aoc24/solutions/03.ts

import { solvables } from "../main.ts";

import type { Solvable } from "../solvable.ts";
import { readInput } from "../utils.ts";

class DayThree implements Solvable {
    input = readInput('03')

    private multiplyInstruction(inst: string) {
        return inst
            .slice(4, -1)
            .split(',')
            .map(arr => Number.parseInt(arr))
    }

    public part1(): Solvable {
        const re = /mul\([0-9]{1,3},[0-9]{1,3}\)/g
        const result = this.input.matchAll(new RegExp(re))
            .map(match => this.multiplyInstruction(match[0]))
            .map(([left, right]) => left * right)
            .reduce((prev, curr) => prev + curr)
            console.log(result)
            return this
    }

    public part2(): Solvable {
        const re = /(mul\([0-9]{1,3},[0-9]{1,3}\)|do\(\)|don\'t\(\))/g
        const instructions = this.input.matchAll(new RegExp(re)).map(match => match[0])
        let active = true
        let result = 0
        for (const inst of instructions) {
            if (inst === 'do()') {
                active = true
                continue
            }
            if (inst === 'don\'t()') {
                active = false
                continue
            }
            if (active) {
                const [left, right] = this.multiplyInstruction(inst)
                result += left * right
            }
        }
        console.log(result)
        return this
    }
}

solvables.push(new DayThree())