43 lines
No EOL
1.6 KiB
TypeScript
43 lines
No EOL
1.6 KiB
TypeScript
import { solvables } from "../main.ts";
|
|
|
|
import type { Solvable } from "../solvable.ts";
|
|
import { readInput } from "../utils.ts";
|
|
|
|
class DayTwo implements Solvable {
|
|
input = readInput('02')
|
|
|
|
public part1(): DayTwo {
|
|
const reports = this.input.trim().split("\n").map(line => line.split(' ').map(level => Number.parseInt(level)))
|
|
const slidingWindow = (levels: number[]): boolean => {
|
|
const gradients: ("ascending" | "descending")[] = []
|
|
let [i,j] = [0,1]
|
|
while (j < levels.length) {
|
|
// is unsafe if ascent / descend bigger than 3 or smaller than 1
|
|
const diff = Math.abs(levels[i] - levels[j])
|
|
if (diff > 3 || diff < 1) {
|
|
return false
|
|
}
|
|
// calculate positive or negative gradient
|
|
if (levels[i] < levels[j]) {
|
|
gradients.push("ascending")
|
|
} else if (levels[i] > levels[j]) {
|
|
gradients.push("descending")
|
|
}
|
|
i++
|
|
j++
|
|
}
|
|
// is safe and constant gradient?
|
|
const constantGradient = gradients.every((gradient) => gradient === "ascending") || gradients.every((gradient) => gradient === "descending")
|
|
return constantGradient
|
|
}
|
|
const result = reports.map(levels => slidingWindow(levels)).filter(level_safe => level_safe === true).length
|
|
console.log(result)
|
|
|
|
return this
|
|
}
|
|
public part2(): DayTwo {
|
|
return this
|
|
}
|
|
}
|
|
|
|
solvables.push(new DayTwo()) |