Hey everbody.

Hello 2015 is a Div.1 + Div.2 contest that will be held in gym soon. As I said, there will be 2 divisions and in each divisions, users of that division can participate ( ( - ∞, 1699] and [1700, 9999]). So, anybody who participates in the wrong division will be out of competition (manually).

Duration is 3 hours and there will be 6 problems in each division. Last 4 problems of Div.2 will be same as first 4 problems of Div.1 . Problems are written by me (PrinceOfPersia) and tester's M.Mahdi.

The problems will be sorted according to the estimated order of difficulty according to my opinion but I strongly recommend you to read all of the problems.(sentence from matrix :D).

Problems are more Olympiad style than ACM. I hope you enjoy them.

It takes a while to prepare all problems. So, this contest is not in the gym contests list yet.

Oh, I almost forgot this : the main character of all problems will be my friend, De Prezer :)

UPD: Problems are designed for single participant (as mathlover said), so teams will participate out of competition too.

UPD2: It's in the gym contests list now.

UPD3: For making the contest more interesting, the winner of each division, gets a kiss ;)

UPD4: Round was delayed by 10 minutes for some technical reasons.

UPD5: Contest is over.

Congratulation to all winers specially sankear who solved all Div.1 problems.

Div.1 winners :

1.sankear

2.ikbal

3.kraskevich

4.tourist

5.dreamoon_love_AA

Div.2 winners :

1.cthbst

2.peterpan

3.que_roin

Now it's time to sankear and cthbst kiss each other ;)

See you in next rounds, good luck and have fun.

UPD6: Well, recently I'm a little busy and I'll just post some keywords and tags but maybe I'll write an editorial some time.

Div.2 A : Binary search, B : Partial sum

Div.1 A : Binary search, B : Dijkstra, C : DP,Two pointers,queue, D : 2-sat, E: Hash, Segment tree, F : Divide and Conquer.

UPD7: You can find the editorial here.

Hello everyone.

Soon, On the night after the Halloween, there will be a Codeforces gym contest, named Crypto cup 1.0.

Like its name, it's a cryptography contest and for all problems, you are given some sample encryptions encrypted using a certain algorithm and you have to write a program to decrypt the given messages.

There will be 18 problems and you have 6:30 hours to solve them. I hope it will be interesting.

Problems are prepared by me (PrinceOfPersia) and tested by Damon also thanks HosseinYousefi for editing problem statements.

For practicing cryptography, we recommend SecutiryOverRide's cryptography challenges.

Also, this round needs a little Algorithm and CS knowledge.Don't forget to pay attention to problem's titles, they might be helpful ;)

Currently, problems are being prepared, so you're unable to see the contest in gym contest list yet.

Problems are in decreasing order of difficulty.

UPD: Duration has been increased by half an hour, now it's 6:30 .

UPD2: Please note that contest will be held on November 1st, because it had overlap with Shahid Beheshti University ACM.

UPD3: Now it's in the Gym contests list.

UPD4: Registration is open.

UPD5: Contest is over.

I hope you enjoyed the problems.

Congratulation to the winners who solved all the problems :

1. I_love_Hoang_Yen

2. Team Flareon : Localhost, DiEvAl, Visconte

3. kennethsnow

4. niklasb

5. 135678942570

Complete standing

Be aware, our standard rounds are coming... ;)

Hello.Today I opened http://codeforces.com/contest/238/standings/friends/true and saw a funny thing.

havaliza is in it about 5 times.Is that a bug or what ?