Updates on curtailing plagiarism

admin · January 18, 2022, 12:31pm

Hi all - We will use this thread to update the community about plagiarism checks currently running on the platform.

We intend to ensure that plagiarism checks and points deduction for cheaters happens within 15 - 20 days of completion of each rated contest. We will publish relevant stats here.
While we will try our best to ensure that cheaters are caught, we may miss out on a few. We will start out by penalizing only the most obvious cases. We request everyone to report plagiarism cases on help@codechef.com within 3 days of each contest.
Plagiarism for the past contests will be undertaken in the coming few months.

@all appealing against plagiarism emails that was sent to you. Click here.

You would have received an email for every contest that you have been accused of plagiarism in. That email explicitly talks about how you can appeal against the accusation, and gives a particular time period for appeals, and ratings are dropped only after that period is over. And if you have replied within that time period, your ratings will not be dropped until all of your emails are read, the submissions pairs manually verified, and your email replied to.

So, search for that email and reply to it. If you can’t find the email for some reason, send an email to help@codechef.com. And wait for at least 3 weeks to get a reply - there are hundreds of appeals that have to be looked at, and it takes time. Posting on discuss isn’t going to help you.

But do note that if you send an email, and we find that it’s a frivolous appeal, we might permanently ban your account. So don’t email and waste our time if you have cheated.

Stats for CDRV2021:

71 users penalized 275 points each
1 appeal rejected. None accepted

Stats for START21, JAN221, EXUN2021, JAN222 & START22:

No. of users penalized -

START21B - 190
START21C - 169
JAN221C - 907
EXUN21B - 199
EXUN21C - 377
JAN222C - 858
START22B - 581
START22C - 721

Stats for COOK137:

No. of users penalized -

COOK137A: 2
COOK137B: 312
COOK137C: 397

Stats for LTIME104:

No. of users penalized -

LTIME104B: 249
LTIME104C: 588

Stats for START23:

No. of users penalized -

START23C: 512

Stats for FEB221 & START25:

No. of users penalized -

FEB221C: 721
START25B: 234
START25C: 403

Stats for START24:

No. of users penalized -

START24B: 452
START24C: 497

Stats for FEB222 & START26:

No. of users penalized -

FEB222C: 1623
START26C: 127
START26D: 135

Stats for COOK138, START27 & LTIME105:

No. of users penalized -

COOK138A: 2
COOK138B: 456
COOK138C: 472
COOK138D: 765
START27B: 347
START27C: 256
START27D: 580
LTIME105A: 2
LTIME105B: 112
LTIME105C: 109
LTIME105D: 170

Stats for START28 & COOK139:

No. of users penalized -

START28B: 337
START28C: 249
START28D: 305
COOK139A: 1
COOK139B: 270
COOK139C: 300
COOK139D: 576

Stats for START29:

No. of users penalized -

START29B: 469
START29C: 459
START29D: 802

Stats for MARCH221:

No. of users penalized -

MARCH221C: 310
MARCH221D: 688

Stats for START30:

No. of users penalized -

START30B: 516
START30C: 697
START30D: 1230

Stats for LTIME106 & START31:

No. of users penalized -

LTIME106A: 5
LTIME106B: 275
LTIME106C: 319
LTIME106D: 504
START31B: 235
START31C: 225
START31D: 475

Stats for MARCH222:

No. of users penalized -

MARCH222C: 525
MARCH222D: 1140

Stats for START32:

No. of users penalized -

START32B: 241
START32C: 351
START32D: 927

Stats for COOK140:

No. of users penalized -

COOK140B: 160
COOK140C: 323
COOK140D: 988

Stats for START33:

No. of users penalized -

START33B: 190
START33C: 380
START33D: 1169

Stats for APRIL221:

No. of users penalized -

APRIL221C: 491
APRIL221D: 1921

Stats for START34:

No. of users penalized -

START34B: 143
START34C: 257
START34D: 1157

Stats for LTIME107:

No. of users penalized -

LTIME107A: 0
LTIME107B: 62
LTIME107C: 163
LTIME107D: 570

Stats for START35:

No. of users penalized -

START35B: 82
START35C: 136
START35D: 489

Stats for APRIL222:

No. of users penalized -

APRIL222C: 224
APRIL222D: 1065

Stats for START36:

No. of users penalized -

START36B: 51
START36C: 71
START36D: 327

Stats for COOK141:

No. of users penalized -

COOK141A: 1
COOK141B: 70
COOK141C: 143
COOK141D: 988

Stats for START37:

No. of users penalized -

START37B: 35
START37C: 186
START37D: 888

Stats for MAY221:

No. of users penalized -

MAY221C: 344
MAY221D: 1786

Stats for START38:

No. of users penalized -

START38B: 41
START38C: 47
START38D: 305

Stats for LTIME108:

No. of users penalized -

LTIME108A: 1
LTIME108B: 92
LTIME108C: 128
LTIME108D: 593

Stats for START39:

No. of users penalized -

START39B: 102
START39C: 133
START39D: 508

Stats for MAY222:

No. of users penalized -

MAY222C: 219
MAY22D: 810

Stats for START41:

No. of users penalized -

START41B: 35
START41C: 71
START41D: 382

Stats for COOK142:

No. of users penalized -

COOK142A: 2
COOK142B: 58
COOK142C: 54
COOK142D: 336

Stats for START42:

No. of users penalized -

START42B: 35
START42C: 60
START42D: 335

No. of users penalized -

JUNE221C: 201
JUNE221D: 1029

START43B: 75
START43C: 143
START43D: 577

LTIME109A: 2
LTIME109B: 77
LTIME109C: 108
LTIME109D: 632

START44B: 88
START44C: 159
START44D: 730

JUNE222C: 197
JUNE222D: 780

START45B: 163
START45C: 209
START45D: 603

COOK143A: 0
COOK143B: 61
COOK143C: 107
COOK143D: 441

START46B: 104
START46C: 143
START46D: 467

JULY221C: 123
JULY221D: 581

START47B: 73
START47C: 109
START47D: 498

LTIME110A: 1
LTIME110B: 119
LTIME110C: 133
LTIME110D: 535

START48B: 145
START48C: 170
START48D: 506

JULY222C: 366
JULY222D: 1160

START49B: 175
START49C: 247
START49D: 595

START50B: 273
START50C: 373
START50D: 1033

START51B: 245
START51C: 405
START51D: 960

AUG221C: 475
AUG221D: 1063

START52C: 289
START52D: 873

LTIME111A: 2
LTIME111B: 329
LTIME111C: 192
LTIME111D: 495

START53B: 307
START53C: 255
START53D: 661

START54C: 141
START54D: 563

START55B: 125
START55C: 183
START55D: 654

SEP221C: 393
SEP221D: 1437

START56B: 74
START56C: 240
START56D: 1404

START57C: 115
START57D: 444

LTIME112B: 23
LTIME112C: 81
LTIME112D: 373

START58C: 95
START58D: 785

START59B: 44
START59C: 81
START59D: 561

OCT221C: 108
OCT221D: 801

START60B: 68
START60C: 200
START60D: 707

START61B: 84
START61C: 137
START61D: 1025

START62B: 15
START62C: 22
START62D: 561

START63B: 24
START63C: 120
START63D: 863

START64A: 2
START64B: 26
START64C: 48
START64D: 492

NOV221C: 156
NOV221D: 743

START65B: 40
START65C: 100
START65D: 938

START66B - 12
START66C - 103
START66D - 455

letsdosmtgdiff · January 18, 2022, 2:01pm

Great to Hear that . RIP Cheaters .
Hopefully the increase in submission count from 100 in 2nd hour to 2000 in last hour will become less frequent

zephxr · January 18, 2022, 2:05pm

If you are penalizing cheaters for a particular round, will the non-cheaters in that round be getting some increment in their current ratings ?

yaminote · January 18, 2022, 2:26pm

There are people who cheated in SnackDown and got their ratings increased no action on them yet.

tumhara_kaal · January 18, 2022, 2:49pm

To start off with , i have with you these insane cheaters who should be immediately banned from this platform for shamelessly cheating since the time they have been here . And I Hope you will take strict action against these people.

Here are these 2 dfs who got to 5 stars with this insane cheating and you can check that they cheated in every contest of yours :

@kirasac
@anon88283721

#their cheating highlights from the December lunchtime where unfortunately their tricks could’nt work :>
https://www.codechef.com/viewsolution/55391922
https://www.codechef.com/viewsolution/55425901

https://www.codechef.com/viewsolution/55425468
https://www.codechef.com/viewsolution/55393307

→ same stuff from INFTY2K21 :

https://www.codechef.com/viewsolution/55285375
https://www.codechef.com/viewsolution/55285596

https://www.codechef.com/viewsolution/55289661
https://www.codechef.com/viewsolution/55290131

Just See Their Ranks are almost same in every contest coz they used to submit one after the other.

What are your opinions on seeing the submissions of these people cheating so badly and what is the least punishments they should get : Comment your thoughts

letsdosmtgdiff · January 18, 2022, 3:36pm

Wth , these guys even cheated in div1 lunchtime too , and i just saw their profile that have been cheating from quite a long time with almost same ranks as you mentioned and still not caught . . .

emperor100 · January 18, 2022, 4:15pm

No

codingfreaq123 · January 18, 2022, 7:41pm

The last time plagiarism checks were done was on August 2020. Does past contests refer all that happened in between or only the latest ones ? @admin @cubefreak777

shaily_adm · January 19, 2022, 2:26pm

Hey!
We permanently banned accounts of ~ 2100 users in SnackDown 2021. We will keep posting updates for contests here as and when completed.

pkpawan123 · January 19, 2022, 5:28pm

I would suggest to look for last 700 submissions again most of them are cheaters in todays round .

Problem :- MERGEBS

prashant_th18 · January 19, 2022, 5:36pm

piyush_kuma · January 19, 2022, 5:53pm

I would like to add some more which are not in written in C++ but are clearly copied from similar sources.
https://www.codechef.com/viewsolution/56732555
https://www.codechef.com/viewsolution/56732516
https://www.codechef.com/viewsolution/56732412
https://www.codechef.com/viewsolution/56731937

letsdosmtgdiff · January 19, 2022, 5:54pm

This round needs serious investigation . Submissions of problem 4 increased from 298 to 850+ in the last half hour. So disappointing to see people doing this shit a lot

codingfreaq123 · January 19, 2022, 5:55pm

This round has totally gone out of hands @admin . Not just for MERGEBS but also for EQLIS.
Here are a list of submissions for EQLIS (Please look into it . They are 100% same ):-

Solution: 56699771 | CodeChef (TRIED to avoid plagiarism by adding unnecessary variables at line 26,27,28,32)

https://www.codechef.com/viewsolution/56700033
https://www.codechef.com/viewsolution/56695185
https://www.codechef.com/viewsolution/56689513
https://www.codechef.com/viewsolution/56702601
https://www.codechef.com/viewsolution/56712827

Even the indentation are same for some of them

codingfreaq123 · January 19, 2022, 6:08pm

This is hilariuos . I bet most of them dont even know what DP is XD XD

son_of_vvn · January 19, 2022, 6:10pm

Look at these solutions also
looks very similar or same to me.

Question link : Contest Page | CodeChef

https://www.codechef.com/viewsolution/56663186
https://www.codechef.com/viewsolution/56732409

codingfreaq123 · January 19, 2022, 6:17pm

XD XD XD XD
This solution was leaked on Youtube everywhere and the copied with their eyes closed @admin
Like forget about variable names, they didnt even bother to change the indentation.
Looks like almost everyones rating is about to decrease in this round XD XD.

zephxr · January 19, 2022, 6:33pm

Man, Cheating got started from starting itself. In the first hour, Submissions for problem B (Div.2) increased from 600 to 2000+.Submissions for Problem C and D also got increased exponentially.

letsdosmtgdiff · January 19, 2022, 6:54pm

Yeah ,but for a problem involving 2d dp and where greedy solution doesn’t work ,it sucks that so many undeserving noobs ,(among those the people who never even solved a simple dp problem ) even got placed better rank than you :(. FeelsBadMan

samyak015 · January 19, 2022, 7:02pm