Cheaters Caught!! - Codeforces

#	User	Rating
1	tourist	3985
2	jiangly	3741
3	jqdai0815	3682
4	Benq	3529
5	orzdevinwang	3526
6	ksun48	3489
7	Radewoosh	3483
8	Kevin114514	3442
9	ecnerwala	3392
9	Um_nik	3392

#	User	Contrib.
1	cry	169
2	atcoder_official	162
2	maomao90	162
2	Um_nik	162
5	djm03178	158
6	-is-this-fft-	157
7	adamant	155
8	awoo	154
8	Dominater069	154
10	nor	150

So I was going through the standings in and around my rank in the last division 2 round and found 3 people cheating in this round. I was quite surprised that all of them passed the plagiarism tests even though they didnt even bother to change a single line of their code that is quite surprising. Are the plagiarism checkers even working MikeMirzayanov ? These cheaters are :

All 3 of them submitted the same code for D2B :

WhyCheat

    #include <bits/stdc++.h>
     
    #define ll long long int
    #define pb push_back
    #define mp make_pair
    #define vll vector<ll>
    #define f(i, x, y) for (int i = x; i < y; i++)
    #define s(x) sort(x.begin(), x.end())
    #define all(v) v.begin(), v.end()
    #define pll pair<ll, ll>
    #define ff first
    #define ss second
    #define endl "\n"
     
    using namespace std;
    void solve()
    {
     
        int n, k, x;
        cin >> n >> k;
        set<int> s;
     
        for (int i = 0; i < n; i++)
        {
            cin >> x;
            s.insert(x);
        }
     
        if (k == 0)
        {
            cout << n << endl;
            return;
        }
     
        int flag = 0;
        int min = 0;
        for (auto itr = s.begin(); itr != s.end(); itr++)
        {
            if (*itr!=min)
            {
                flag = 1;
                break;
            }
            min++;
        }
     
        if (flag == 0)
        {
            cout << n + k << endl;
            return;
        }
     
        if (s.find(ceil((double)(min + *(--s.end())) / (double)2)) != s.end())
        {
            cout << n << endl;
            return;
        }
        else
        {
            cout << n + 1 << endl;
            return;
        }
     
        return;
    }
     
    int main()
    {
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout.tie(NULL);
     
        int t;
        cin >> t;
        // t = 1;
        while (t > 0)
        {
            solve();
            t--;
        }
    }

Not only this but also they cheated in the previous rounds by submitting the same code without even changing a single line,variable,indentation and template and still didnt get caught. What is going on ? MikeMirzayanov we all know that this is a great platform you have created. Recently there has been a spike in such malpractices so please do the needful.

Comments (1)

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anotherTry

4 years ago, # |

+16

It's really demotivating when you work hard to improve and people make progress without any effort. I hope the CF HQ deal with these cheats as harshly as possible. At the end of the day, they are cheating themselves, because a high rating without skills is useless. But they are also dragging down other users who are trying to get a higher rating in an honest way

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