1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
import { TreeNode } from "../binary-tree-inorder-traversal/TreeNode.ts";
export default function isCompleteTree(root: TreeNode | null): boolean {    if (!root) return false;    const queue: Array<TreeNode | null> = [];    queue.push(root);    let isFindNull = false;    while (queue.length) {        const node = queue.shift();
        if (!node) {            isFindNull = true;        } else {            if (isFindNull) return false;            queue.push(node.left);            queue.push(node.right);        }    }    return true;}