You just have to satisfy two conditions to crack this problem, but how will you implement this?
Find the minimum number of operations to obtain an array of lists that satisfies a few conditions in the said question. All you have to do is to make sure that the first element and last element of each list are equal and the first element of all the lists is the same. Print -1 if it is impossible to achieve this via any sequence of operations. Participate in the last Long Challenge of the year here: http://bit.ly/3lz0AFK

The year is almost about to end, but we have more interesting challenges and contests for you! But now let's take a look at the Indian coders who rose to the top for the first time and stole the show with their performance. Check out the blog to know if you know somebody mentioned in there! https://bit.ly/3Ini8yi

Did you play the Google Doodle mini Pizza game today? In 2007, UNESCO recognized "Pizzaiuolo" for the Intangible Culinary Heritage of Humanity, and Google celebrated this day with this mini Pizza game. Do you know who else loves a good pizza? Our Chef! Check out this problem and help the chef figure out how to make the tastiest pizza. https://bit.ly/3GzutOj

Find the shortest binary string with exactly N hills and M valleys.
A hill is any index such that both its neighbors are strictly smaller than it and a valley is any index such that both its neighbors are strictly larger than it.
If there are multiple possible binary strings of the least length satisfying the given condition, you may print any of them. Participate in the Dec Long Challenge: https://bit.ly/3IlP4am

Do you know any talented coders from school? Then you should share this with them! The registration for the Zonal level Olympiad, the gateway to one of the world's biggest and most prestigious Olympiads, is still open! Less than 48 hours to register, so head over and grab the seat asap. https://bit.ly/3DuMqeA

We are back again with another Beginner's Bootcamp for y'all! This camp is curated specially for the absolute beginners in coding to improve their skills and also become a rated CodeChef coder. By the end of this two-day camp, you would have solved 30 problems with your mentor, Chitrank Mishra, and be all ready to try your hand at the upcoming rated contests. So, see you all there? The seats are limited, so register right away! https://bit.ly/3IqhwrJ

With roughly 2.89 billion users, Facebook is the most extensive social network! But do you know how Facebook manages to keep you connected using various algorithms? Check out the blog to learn how. https://bit.ly/307ZIjE

Have the dinner a bit early, grab a mug of coffee, and be all pumped up for the Starters tonight! Rated for both Division 2 and 3 coders, this is your chance to rank up and challenge coders across the world. https://bit.ly/3yeEP2Q

We have got some new career opportunities for you! Right from a fresher to experienced SDE role at Junglee Games to a Senior Technical Analyst at Ribbon Communications, and even an internship opportunity at Zaamo's. Well, why are you still waiting? Head over right now, and apply right away. https://bit.ly/3oHPi3U

The first Starters of this month wrapped a few hours ago, but we are back again with the next one for you! Starters 20, rated only for Division 3, is this Wednesday, from 8 PM, so better ramp up your preparation and pass the word to your programming gang. https://bit.ly/30gvISL

Remember a few days ago, we asked you what timing you would want all your short challenges to begin? Well, guess what! From now on all CodeChef Monthly Rated short Contests will be held at one specific time! Yep, quite a relief for some, right? Head over to the blog to know more about this change. https://bit.ly/3dGGKEb

P Equal To NP was one of the most challenging problems for both Division 2 and 3 coders, with less than 200 successful submissions. But now that the Video Editorials are out, go watch the solution for that, and learn how to solve that! Share the video with your coder friends, and end your weekend by learning something new. https://bit.ly/3dLcXu0

#CodeChef #starters

⏹ Competitive Programming Practice & Learn Section:
🔸 Beginner & Easy Level | Coding Practice Problem Video Editorials Playlist : https://bit.ly/3n55DPg
🔸 Medium & Hard Level | Coding Practice Problem Video Editorials Playlist : https://bit.ly/3omyGgB

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🔸 Weekend Special Session By CodeChef : https://bit.ly/3ombHCk
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🔸 CTO and Co-founder's Conversations With CodeChef Series : https://bit.ly/3gHBAtl
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🔸 CodeChef LockOut | 1v1 Coding Contests LIVE streamed Playlist : https://bit.ly/3n4ZOl8

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There are 60 coders in SnackDown Grand Finale, don't you want to know a bit more about them? Well we've got a blog series all ready and the first of the three parts of the series is out now! Go get to know your SnackDown finalists! https://bit.ly/3dNERFK

Guys, Join CodeChef's official Telegram group https://t.me/+85PkO5auFWQ4M2I1 where you can discuss the CP problems.

The playground is all set, and the Chef is handpicking the questions right now. Division 3 coders, do not miss this golden chance to rank up, and other divisions can use this as an opportunity to practice and test your new skills. https://bit.ly/3IKEdH7

The first Starters of December, a.k.a Starters 19, has officially concluded, and there's plenty to reminisce about. Check out the blog to catch a quick recap of the contest and see who claimed the top positions. https://bit.ly/33mMgJX

Are you new to CodeChef, and confused about how to become a rated coder? Well, we have got you covered! A quick 3-hour camp curated specially for the absolute beginners to get you started with, improve your skills, and also become a rated CodeChef coder. The seats are filling up, so hurry up and register fast! https://bit.ly/3oZ0cSU

The last Long Challenge of the year wrapped a few days ago, and we saw a lot of Division 3 coders break barriers this time to rise to the top. A young coder from Amity International School, a working professional from Wipro Technologies, and a few other coders from various colleges across the country are the ones who made us proud this time. Check out the blog to know more about who all cracked the code. https://bit.ly/320LRN6

👉You can checkout the complete Playlist of ''CodeChef Intermediate BootCamp''.Click here to watch it : https://bit.ly/3F2xt5i