We would like to invite you to the third edition of Criterion 2020 Round. The round will start from 0900 UTC on 28 February 2020. Criterion rounds are being held once every two weeks and will have 5-6 problems over the duration of 2.5 hours. The contest will be hosted on Toph. You can register for the contest here.

The authors of the contest are: fsshakkhor, 0pangktey0, jAckAL_1586, Joty, TarifEzaz, I_love_ProParThinkNot and ishtupeed.

See you in the arena!

We would like to invite you to the second edition of Criterion 2020 Round. The round will start from 0900 UTC on 14 February 2020. Criterion rounds will be held once every two weeks and will have 6 problems over the duration of 2.5 hours. The contest will be hosted on Toph. You can register for the contest here.

The authors of the contest are: Anachor, mainstring, 0pangktey0, fsshakkhor, Joty, TarifEzaz, jAckAL_1586, I_love_ProParThinkNot and ishtupeed.

See you in the arena on Valentine's Day!

Dear Codeforces,

I am very excited to invite you to our first round of Criterion 2020 Round. The round will start from 0900 UTC on 31 January 2020. Criterion rounds will be held once every two weeks and will have 5-6 problems over the duration of 2.5 hours. You can register for the contest here.

The authors of the today's contest are: Dhruba10414, Hasinur_, Moshiur_, Shefin_, I_love_ProParThinkNot, Hasnaine_ and tanus_era.

See you in the arena!

Hello everyone,

We would like to invite you for the replay contest of Shahjalal University of Science and Technlogy Inter-University Programming Contest 2019. The contest will start from 1000 UTC on 1 May 2019 and will run for 5 hours. The contest will take place on Toph. You can register for the contest here.

The authors of problems of this contest include: I_See_You, Knight_of_Thirteen, triploblastic, codename27, rumman_sust, J-C, nodim, TarifEzaz, olee12, FORHAD-SUST-BD, mk_Shahriar, jAckAL_1586, Abdullah Al Maruf and Md. Saiful Islam Khan.

See you in the contest arena.

It's winter in Bangladesh and Toph is back with "Tough Winter Spar 2018" contest. The contest will start at 1200 UTC on 20 December 2018 and will run for 10 days. You can register for the contest anytime before or during the contest. The registration link is here.

The setters for this contest are: introverted, jAckAL_1586, fsshakkhor, I_See_You, Tanmoy_Datta, shahed_ahmed, BumbleBee, TarifEzaz, Evade_RAbid and Kitorp.

We would like to thank hjr265 for the amazing platform.

See you at the contest arena!

The replay of the BUET Inter-University contest is going to start from 1200 UTC today and will continue for five hours. The contest will take place on Toph.

The setters for this contest are: Shafaet, nfssdq, moinul.shaon, jehad131, kzr.buet08, ridowan007, Farsid, VUAcoder, Jhamra and shohag.

Good luck and have fun!

UPD 1: The final ranklist is here. Tutorials can be found here.

UPD 2: Problems are also available for upsolving here.

Can lightening strike twice? Yes it can!

When I first went to Div 1 in 2011, I went to bed happily. Next morning, I saw this post from Mike: http://mirror.codeforces.com/blog/entry/3064. The new rating system adjusted my rating, and my "color change" has only lasted about 12 hours or so. I remember the famous line from Mike's post, "but let's look ahead with optimism — new victories will bring the lost color back color and help to win the proud title of a Grandmaster!"

Let's not become grandmaster for the time being. I later managed to become Candidate Master somewhere in 2012, during my last year of ACM ICPC. After that, I became irregular in Codeforces. A few months back, I decided to take part in the CF rounds regularly, and in the last round, successfully regained my position in Div 1 again, and guess what happened next? You guessed it! The rating system changed again, and I was sent back to Div 2 again!

I understand that the changes are made for a reason, and I'm fine with that. Wishing high ratings to all the participants. :)