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View More/*Good morning! Here's your coding interview problem for today.This problem was asked by Stripe.Given an array of integers, find the first missing positive integer in linear time and constant space. In other words, find the lowest positive integer that does not exist in the array. The array can contain duplicates and negative numbers as well.For example, the input [3, 4, -1, 1] should give 2. The input [1, 2, 0] should give 3.You can modify the input array in-place.*/#include <iostream>using namespace std;int calcMissing(int* input, int size){int sum = 0;int n = 1; //add one to account for missing valuefor(int i = 0; i < size; i++){if(input[i] > 0){sum += input[i];n++;}}//If no numbers higher than 0, answer is 1if(sum == 0)return 1;return (n*(n+1)/2) - sum; //Formula is expectedSum - actualSum/* expectedSum = n*(n+1)/2, the formula for sum(1, n) */}int main(){cout << calcMissing(new int[4]{3, 4, -1, 1}, 4) << endl;cout << calcMissing(new int[3]{1, 2, 0}, 3) << endl;//No positive numberscout << calcMissing(new int[1]{0}, 1) << endl;}
var invertTree = function(root) {const reverseNode = node => {if (node == null) {return null}reverseNode(node.left);reverseNode(node.right);let holdLeft = node.left;node.left = node.right;node.right = holdLeft;return node;}return reverseNode(root);};
const MongoClient = require('mongodb').MongoClient;const assert = require('assert');// Connection URLconst url = 'mongodb://localhost:27017';// Database Nameconst dbName = 'myproject';// Use connect method to connect to the serverMongoClient.connect(url, function(err, client) {assert.equal(null, err);console.log("Connected successfully to server");const db = client.db(dbName);client.close();});
my_list = ["blue", "red", "green"]#1- Using sort or srted directly or with specifc keysmy_list.sort() #sorts alphabetically or in an ascending order for numeric datamy_list = sorted(my_list, key=len) #sorts the list based on the length of the strings from shortest to longest.# You can use reverse=True to flip the order#2- Using locale and functoolsimport localefrom functools import cmp_to_keymy_list = sorted(my_list, key=cmp_to_key(locale.strcoll))
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View More# Python program for implementation of Bubble Sortdef bubbleSort(arr):n = len(arr)# Traverse through all array elementsfor i in range(n-1):# range(n) also work but outer loop will repeat one time more than needed.# Last i elements are already in placefor j in range(0, n-i-1):# traverse the array from 0 to n-i-1# Swap if the element found is greater# than the next elementif arr[j] > arr[j+1] :arr[j], arr[j+1] = arr[j+1], arr[j]# Driver code to test abovearr = [64, 34, 25, 12, 22, 11, 90]bubbleSort(arr)print ("Sorted array is:")for i in range(len(arr)):print ("%d" %arr[i]),
const getFollowers = async (req: Request, res: Response) => {try {const username = req.params.username || '';const user = await User.findUnique({where: { username },include: { followedBy: true },});if (!user) {res.status(404).json({error: 'User could not be found',});return;}const followers = user.followedBy.map(followedBy => {return {followerId: followedBy.followerId,};});const followersCount = followers.length;res.json({ followersCount: followersCount, followers });} catch (error) {console.error('getFollowers() error: ', error);res.status(500).json({error: `There was an error fetching followers for user with username "${req.params.username}", please try again later`,});}};const getFollowing = async (req: Request, res: Response) => {try {const username = req.params.username || '';const user = await User.findUnique({where: { username },include: { following: true },});if (!user) {res.status(404).json({error: 'User could not be found',});return;}const following = user.following.map(following => {return {followingId: following.followingId,};});const followingCount = following.length;res.json({ followingCount: followingCount, following });} catch (error) {console.error('getFollowing() error: ', error);res.status(500).json({error: `There was an error fetching who is following "${req.params.username}", please try again later`,});}};const followUser = async (req: Request, res: Response) => {try {const username = req.params.username || '';const user = await User.findUnique({where: { username },});if (!user) {res.status(404).json({error: 'User could not be found',});return;}// dont allow a user to follow themselvesif (req.user.id === user.id) {res.status(400).json({ error: 'You cannot follow yourself' });return;}//check if a follow relationship already existsconst followrelationship = await prisma.follows.findUnique({where: {followerId_followingId: {followerId: req.user.id,followingId: user.id,},},});// check if the follow relationship already existsif (followrelationship) {res.status(400).json({ error: 'You are already following this user' });return;}// create the follow relationshipconst follow = await prisma.follows.create({data: {followerId: req.user.id,followingId: user.id,},});res.json({ follow });} catch (error) {console.error('followUser() error: ', error);res.status(500).json({error: `There was an error following "${req.params.username}", please try again later`,});}};const unfollowUser = async (req: Request, res: Response) => {try {const username = req.params.username || '';const user = await User.findUnique({where: { username },});if (!user) {res.status(404).json({error: 'User could not be found',});return;}// dont allow a user to unfollow themselvesif (req.user.id === user.id) {res.status(400).json({ error: 'You cannot unfollow yourself' });return;}//check if a follow relationship already existsconst followrelationship = await prisma.follows.findUnique({where: {followerId_followingId: {followerId: req.user.id,followingId: user.id,},},});// check if the follow relationship already existsif (!followrelationship) {res.status(400).json({ error: 'You are not following this user' });return;}// delete the follow relationshipconst follow = await prisma.follows.delete({where: {followerId_followingId: {followerId: req.user.id,followingId: user.id,},},});res.json({ follow });} catch (error) {console.error('unfollowUser() error: ', error);res.status(500).json({error: `There was an error unfollowing "${req.params.username}", please try again later`,});}};
const mongoose = require('mongoose')const UserSchema = new mongoose.Schema({username: {type: String,required: true},email: {type: String,unique: true,required: true},password: {type: String,required: true},date: {type: Date,default: Date.now}})module.exports = User = mongoose.model('user', UserSchema)
$base-color: #036;@for $i from 1 through 3 {ul:nth-child(3n + #{$i}) {background-color: lighten($base-color, $i * 5%);}}