AdventOfCode2021/Day10/Syntax.ts

import { readLines } from "https://deno.land/std@0.177.1/io/read_lines.ts";

async function Part1() {
    const file = await Deno.open("./Day10/input.txt");
    const lines = readLines(file);

    let error = 0;

    for await (const line of lines) {
        const brackets = []
        for (const c of line.split("")) {
            if (c == "(") {
                brackets.push(1);
            }
            if (c == "[") {
                brackets.push(2);
            }
            if (c == "{") {
                brackets.push(3);
            }
            if (c == "<") {
                brackets.push(4);
            }
            if (c == ")") {
                const d = brackets.pop();
                if (d != 1) {
                    error += 3;
                    break
                }
            }
            if (c == "]") {
                const d = brackets.pop();
                if (d != 2) {
                    error += 57;
                    break
                }
            }
            if (c == "}") {
                const d = brackets.pop();
                if (d != 3) {
                    error += 1197;
                    break
                }
            }
            if (c == ">") {
                const d = brackets.pop();
                if (d != 4) {
                    error += 25137;
                    break
                }
            }
        }
    }
    return error
}

async function Part2() {
    const file = await Deno.open("./Day10/input.txt");
    const lines = readLines(file);

    let scores: number[] = []

    for await (const line of lines) {
        let brackets = isCorrupted(line)
        if (brackets[brackets.length - 1] == 5) {
            continue
        }
        let score = 0
        while (brackets.length != 0) {
            score *= 5;
            const b = brackets.pop()!
            score += b;
        }
        scores.push(score)
    }
    scores.sort((a,b) => a -b)
    return scores[(scores.length - 1) / 2]
}

console.log("Part1: " + await Part1());
console.log("Part2: " + await Part2())

function isCorrupted(line:string) {
    const brackets = []
        for (const c of line.split("")) {
            if (c == "(") {
                brackets.push(1);
            }
            if (c == "[") {
                brackets.push(2);
            }
            if (c == "{") {
                brackets.push(3);
            }
            if (c == "<") {
                brackets.push(4);
            }
            if (c == ")") {
                const d = brackets.pop();
                if (d != 1) {
                    brackets.push(5)
                    return brackets
                }
            }
            if (c == "]") {
                const d = brackets.pop();
                if (d != 2) {
                    brackets.push(5)
                    return brackets
                }
            }
            if (c == "}") {
                const d = brackets.pop();
                if (d != 3) {
                    brackets.push(5)
                    return brackets
                }
            }
            if (c == ">") {
                const d = brackets.pop();
                if (d != 4) {
                    brackets.push(5)
                    return brackets
                }
            }
        }
    return brackets
}