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.
If you want to report a Youtube channel, or Telegram group or something similar which is publishing solutions during a contest, please fill this form.

@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.

Total number of penalizations since 1st Jan 2022: 1,09,100

No. of users penalized in each contest:

START100B - 18
START100C - 62
START100D - 1183

START99A - 1
START99B - 29
START99C - 74
START99D - 379

START98B - 20
START98C - 126
START98D - 689

START97A - 2
START97B - 24
START97C - 84
START97D - 621

START96B - 19
START96C - 92
START96D - 466

START95B - 38
START95C - 156
START95D - 550

START94B - 27
START94C - 183
START94D - 957

START93B - 25
START93C - 59
START93D - 183

START92B - 20
START92C - 113
START92D - 418

START91B - 15
START91C - 166
START91D - 550

START90A - 2
START90B - 22
START90C - 86
START90D - 350

START89B - 12
START89C - 30
START89D - 201

START88B - 10
START88C - 40
START88D - 214

START87B - 28
START87C - 104
START87D - 242

START86B - 34
START86C - 134
START86D - 657

START85B - 31
START85C - 99
START85D - 359

START84A - 1
START84B - 59
START84C - 295
START84D - 658

START83B - 16
START83C - 120
START83D - 1017

START82B - 19
START82C - 111
START82D - 863

START81 - Unrated

START80B - 47
START80C - 143
START80D - 922

START79B - 36
START79C - 123
START79D - 727

START78B - 21
START78C - 96
START78D - 677

START77B - 53
START77C - 343
START77D - 1216

COOK144B - 38
COOK144C - 144
COOK144D - 1249

START76B - 38
START76C - 188
START76D - 793

START75B - 63
START75C - 175
START75D - 648

START74B - 38
START74C - 92
START74D - 886

JAN231A - 3
JAN231B - 16
JAN231C - 183
JAN231D - 642

START73B - 16
START73C - 93
START73D - 445

START72A - 1
START72B - 37
START72C - 157
START72D - 494

START71B - 19
START71C - 54
START71D - 428

START70A - 1
START70B - 25
START70C - 56
START70D - 524

START69B - 20
START69C - 88
START69D - 668

DEC221C - 146
DEC221D - 409

START68B - 22
START68C - 90
START68D - 500

START67B - 19
START67C - 62
START67D - 272

START66B - 12
START66C - 103
START66D - 455

START65B - 40
START65C - 100
START65D - 938

NOV221C - 156
NOV221D - 743

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

START63B - 24
START63C - 120
START63D - 863

START62B - 15
START62C - 22
START62D - 561

START61B - 84
START61C - 137
START61D - 1025

START60B - 68
START60C - 200
START60D - 707

OCT221C - 108
OCT221D - 801

START59B - 44
START59C - 81
START59D - 561

START58C - 95
START58D - 785

LTIME112B - 23
LTIME112C - 81
LTIME112D - 373

START57C - 115
START57D - 444

START56B - 74
START56C - 240
START56D - 1404

SEP221C - 393
SEP221D - 1437

START55B - 125
START55C - 183
START55D - 654

START54C - 141
START54D - 563

START53B - 307
START53C - 255
START53D - 661

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

START52C - 289
START52D - 873

AUG221C - 475
AUG221D - 1063

START51B - 245
START51C - 405
START51D - 960

START50B - 273
START50C - 373
START50D - 1033

START49B - 175
START49C - 247
START49D - 595

JULY222C - 366
JULY222D - 1160

START48B - 145
START48C - 170
START48D - 506

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

START47B - 73
START47C - 109
START47D - 498

JULY221C - 123
JULY221D - 581

START46B - 104
START46C - 143
START46D - 467

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

START45B - 163
START45C - 209
START45D - 603

JUNE222C - 197
JUNE222D - 780

START44B - 88
START44C - 159
START44D - 730

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

START43B - 75
START43C - 143
START43D - 577

JUNE221C - 201
JUNE221D - 1029

START42B - 35
START42C - 60
START42D - 335

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

START41B - 35
START41C - 71
START41D - 382

START40 - Unrated

MAY222C - 219
MAY222D - 810

START39B - 102
START39C - 133
START39D - 508

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

START38B - 41
START38C - 47
START38D - 305

MAY221C - 344
MAY221D - 1786

START37B - 35
START37C - 186
START37D - 888

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

START36B - 51
START36C - 71
START36D - 327

APRIL222C - 224
APRIL222D - 1065

START35B - 82
START35C - 136
START35D - 489

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

START34B - 143
START34C - 257
START34D - 1157

APRIL221C - 491
APRIL221D - 1921

START33B - 190
START33C - 380
START33D - 1169

COOK140B - 160
COOK140C - 323
COOK140D - 988

START32B - 241
START32C - 351
START32D - 927

MARCH222C - 525
MARCH222D - 1140

START31B - 235
START31C - 225
START31D - 475

LTIME106A - 5
LTIME106B - 275
LTIME106C - 319
LTIME106D - 504

START30B - 516
START30C - 697
START30D - 1230

MARCH221C - 310
MARCH221D - 688

START29B - 469
START29C - 459
START29D - 802

COOK139A - 1
COOK139B - 270
COOK139C - 300
COOK139D - 576

START28B - 337
START28C - 249
START28D - 305

LTIME105A - 2
LTIME105B - 112
LTIME105C - 109
LTIME105D - 170

START27B - 347
START27C - 256
START27D - 580

COOK138A - 2
COOK138B - 456
COOK138C - 472
COOK138D - 765

START26C - 127
START26D - 135

FEB222C - 1623

START25B - 234
START25C - 403

FEB221C - 721

START24B - 452
START24C - 497

LTIME104B - 249
LTIME104C - 588

START23C - 512

COOK137A - 2
COOK137B - 312
COOK137C - 397

START22B - 581
START22C - 721

JAN222C - 858

EXUN21B - 199
EXUN21C - 377

JAN221C - 907

START21B - 190
START21C - 169

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 ):-

CodeChef: Practical coding for everyone (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 : CodeChef: Practical coding for everyone

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