All files / leetCode 0144.ts

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import type { TreeNode } from './Tree'
import { traversal } from './Tree'
 
export default function preorderTraversal(
  root: TreeNode<number> | null,
): number[] {
  const res: number[] = []
 
  traversal(
    root,
    (node) => {
      res.push(node)
    },
    'pre',
  )
 
  return res
}