CodeCraft-21 and Codeforces Round #711 (Div. 2) Hello all! We are proud to invite you to **CodeCraft-21**, which takes place on [contest_time:1498]. It is rated for all Div2 participants (rating under 2100). This contest comes under **Threads'21**, as a part of our annual techno-cultural fest [Felicity, IIIT Hyderabad](https://felicity.iiit.ac.in). We have **special prizes for Indian participants**! <img src="/predownloaded/8e/0a/8e0a76faf6acc96ba6ffb9b873136259066b5211.png" width="450px"> You will be given **six problems** to solve in a duration of **two hours**. We have tried our best to keep clean statements, useful samples with good explanations, and strong pretests! We have written step-wise editorials, and will also release video editorials! We would like to thank these amazing people for helping make the contest happen: - [user:bleddest,2021-03-27] for great coordination of our round - [user:ninja_28,2021-03-27], [user:dixitgarg,2021-03-27], [user:ltc.groverkss,2021-03-27] and myself for amazing problem...

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CodeCraft-20 (Div. 2) Hello Codeforces! We are thrilled to invite you to [contest:1316], which is to take place on [contest_time:1316]. The contest is rated for all participants with ratings under 2100. The contest comes under the wing of **Threads '20**, the annual technical fest, a part of [Felicity, IIIT Hyderabad](https://felicity.iiit.ac.in/) .  Participants will be asked to solve **6** problems in **2 hours** . Scoring will be announced just before the contest . The problems were created by [user:gaurav172,2020-03-02], [user:naruhodou,2020-03-02], [user:preet_t,2020-03-02] and [user:shaanknight,2020-03-02] . We want to thank all the people for making this contest possible . - Our Coordinator [user:antontrygubO_o,2020-03-02] for the immense help and guidance. - All the testers of the round : [user:codelegend,2020-03-02], [user:aryanc403,2020-03-02], [user:_overrated_,2020-03-02], [user:FlowerOfSorrow,2020-03-02], [user:nvmdava,2020-03-02], [u...

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Codeforces Round #940 and CodeCraft-23 (Div. 2) ## Hello Codeforces! We're glad to invite everyone to participate in [contest:1957], which will start on [contest_time:1957]. The contest will be rated for all the Div. 2 participants (Rating < 2100). The [Programming Club at IIIT-H](https://iiit-programming-club.github.io/) organizes this event as a part of our techno-cultural fest Felicity @ IIIT Hyderabad.  You will have 6 problems to solve in the duration of <s>2 hours</s> 2 hours and 15 minutes. One of the problems is divided into 2 subtasks. Do ensure you read all of the problems! There have been a bunch of people that have helped us in making this contest a (hopefully) great one! - [user:ScarletS,2023-12-01] and [user:KAN,2024-04-18] for their wonderful coordination. - [user:Alexdat2000,2022-07-17] for translating the problem statements to Russian. - [user:akcube,2024-04-18], [user:fangahawk,2024-04-18], [user:Geng...

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CodeCraft-22 and Codeforces Round #795 (Div 2.) **Namaste Codeforces!** We are excited to invite everyone to **CodeCraft-22** which will take place on [contest_time:1691]. It is rated for all people who are below **<font color="#ff8c00">yellow</font>**! (rating under 2100) The [**Programming Club at IIIT-H**](https://iiit-programming-club.github.io/) organizes this event under Threads'22, as a part of our techno-cultural fest [**Felicity, IIIT Hyderabad**](http://felicity.iiit.ac.in). <img src="/predownloaded/91/7b/917ba5fc64144c1effe15bd932cfb39dab2f7fda.png" width="400px"> There are **6** Problems with **2 hours** to solve them. The scoring distribution will be released soon! We have worked hard to keep the statements clean and the pretests strong! After the contest, **step-wise tutorial** and **video tutorial** will be released along with the code! - This round was wonderfully co-ordinated by [user:darkkcyan,2022-05-27] and [user:KAN,2022-05-27] orz! - This round was a joint effort by [user:rahulgoel,2022-05-...

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Invitation to DeCode 2022 from Felicity Threads IIIT-H Ever thought that all the countless hours you spent debugging your friend's programs were in vain? Don't worry, we have a contest for you, where you can use all the debugging experience that you gained! This contest turns the usual format on its head. You'll be given problems and their buggy code submissions. Your job will be to determine a test case where the buggy solution fails. We are proud to invite you to **DeCode 2022**, as a part of Threads, Felicity **IIIT Hyderabad**! We have **prizes for the top three Global, Indian and IIITH participants**. **Date and Time:** [March 12th, 2100-2300 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Decode+2022+&iso=20220312T21&p1=176&ah=2) **Contest Link**: [CodeChef DECO2022](https://www.codechef.com/DECO2022) **Registration for prizes**: Fill the google [form](https://forms.gle/sTAEmFhWphDTT5PJ6) <img style="float: center;text-aligh: center;width: 500px;height: 500px" src="/predownloaded/50/08/5008b89c38c1...

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CodeCraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) Announcement Hello Everyone! I would like to invite you to CodeCraft-17, which will take place on [Thursday 12th January 2017, 9:05PM IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeCraft-17&iso=20170112T1535&p1=1440&ah=3). The round will be a Div1 + Div2 combined round and is **rated**. [Felicity, IIIT Hyderabad](https://www.facebook.com/felicity.iiith) presents [Threads ‘17](https://felicity.iiit.ac.in/threads/), the magnificent annual technical fest, is finally here in its 13th edition! With a plethora of intellectually engaging online contests in various fields of programming, mathematics and general knowledge, Threads is a celebration of the spirit of computing and engineering. The grand algorithmic sprint called **CodeCraft**, parallel programming in **Kernel Cruise**, mathematical enigmas in **Gordian Knot**, jeopardy style CTF event called **Break In**, overall Threads '17 has something to offer for every kind of computing enthusiast! ![Codecraft Poster ](...

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CodeCraft-18 and Codeforces Round #458 (Div. 1 + Div. 2, combined) Hello Codeforces! I would like to invite you to CodeCraft-18, which will take place on [Saturday, 20th January, 9:05 PM IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeCraft+%2718&iso=20180120T2105&p1=505). This is a combined Div. 1 + Div. 2 round and is **rated** for participants of both divisions. CodeCraft-18 is part of [Felicity, IIIT Hyderabad](https://www.facebook.com/felicity.iiith)'s most awaited set of events, [Threads](https://felicity.iiit.ac.in/threads/). With a plethora of intellectually engaging online contests in various fields of programming, mathematics and general knowledge, Threads is a celebration of the spirit of computing and engineering. Other than CodeCraft, we have the Project Euler-style contest Gordian Knot and a jeopardy-style CTF event called Break In, amongst other events.  I would like to thank the CodeCraft team -- [user:FundamentalEq,2018-01-19], [user:...

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Invitation to Fool's Programming 2022 from Felicity Threads IIIT-H Are you delighted to give programming contests but are yearning for a break from the monotonous contests? Are your friends tired of your puns and references? Can you think out of the box? If so, we invite you to the **Fool's Programming Contest**, as a part of **Threads, Felicity IIIT Hyderabad**! We have **prizes worth 13K INR**. The hardest part of the problem is not programming the solution but deciphering the question, spot the hints and make some guesses to get the same perspective as the problem setters had. **Date and Time:** [March 25th, 2100-2300 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Fools+Programming+2022&iso=20220325T21&p1=176&ah=2) **Contest Link**: [CodeChef FOOL2022](https://www.codechef.com/FOOL2022) **Registration for prizes**: On the contest [page](https://www.codechef.com/FOOL2022) <img style="float: center;text-aligh: center;width: 500px;height: 500px" src="/predownloaded/a2/74/a274a2d27dc6061792a7c0acf328c5cfc7bc2dec.png"> ...

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CodeCraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) Editorial [757A &mdash; Gotta Catch Em' All!](http://www.codeforces.com/contest/757/problem/A) ------------------ **Author:** [user:tanujkhattar,2017-01-13] **Testers:** [user:r.arora,2017-01-13] [user:born2rule,2017-01-13] **Expected complexity**: $\mathcal{O}(n)$ **Main idea**: Maintain counts of required characters. Since we are allowed to permute the string in any order to find the maximum occurences of the string "Bulbasaur", we simply keep the count of the letters 'B', 'u', 'l', 'b', 'a', 's', 'r'. Now the string "Bulbasaur" contains 1 'B', 2'u', 1 'l', 2'a', 1 's', 1'r' and 1 'b', thus the answer to the problem is Min(count('B'), count('b'), count('s'), count('r'), count('l'), count('a')/2, count('u')/2). You can maintain the counts using an array. **Corner Cases:** 1. Neglecting 'B' and while calculating the answer considering count('b')/2. 2. Considering a letter more than once ( 'a' and 'u' ). <spoiler summ...

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Invitation to DeCode 2021 from Felicity Threads IIIT-H Tired of writing AC solutions? We've got you covered! This contest turns the usual format on its head. You'll be given problems and their buggy code submissions. Your job will be to figure out a test case where the buggy solution fails. We are proud to invite you to **DeCode 2021**, as a part of Threads, Felicity **IIIT Hyderabad!** We have **prizes for top three GLOBAL** as well as **top three INDIAN** participants. **Date and Time:** [March 1st, 2100-2300 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=DeCode+2021&iso=20210301T21&p1=176&ah=2&am=00) **Contest Link:** [CodeChef DGTC2021](https://www.codechef.com/DGTC2021) **Registration for prizes:** [Feliciy website](https://felicity.iiit.ac.in/event/decode) (during registration, enter team name as your codechef username) <img src="/predownloaded/33/86/33864b68782cb04914c77c94e97002d2728dede7.png" width="500px"> You will have **eight problems and two hours** to solve them. The problems are a **good mi...

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Invitation to DeCode 2020, Felicity Threads IIIT-H Tired of ACing problems? Bored of seeing green Accepted all over your submissions page? Want something more adventurous? What if we gave you the complete solution, and challenged you to _then_ get an AC? Confused? We are proud to invite you to **DeCode 2020**, as a part of Threads, Felicity **IIIT Hyderabad!** The contest will be held on [contest_time:268401]. We will have **prizes for top three Indian participants**. You'll be given problems and their buggy solutions. Your job will be to figure out on what test cases the buggy solution fails, and also fix the buggy solution itself. The solutions are exclusively written in C++.  You will have **eight problems and two hours** to solve them. The problems are a **good mix** for participants from **international masters** to **pupil**, but of course, we welcome everyone to participate! **[Registration link](https://codeforces.me/group/VbOj3EECYn)**. Ple...

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Introduction to Competitive Machine Learning I realized a lot of people keep pursuing and learning Competitive Programming because they get addicted to Rankings & Ratings. In this blog i have tried to help you exploit your same existing mechanism and learn Machine Learning in the process while pursuing it a competitive way. _I have drawn examples from around 10 kaggle Competitions_ and illustrated what works and what doesn't , what is important and what is not and how much time usually it takes for each step while competing. I have also heavily linked through the blog post and it contains more than enough links for you to start competing on Kaggle or Analytics Vidhya seriously. [Link to original Blog Post on "Introduction to Competitive Machine Learning"](https://threads-iiith.quora.com/Introduction-to-Competitive-Machine-Learning) Also last event by Threads, Felicity'18 called ["Kings of Machine Learning"](http://simplernow.com/redirects/koml.php) is still live. There is Rs 15,000 cash prizes and 20 T-shirts up for th...

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CodeCraft-19 and Codeforces Round #537 (Div. 2) Hello Everyone! I would like to invite you to CodeCraft-19, which is a part of [Felicity](https://www.facebook.com/felicity.iiith), the annual techno-cultural fest of IIIT Hyderabad. It will take place on [contest_time:1111]. The round will be **rated for Div 2 participants (whose ratings are lower than 2100)**. As usual, participants from the first division can participate in the contest out of the competition. You will be given **5** problems, all of which are based on the theme of our fest, "Superheroes".  I would like to thank the CodeCraft team -- [user:nir123,2019-02-02], [user:additya1998,2019-02-02], [user:devanshg27,2019-02-02], [user:gaurav172,2019-02-02], [user:night_fury208,2019-02-02], [user:shaanknight,2019-02-02], [user:psaini,2019-02-02], [user:sharmaritvik60,2019-02-02], [user:swetanjal,2019-02-02] and [user:vivace_jr,2019-02-02] -- for helping in preparation of the problemset. I would...

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Botomania 2022 Greetings! We are proud to invite you to **Botomania 2022** as a part of **Threads, Felicity IIIT Hyderabad**! Botomania 2022 is 2-day long event where you'll write programs (bots) to play a two-player board game. The exact rules of the game will be revealed at the start of the contest. Your bot will go against bots written by other contestants. Don't worry if your bot isn't perfect, it can win as long as it can beat the other contestants' bot! You'll have 48 hours to make your bot, and improve upon it throughout the period of the event. <img style="float: center;text-aligh: center;width: 500px;height: 500px" src="/predownloaded/92/89/9289f1f0acfc9f5bd22424a4211f80ef53ce4f53.png"> You can visualize the games that your bot is playing on our website and analyze them to improve your bot! All the bots will compete against each other after the 48 hours in a final tournament where the strongest bot shall prevail! This is an individual event and only Python submissions will ...

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Gordian Knot — Threads '16 (IIIT Hyderabad) I have an interesting problem for you.  Well, this is a problem from Gordian Knot '15. And, I shall be bold enough to assume that it succeeded in engrossing you :) Felicity Threads of IIIT Hyderabad would like to invite you to participate in Gordian Knot, a Project Euler style mathematical contest. For the real world counterparts of Charlie Eppes, of Numb3rs, this contest promises to be an enthralling experience especially if your forte is the field of mathematics and computing. **Contest Start: [0130 HRS IST (UTC +0530 HRS), January 10 2016](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Gordian+Knot+Start&iso=20160109T20&p1=%3A)** **Contest End: [0130 HRS IST (UTC +0530 HRS), January 11 2016](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Gordian+Knot+End&iso=20160110T20)** **[Click here to go to the contest](https://felicity.iiit.ac...

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Felicity IIIT H Hey! I would like to invite you all to participate in CodeCraft , Optimust conducted by IIIT Hyderabad. <h3>CodeCraft 2013</h3> <br/><br/> The online ACM style programming competition is all set to start on 17th February, 2013. It is an Individual Contest. Like past contests, we hope to have an interesting problemset which we hope that you guys will enjoy solving. Registrations for the online event "Codecraft" are open. Check it out at <a href="http://feli.co/cc">feli.co/cc</a><br/><br/> <a href="http://www.timeanddate.com/worldclock/fixedtime.html?msg=Codecraft+2013&iso=20130217T1430&p1=176&ah=5%22">Check your Timezone</a>(NOTE : Time updated) <br/> <h3>Optimust 2013</h3><br/><br/> Compete against top coders from around the world to write the most efficient and the smallest of codes! Optimust tests your memory , time and code optimization skills. You are required to solve simple problems online, in constrained time and space.Event Timings 16th February, 2013 ...

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Invitation to Programming Contest Hello,<br><br>The International Institute of Information Technology, Hyderabad, India<br>cordially invites you to be a part of Felicity, the annual cultural and<br>technical festival, to be held from 18th - 20th February, 2011.<br><br>1) <b>CodeCraft</b><br><br>CodeCraft, the online programming competition is all set to start on<br>6th February 2011. Codecraft requires eight hours of brainstorming over<br>some of the toughest algorithms challenges from various fields of Computer<br>Science.<br><br>Where : <a href="http://felicity.iiit.ac.in/codecraft/">http://felicity.iiit.ac.in/codecraft/</a><br>When&nbsp; : 6th February 2011, 2 pm - 10 pm IST(GMT +5:30).<br><br>2) <b>Time Limit Exceeded</b><br><br>This is an unusual programming event which emphasizes on solving problems<br>under special constraints. The event is based on C/C++ with the scoring<br>depending on factors like code length, deviation from the best available<br>solution, or even the number of semi-colons and whitespaces use...

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Gordian Knot- Mathematical Contest Felicity Threads, the tenth annual edition of computing festival of IIIT Hyderabad is back. Presenting the first event of Threads, Gordian Knot, with intriguing problems in mathematics and computing, inspired by Project Euler. All problems will require some mathematical ingenuity and programming experience. So be prepared to untangle some tough mathematical knots. Total Prizes worth Rs. 20000. Please visit http://felicity.iiit.ac.in/~gordian_beta/test/ for more information. And register now at : http://felicity.iiit.ac.in/threads/register Event starts on 4th Jan '14 at 1600 hours (IST). Event ends on 5th jan '14 at 1900 hours (IST). check in your time zone : http://www.timeanddate.com/worldclock/fixedtime.html?msg=Gordian+Knot&iso=20140104T16&p1=771

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Invitation to Fool's Programming 2020 Love the thrills of a programming contest but bored by the monotonous pattern of normal contests. Have a knack for finding clues and thinking laterally, we are proud to present Fool’s Programming 2020 as a part of Threads, Felicity IIIT Hyderabad. The problems can not only have unusual solutions, but will also have bizarre problem statements that can make one scratch their brains. Deciphering the questions will be more challenging than solving them. You'll need eagle eyes to spot the clues and hints hidden in the questions posed to you. Hope you can think on the same plane as the setters ;) PS &mdash; We have prizes reserved for first year students of IIIT-Hyderabad. Contest Link : [https://www.codechef.com/FOLG2020](https://www.codechef.com/FOLG2020) The authors to blame are: [user:arn_kap,2020-02-05], [user:riz_1_,2020-02-05] and [user:anant_1234,2020-02-05] 

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Cache-In by IIIT-Hyderabad @Felicity 2k13 Hi, IIIT-Hyderabad presents the most fun frolic event of Felicity '13 : Cache-In. Register yourselves at : http://feli.co/cache-in Event timings : Feb 12, 8:00pm onwards. (24 hr event) Description : Cache-in is an exciting fun filled sequence of questions, ranging from general knowledge to presence of mind. Use your knowledge, be on the look out and win some easy prizes! But, beware, the route is not so easy after-all! The questions are tough! Find Felicity at : http://feli.co Follow Felicity on Facebook : https://www.facebook.com/felicity.iiith

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Invitation To Fool's Programming Contest 2018 After successfully organizing CodeCraft, Felicity 2018 presents [Fool's Programming](https://felicity.iiit.ac.in/threads/Fools-Programming/). It's an unusual Coding contest for puzzle lovers hosted on CODECHEF. It is based on concept of April Fool's contest on Codeforces. The problems can not only have unusual solutions, but can also have bizarre problem statements that can make one scratch their brains. Deciphering the questions can at times be more challenging than solving them. To enjoy competing in this round, along with basic programming skills, you'll need eagle eye to spot the clues and hints hidden in the questions posed to you. The contest will be hosted on [CODECHEF](https://www.codechef.com/FOPR2018) on the[ Tuesday, 23rd of January, 20:05 PM IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Fools+Programming+%2718&iso=20180123T2005&p1=505). 

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Gordian Knot -- Felicity IIIT Hyderabad Hi, I would like to invite you all to participate in Gordian Knot, conducted by IIIT Hyderabad. Gordion Knot 2013 is an online event which consists of solving mathematical puzzles, which may even test your programming skills. <br/> Link : <a href="http://feli.co/math">feli.co/math</a><br/> <a href="http://www.timeanddate.com/worldclock/fixedtime.html?msg=Gordian+Knot+2013&iso=20130221T15&p1=771&ah=12">Check your Timezone</a> <br/><br/>

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Kode Konudrums <div><meta charset="utf-8"><span class="Apple-style-span" style="color: rgb(59, 49, 49); font-family: Arial, times, 'Lucida Sans Unicode', sans-serif; font-size: 17px; ">Kode Konundrums is a technical event conducted as a part of&nbsp;<span class="special" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">Threads</span>, the techfest at IIIT Hyderabad's&nbsp;<a href="http://felicity.iiit.ac.in/" class="special" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; color: rgb(18, 52, 86); text-decoration: none; ">Felicity</a>. This event is a fusion of puzzles and programming. The main idea is to use programming to solve riddles which are difficult or can't be solved otherwise. Knowledge of scripting languages like Python, Perl, Bash, PHP or C, Java.. whatever, will be usefu...

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Codecraft 2012 — Felicity IIITH Hey! I would like to invite you all to participate in CodeCraft, conducted by IIIT Hyderabad.<br/> CodeCraft 2012, the online ACM style programming competition is all set to start on 11th February, 2012. It is an Individual Contest. A test run will be held on 10th February at 6:00 PM (IST : GMT+5:30).<br/> Like past contests, we hope to have an interesting problemset which we hope that you guys will enjoy solving.<br/> Where : [http://felicity.iiit.ac.in/codecraft](http://felicity.iiit.ac.in/codecraft)<br/> When : 11th February , 2012 , 6 pm --- 12 pm IST(GMT +5:30).<br/> [Click Here for Your TimeZone](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Codecraft+2012&iso=20120211T18&p1=54&ah=6)<br/>

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