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Pseudo-Palindromic Paths in a Binary Tree:

Given a binary tree where node values are digits from 1 to 9. 
A path in the binary tree is said to be pseudo-palindromic if 
at least one permutation of the node values in the path is a palindrome.
Return the number of pseudo-palindromic paths going from the root node to leaf nodes.

Examples 1:
                  3
               /    \

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.previewIframe { width: 100vw; height: 100vh; border: 0;}

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import { connect, ObjectId } from "../../../utils/database";
// import { connect, ObjectId } from "../../../utils/fakeDatabase";

export default async (req, res) => {
  const {
    query: { id },
    method,
  } = req;
  const collectionName = "pens";
  switch (method) {

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case "POST":
  try {
    const { html, css, js, id } = req.body;
    const { db } = await connect();

    await db
      .collection(collectionName)
      .updateOne(
        { _id: ObjectId(id) },
        { $set: { html: html, css: css, js: js } }

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case "PUT":
  try {
    const { html, css, js } = req.body;
    const { db } = await connect();

    const result = await db.collection(collectionName).insertOne({
      html,
      css,
      js,
    });

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case "GET":
  try {
    const { db } = await connect();
    const data = await db
      .collection(collectionName)
      .findOne({ _id: ObjectId(id) });
    if (!data) {
      res.status(404).json({ success: false });
    }
    res.status(200).json({ data });

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import { connect, ObjectId } from "../../../utils/database";
# OR fake db
import { connect, ObjectId } from "../../../utils/fakeDatabase";

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import { MongoClient, ObjectId } from "mongo-mock";

async function connect() {
  const db = await MongoClient.connect("mongodb://someserver/mock_database");
  const collection = await db.createCollection("pens");

  return {db , collection};
}

export { connect, ObjectId };

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import { MongoClient, ObjectId } from "mongodb";

const dbName = "db-name";
const url = `mongodb+srv://your-username:your-password@cluster0.ldrfm.mongodb.net/your-db?retryWrites=true&w=majority`;

const client = new MongoClient(url, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

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.previewIframe {
  width: 100vw;
  height: 100vh;
  border: 0;
  pointer-events: none;
}

.loading {
  width: 100vw;
  height: 100vh;