Hello Codeforces, I want to report cheater from Codeforces Round #405 (rated, Div. 2, based on VK Cup 2017 Round 1). I want to thank authors of round too, great round!

Firstly, our cheater is anantheparty, it is easy to see that with looking submissions for problem E (here). jiangIy named fake account sent solution in 2017-03-18 20:23:02 and anantheparty sent in 2017-03-18 20:23:15, 13 second after. Hmm, you can think this is just coincidence. Let's see codes. Firstly, anantheparty's submission. Ok, normal code. Now we are going to see interesting part! Look jiangIy's submission from here (WARNING!! YOU CAN SCARE!!). I can feel you said WT!? :D. YES, THAT'S MOTHER OF CHEATING!!. I don't know how he did that (with program or just replacing :P) and I don't want to know :D. I tried to translate some part of code (especially last part), they are same, you can check too. This will be new idea for cheaters :P. But, guys, please don't do that!! Cheating will not give you anything besides rating!

I hope he will apologize and won't cheat again.

Thanks for reading. Good luck!

Sorry for poor English.

Hello Codeforces, I found some cheaters from Codeforces Round #403 (Div. 2, based on Technocup 2017 Finals). Lets see.

Firstly, cheaters are Jori and Panole23333333. Lets look their submission for problem B (A is easy problem, so most of users codes can look like each other). RealFan's submission and cwy1211's submission, names of most variables and algorithms are same. Ok, lets see submissions for C, RealFan's and cwy1211's, again, names of most variables are same and I have no idea why one of them changed name dfs to sc (what does sc mean?). Also some of them added this to code, but didn't use:

int QAQ=0;
	FOR(i,0,n-1) QAQ=max(QAQ,ans[i]);

Probably for not getting caught by system.

See their submissions for problem D, Realfan's and cwy1211's, again same kind of cheating but names of some variables are changed and one of them used const variable instead of 26... Shame on you Jori and Panole23333333! I hope you will not cheat again.

Probably I will update this entry and add more cheaters... Don't cheat!

Sorry for poor English.

Hello Codeforces, my last blogs name was "Why always there are cheaters from China?". Yes, it sounds racist but I couldn't express my ideas fully because of poor English. Actually that was my mistake, I apologize to you, especially Chinese, I swear I will not insult any country because of few cheaters. I think you will understand me.

Sorry.

Hello Codeforces, I'm back :)

Yesterday there was Divide by Zero 2017 and Codeforces Round #399 (Div. 1 + Div. 2, combined) and also cheaters...

Let's see.

Cheaters are tejavojjala, hybrid and shivamg_isc. They are from IIIT Allahabad university, they solved same problems and their solving time is similar. I want to pass problem A and B, because they are easy problems, but I want to note that shivamg_isc copied B from tejavojjala. Names of variables are changed.

Their solution for problem C: here, here and here. Codes are same, but little things changed...

For problem E hybrid's code is different, but other's code is same (submissions : here, here and here).

UPDATE: Users chill21 and born.kira are also cheaters! See their submissions for problem B, bombie's and chill21's. chill21 changed name of function recur to dfs :D How smarty. He did problem B with dfs :D. And born.kira wrote // Never Underestimate Yourself // on top of code, by cheating you are underestimating yourself...

Good luck and contests :) Don't cheat!

Sorry for poor English.

Hello CF, if you read my first post, you know me ;) . Lets see who "cheated".

I was looking standings of Codeforces Round #396 (Div. 2), then I saw interesting one, someone unrated solved just last problem. S/he solved problem in 1:19, so s/he had time to solve at least problem A. I guess that it's someone's fake account to check s/his solution.

See our fake account's submission here. Good, he managed to solve problem E.

Lets see who cheated, I saw him on comments many times, he is Whistle! YES! You can see him on standings here.

Lets look their submissions, this is Whistle's submission, and this is fake accounts. Same solution, but place of functions, names of some variables, arrays changed. Same things in functions. Like cheaters in my last post...

Sorry for poor English.

Hello everyone, I want to report 2 cheaters today.

2 days ago there was CF Round #395 Div2. I participated in contest also, problems were really good. Let's look standings. Hmm, good, 3 people solved all problems, 2 of them are Chinese. ljh2000 and MashiroSky. Ok, I looked their profiles, saw that they are living in same place, studying in same school. Hmm, it doesn't like coincidence. Then I looked their solutions.

Solutions for problem A: ljh2000's solution, and MashiroSky's solution. Looks similar, but it's easy problem, most peoples solutions looks same.

Solutions for problem B: ljh2000's solution, MashiroSky's solution. Hmm, looks similar, but it was easy also, let's see other solutions.

Solutions for problem C: ljh2000's solution and MashiroSky's solution. Yeah, do you see functions? Struct node with "tag" variable, same dfs function, same build function, same query function, same solve function and some of them wrote work function, and other one wrote things in work function in main. THEY'RE CHEATING HARD!!! How Codeforces couldn't catch this?

You can look other submissions too, they are same, but name of some variables changed, cheating like children...

When I see cheaters, I'm feeling sad for people who solved solutions legally, for example squaredog solved all problems too, but he couldn't be first reason of cheaters...

UPD BONUS CHEATERS: See 6th and 7th places there. Same story..

Sorry for poor English.