manuals } = data
      .split("\n")
      .slice(0, -1)
      .reduce(
        (coll, curr) => {
          if (curr === "") {
            return coll;
          }
          if (curr[2] === "|") {
            return { ...coll, ordering: [...coll.ordering, curr.split("|")] };
          }
          if (curr[2] === ",") {
            return { ...coll, manuals: [...coll.manuals, curr.split(",")] };
          }
          return coll;
        },
        { ordering: [], manuals: [] } as {
          ordering: Array<Array<string>>;
          manuals: Array<Array<string>>;
        }
      );

    return manuals.reduce((coll, curr) => {
      const sorted = [...curr].sort((a, b) => {
        return ordering.filter((v) => v[0] === a && v[1] === b).length === 0
          ? 1
          : -1;
      });
      if (sorted.join(",") === curr.join(",")) {
        return coll + parseInt(curr[Math.floor(curr.length / 2)], 10);
      }
      return coll;
    }, 0);
  })(),
  printTime(now.instant().since(timer))
);

timer = now.instant();
console.log(
  "part two:",
  (() => {
    const { ordering, manuals } = data
      .split("\n")
      .slice(0, -1)
      .reduce(
        (coll, curr) => {
          if (curr === "") {
            return coll;
          }
          if (curr[2] === "|") {
            return { ...coll, ordering: [...coll.ordering, curr.split("|")] };
          }
          if (curr[2] === ",") {
            return { ...coll, manuals: [...coll.manuals, curr.split(",")] };
          }
          return coll;
        },
        { ordering: [], manuals: [] } as {
          ordering: Array<Array<string>>;
          manuals: Array<Array<string>>;
        }
      );

    return manuals.reduce((coll, curr) => {
      const sorted = [...curr].sort((a, b) => {
        return ordering.filter((v) => v[0] === a && v[1] === b).length === 0
          ? 1
          : -1;
      });
      if (sorted.join(",") !== curr.join(",")) {
        return coll + parseInt(sorted[Math.floor(curr.length / 2)], 10);
      }
      return coll;
    }, 0);
  })(),
  printTime(now.instant().since(timer))
);