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utils.ts
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/
utils.ts
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import { readFileSync } from 'fs'
import { dirname, join } from 'path'
export const sum = (a: number, b: number) => a + b
export const mul = (a: number, b: number) => a * b
export const min = (a: number, b: number) => Math.min(a, b)
export const max = (a: number, b: number) => Math.max(a, b)
export const compareNumber = (a: number, b: number) => a - b
export const compareNumberDescending = (a: number, b: number) =>
a > b ? -1 : 1
export const range = (num: number) => [...Array(num).keys()]
const cwd = dirname(require.main?.filename || '')
const readInputFile = (name: string) =>
readFileSync(join(cwd, name)).toString().replaceAll('\r\n', '\n').trimEnd()
export const getDemoInput = (num: number | undefined = undefined) =>
readInputFile(`demo-input${num === undefined ? '' : num}.txt`)
export const getInput = () => readInputFile('input.txt')
export function primeFactors(n: number) {
const factors: number[] = []
let divisor = 2
while (n >= 2) {
if (n % divisor == 0) {
factors.push(divisor)
n = n / divisor
} else {
divisor++
}
}
return factors
}
export function zip<T extends unknown[][]>(
...args: T
): { [K in keyof T]: T[K] extends (infer V)[] ? V : never }[] {
const minLength = Math.min(...args.map((arr) => arr.length))
// @ts-expect-error This is too much for ts
return range(minLength).map((i) => args.map((arr) => arr[i]))
}
export function notNull<T>(val: T): val is NonNullable<T> {
return val != null
}