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const mongoose = require('mongoose')
const { MongoMemoryServer } = require('mongodb-memory-server')

const User = require('./user.model')
const Post = require('./post.model')

const start = async () => {
  // connect to a mongo database
  const mongodb = new MongoMemoryServer()
  const connectionUri = await mongodb.getUri()

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const mongoose = require('mongoose')
const schema = require('gridfile')

module.exports = mongoose.model('Attachment', schema, 'attachment.files')

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const express = require('express')
const multer = require('multer')
const path = require('path')
const fs = require('fs')
const mongoose = require('mongoose')
const { MongoMemoryServer } = require('mongodb-memory-server')

const GridFile = require('./gridfile.model')
const upload = multer({ dest: path.join(__dirname, '.') })

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const express = require('express')
const app = express()
const port = 3000

/**
 * Express middleware to log request and response headers
 */
app.use((req, res, nxt) => {
  const requestHeaders = req.headers

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//Reference: http://www.geeksforgeeks.org/graph-and-its-representations/
import java.util.*;

public class Graph {
    List<Integer> vertices[];
    
    public Graph(int count){
        vertices = new ArrayList[count];
        
        for(int i = 0; i < count; i++){