aoc24/solutions/03.ts
2024-12-06 03:07:32 +01:00

53 lines
No EOL
1.6 KiB
TypeScript

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
// get all matches and parse them to int[]
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
// get all matches and parse them to int[]
const instructions = this.input.replace('\n', '').trim().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())