I’m going to share with you my story in today’s contest. After the system test and getting my A B C problems accepted, I was surprised of being removed from the standings board and having my problems skipped. Thanks to Mike Mirzayanov, I knew that there was a cheating incident on my profile, as my solution for problem A was identical to pashka921’s.↵
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My solution: [http://mirror.codeforces.com/contest/740/submission/22428028](http://mirror.codeforces.com/contest/740/submission/22428028) (19:39:33)↵
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Solution of pashka921: [http://mirror.codeforces.com/contest/740/submission/22428017](http://mirror.codeforces.com/contest/740/submission/22428017) (19:39:28)↵
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The 2 solutions are completely IDENTICAL and There is no probability that this situation happened by coincidence. FYI, his submission was before mine by 5 seconds exactly.↵
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**First, I’m going to prove that pashka921 is cheating:**↵
1. At every page of submission on his profile ([http://mirror.codeforces.com/submissions/pashka921](http://mirror.codeforces.com/submissions/pashka921)), there are some skipped problems, which means that it’s not the first time he cheated.↵
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2. In today’s contest, he made 2 submissions for problem A, with 2 TOTALLY DIFFERENT codes (he got a WA in the first one, and the second one was actually with my code and was accepted):↵
- [http://mirror.codeforces.com/contest/740/submission/22427837](http://mirror.codeforces.com/contest/740/submission/22427837) (19:37:42)↵
- [http://mirror.codeforces.com/contest/740/submission/22428017](http://mirror.codeforces.com/contest/740/submission/22428017) (19:39:28)↵
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3. By looking at other submissions that this person did, in codeforces round 367 div 2, between time 20:36:09 and time 20:40:13, he was able to make 2 submissions with two TOTALLY different codes, within a time interval of 4 minutes between both:↵
- [http://mirror.codeforces.com/contest/706/submission/19802252](http://mirror.codeforces.com/contest/706/submission/19802252) (20:36:09)↵
- [http://mirror.codeforces.com/contest/706/submission/19803051](http://mirror.codeforces.com/contest/706/submission/19803051) (20:40:13)↵
Even between both timestamps, he made a submission to problem D at time 20:39:31↵
[http://mirror.codeforces.com/contest/706/submission/19802924](http://mirror.codeforces.com/contest/706/submission/19802924)↵
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4. These are not the ONLY weird cases found. You can check his profile, and you can spot them easily.↵
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**How was he able to submit my code?**↵
During contests, I use the online editor [www.ideone.com](www.ideone.com) for coding. Those are the links for Problems A and C that I wrote during today’s contest:↵
My problem C: [http://ideone.com/ekrSy6](http://ideone.com/ekrSy6) ↵
My problem A: [http://ideone.com/qvPbwk](http://ideone.com/qvPbwk) ↵
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The code for problem A was available on ideone at 19:39:20 (You can open the source of the HTML page and search for “created” and spot the timestamp), so:↵
Code was available on ideone at: 19:39:20↵
His submission at: 19:39:28 ↵
Mine at: 19:39:33↵
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For my submission: http://ideone.com/qvPbwk, I am taking a screenshot of my browser to prove that I’m the OWNER of this code. ↵
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Notes:↵
- Having the edit button means that I’m the owner of the code.↵
- 19:39:20 is GMT+2↵
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Just to sum up, this was my experience today. Please be careful whenever you use online IDEs during the contest, as your code may be exposed publicly.↵
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My solution: [http://mirror.codeforces.com/contest/740/submission/22428028](http://mirror.codeforces.com/contest/740/submission/22428028) (19:39:33)↵
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Solution of pashka921: [http://mirror.codeforces.com/contest/740/submission/22428017](http://mirror.codeforces.com/contest/740/submission/22428017) (19:39:28)↵
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The 2 solutions are completely IDENTICAL and There is no probability that this situation happened by coincidence. FYI, his submission was before mine by 5 seconds exactly.↵
↵
**First, I’m going to prove that pashka921 is cheating:**↵
1. At every page of submission on his profile ([http://mirror.codeforces.com/submissions/pashka921](http://mirror.codeforces.com/submissions/pashka921)), there are some skipped problems, which means that it’s not the first time he cheated.↵
↵
2. In today’s contest, he made 2 submissions for problem A, with 2 TOTALLY DIFFERENT codes (he got a WA in the first one, and the second one was actually with my code and was accepted):↵
- [http://mirror.codeforces.com/contest/740/submission/22427837](http://mirror.codeforces.com/contest/740/submission/22427837) (19:37:42)↵
- [http://mirror.codeforces.com/contest/740/submission/22428017](http://mirror.codeforces.com/contest/740/submission/22428017) (19:39:28)↵
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3. By looking at other submissions that this person did, in codeforces round 367 div 2, between time 20:36:09 and time 20:40:13, he was able to make 2 submissions with two TOTALLY different codes, within a time interval of 4 minutes between both:↵
- [http://mirror.codeforces.com/contest/706/submission/19802252](http://mirror.codeforces.com/contest/706/submission/19802252) (20:36:09)↵
- [http://mirror.codeforces.com/contest/706/submission/19803051](http://mirror.codeforces.com/contest/706/submission/19803051) (20:40:13)↵
Even between both timestamps, he made a submission to problem D at time 20:39:31↵
[http://mirror.codeforces.com/contest/706/submission/19802924](http://mirror.codeforces.com/contest/706/submission/19802924)↵
↵
4. These are not the ONLY weird cases found. You can check his profile, and you can spot them easily.↵
↵
**How was he able to submit my code?**↵
During contests, I use the online editor [www.ideone.com](www.ideone.com) for coding. Those are the links for Problems A and C that I wrote during today’s contest:↵
My problem C: [http://ideone.com/ekrSy6](http://ideone.com/ekrSy6) ↵
My problem A: [http://ideone.com/qvPbwk](http://ideone.com/qvPbwk) ↵
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The code for problem A was available on ideone at 19:39:20 (You can open the source of the HTML page and search for “created” and spot the timestamp), so:↵
Code was available on ideone at: 19:39:20↵
His submission at: 19:39:28 ↵
Mine at: 19:39:33↵
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For my submission: http://ideone.com/qvPbwk, I am taking a screenshot of my browser to prove that I’m the OWNER of this code. ↵
↵
Notes:↵
- Having the edit button means that I’m the owner of the code.↵
- 19:39:20 is GMT+2↵
↵
Just to sum up, this was my experience today. Please be careful whenever you use online IDEs during the contest, as your code may be exposed publicly.↵
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