All files / leetCode 0206.ts

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import type { ListNode } from './List'
 
export default function reverseList(
  head: ListNode<number> | null,
): ListNode<number> | null {
  if (head === null || head.next === null)
    return head
 
  let prev: ListNode<number> | null = null
  let current: ListNode<number> | null = head
 
  while (current) {
    const next: ListNode<number> | null = current.next
    current.next = prev
    prev = current
    current = next
  }
 
  return prev
}