Triangular number

约 98 字小于 1 分钟

2026-02-11

题目

Given a number N, find the Nth triangular number, i.e. 1 + 2 + 3 + ... + N

解题思路

待补充

答案

type Triangular<N extends number> = any

验证

import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Triangular<0>, 0>>,
  Expect<Equal<Triangular<1>, 1>>,
  Expect<Equal<Triangular<3>, 6>>,
  Expect<Equal<Triangular<10>, 55>>,
  Expect<Equal<Triangular<20>, 210>>,
  Expect<Equal<Triangular<55>, 1540>>,
  Expect<Equal<Triangular<100>, 5050>>,
]

参考

无