Updates on curtailing plagiarism

ashnub425 · March 22, 2023, 6:05pm

kofin · March 22, 2023, 6:27pm

START82D:
Plagiarised code on Problem ALIKE_THEM:

honest_dude · March 24, 2023, 12:44pm

@admin

Kindly look at below telegram channels which provides solutions while contest is ongoing. Kindly look at these channels before they may can change links/names.

Telegram: Contact @codeforces99 [Paid Solution Provider]
https://t.me/codechefalive[Paid]

These Channels directly provide solutions to users either on demand(Payment) or free of cost.

ankurkr03 · March 25, 2023, 10:42am

good

ashnub425 · March 28, 2023, 2:07pm

i saw the leaderboard for above screenshot with all submissions disqualified but ranking remains in top 100 how is it possible?
Its totally unfair.
@admin plz look into this check rank 5,7,8,9,13

admin · March 29, 2023, 10:40am

The ranklist will look like this till the plagiarism process is over for that contest. For START82, it should be over soon.

shubham27dec · March 30, 2023, 7:20pm

Ratings would also update right once the plagiarism process is completed… the ratings of honest contestants really goes down in the final hour of the contest because of these cheaters.

admin · March 30, 2023, 7:48pm

That is done after a month.

ashnub425 · April 5, 2023, 5:08pm

List of plagiarized submissions in problem AWESUM_OR (START84D):
1)CodeChef: Practical coding for everyone
2)CodeChef: Practical coding for everyone
3)CodeChef: Practical coding for everyone
4)CodeChef: Practical coding for everyone
5)CodeChef: Practical coding for everyone
6)CodeChef: Practical coding for everyone
7)CodeChef: Practical coding for everyone

@admin plz ban these users with more than 3 plag marks
@admin plz update the rating and plagiarized users before next contest starts
I am very worried that rating hasn’t updated after the removal of cheaters from START82

honest_dude · April 12, 2023, 4:45pm

#include <bits/stdc++.h>
using namespace std;

#define int long long

bool isOK(int p, int k, vector<vector> &a, vector<vector> &dp)
{
int n = a.size() - 1;
int m = a[0].size() - 1;

bool ok = false;
for (int i = 1; i <= n; i++)
    for (int j = 1; j <= m; j++)
    {
        if (a[i][j] == 0)
            continue;

        int x1 = max(1LL, i - p);
        int y1 = max(1LL, j - p);
        int x2 = min(n, i + p);
        int y2 = min(m, j + p);

        int sum = dp[x2][y2] - dp[x2][y1 - 1] - dp[x1 - 1][y2] + dp[x1 - 1][y1 - 1];
        if (sum >= k)
            ok = true;
    }

return ok;

}

signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);

int t = 1;
cin >> t;
while (t--)
{
    int n, m, k;
    cin >> n >> m >> k;
    k++;

    int sum = 0;
    vector<vector<int>> a(n + 1, vector<int>(m + 1));
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
        {
            cin >> a[i][j];
            sum += a[i][j];
        }

    vector<vector<int>> dp(n + 1, vector<int>(m + 1));
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
        {
            dp[i][j] = a[i][j];
            dp[i][j] += dp[i][j - 1];
            dp[i][j] += dp[i - 1][j];
            dp[i][j] -= dp[i - 1][j - 1];
        }

    if (sum < k)
    {
        cout << -1 << endl;
        continue;
    }

    int lo = 0, hi = max(n, m), md;
    while (lo < hi)
    {
        md = (lo + hi) / 2;
        if (isOK(md, k, a, dp))
            hi = md;
        else
            lo = md + 1;
    }

    cout << lo << endl;
}

}

TripTastic Plagged code

Kindly ban all who used this code for cheating in Triptastic. I have posted after Contest.

guptaharsh23 · April 12, 2023, 4:54pm

I am very sad due to online cheating , I was able to solve 3 question in div2 within 35 minute , after that i have given lots of time in 4th question but not able to solve further . My rating decreases due to cheating .

Got to know that cheating was happening in telegram , please check these 2 telegram link where cheating is happening . I have reported these channels , everyone please go and report .

honest_dude · April 12, 2023, 4:55pm

https://www.codechef.com/viewsolution/94355033
https://www.codechef.com/viewsolution/94354405
https://www.codechef.com/viewsolution/94354717
https://www.codechef.com/viewsolution/94354967
https://www.codechef.com/viewsolution/94354999
https://www.codechef.com/viewsolution/94354522
https://www.codechef.com/viewsolution/94354525
https://www.codechef.com/viewsolution/94354586
https://www.codechef.com/viewsolution/94354653
https://www.codechef.com/viewsolution/94354671

Every Solution in div 2 and div3. I checked for div2 and div3 only right now . Every solution is same as I posted above. All are doing Copy paste, Changing names. Why no action? Previous time no action was taken?

anon96194809 · April 12, 2023, 7:47pm

EPANLNK plagiarised code

Crazy Bishops on Chessboard plagiarised code

TELEGRAM group link: Telegram: Join Group Chat
@admin Please look into this and ban users having the same code as in the above images and get this telegram group deleted ASAP.

anon13454071 · April 14, 2023, 3:51pm

I got wrongly plagiarized, please don’t down my ratings. You can check my previous records. I had never been indulge in this type of activity.
It took months and years hard work to achieve this rating. please don’t down my ratings.

rohitzerofour · April 14, 2023, 3:30pm

I received a mail stating that i have been penalized for plagiarism in starters 85 div3 but I haven’t done anything wrong and I am confident of that.
My Solution:
https://www.codechef.com/viewsolution/94257040

I just copied part of code from internet which was publicly available before the contest began. And I am mentioning the source below and I think the others might have done the same.
Source:

gist.github.com

https://gist.github.com/ar-pa/957297fb3f88996ead11

BigInt.cpp

// In the name of Allah.
// We're nothing and you're everything.
// Ya Ali!
 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
const int maxn = 1e2 + 14, lg = 15;

This file has been truncated. show original

plag_checker · April 19, 2023, 4:58pm

https://www.codechef.com/viewsolution/94750132
https://www.codechef.com/viewsolution/94794658
https://www.codechef.com/viewsolution/94797942
https://www.codechef.com/viewsolution/94793249
https://www.codechef.com/viewsolution/94792259

@admin do you any clarification about this solution
source for code

kofin · April 19, 2023, 5:23pm

vips_7 · April 19, 2023, 5:19pm

I saw on youtube after the contest(Starter 86) that one video has 1.4k views on 3rd problem’s solution.
This means let’s consider 1200 peoples wrote code from this and there was 2400 submission on that problem in the contest there are also other videos also for this problem. and also telegram channels.
So, there would approx just 200 genuine submissions.
Just because of this, our ratings are decreasing after solving 4 problems in div3.

Please take strict action CodeChef @admin .

nehak_21 · April 20, 2023, 3:31pm

No. of users penalized in the last 10 contests:

START85 - 489
START84 - 1013
START83 - 1153
START82 - 993
START80 - 1112
START79 - 886
START78 - 794
START77 - 1612
COOK144 - 1390
START76 - 1031

honest_dude · April 23, 2023, 6:29am

What about source of Plagiarism Telegram channels and some YouTube channels. Can you take some actions against them? or can ask telegram to put them down? Is there any way to do so?