2649. Nested Array Generator

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2649. Nested Array Generator

題目描述

Given a multi-dimensional array of integers, return a generator object which yields integers in the same order as inorder traversal.

A multi-dimensional array is a recursive data structure that contains both integers and other multi-dimensional arrays.

inorder traversal iterates over each array from left to right, yielding any integers it encounters or applying inorder traversal to any arrays it encounters.

範例

Example 1:

Input: arr = [[[6]],[1,3],[]]
Output: [6,1,3]
Explanation:
const generator = inorderTraversal(arr);
generator.next().value; // 6
generator.next().value; // 1
generator.next().value; // 3
generator.next().done; // true

Example 2:

Input: arr = []
Output: []
Explanation: There are no integers so the generator doesn't yield anything.

Constraints:

• 0 <= arr.flat().length <= 10⁵
• 0 <= arr.flat()[i] <= 10⁵
• maxNestingDepth <= 10⁵

解答

TypeScript

type MultidimensionalArray = (MultidimensionalArray | number)[];

function* inorderTraversal(arr: MultidimensionalArray): Generator<number, void, unknown> {
  for (let i = 0; i < arr.length; i++) {
    if (typeof arr[i] === 'number') {
      yield arr[i] as number;
    } else {
      yield* inorderTraversal(arr[i] as MultidimensionalArray);
    }
  }
}

SheepSat, June 3, 2023

Reference

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