hello codeforces ↵
↵
yesterday i noticed that someone from my friends solved problem D in 8 minutes.↵
↵
well this friend is known in our telegram training group to be a cheater.↵
↵
i refused that fact cuz there is no direct proof.↵
↵
while i was looking at his code i noticed that some code was copied and pasted 3 times in different functions doing nothing.↵
↵
i knew that was not normal , so i needed a proof now.↵
↵
so i decided to look at problem D solves and was suprised that so many solutions are alike in a way, but different only in variable names, and some of them were in a straight one line of code , but the same idea over and over.↵
↵
you can check some examples↵
↵
↵
[submission:308151686]↵
[submission:308117651]↵
[submission:308160744]↵
[submission:308153550]↵
[submission:308165846]↵
[submission:308152360]↵
[submission:308142455]↵
[submission:308171609]↵
[submission:308166500]↵
[submission:308167550]↵
[submission:308158553]↵
[submission:308146140]↵
[submission:308144552]↵
[submission:308158580]↵
[submission:308144531]↵
[submission:308170236]↵
[submission:308171447]↵
[submission:308138274]↵
and best for last↵
[submission:308165802]↵
↵
you can notice the large similarity between them,,↵
↵
most of them were submitted at the near end of the contest,↵
↵
these acts are not acceptable in this community, ↵
so many coders leave CP because others are cheating and he is getting negative delta over and over while not cheating.↵
↵
i would like to notice [user:MikeMirzayanov,2025-02-28] to these acts.↵
↵
update:↵
↵
the same person cheated today↵
↵
i invastigated more and found a code on a telegram group↵
↵
further more↵
↵
here is his submission↵
[submission:308347774]↵
↵
here is the code on the telegram group↵
↵
```cpp↵
↵
D1?#include <bits/stdc++.h>↵
using namespace std;↵
↵
int f(long long m, long long n, int B, const vector<int>& p) {↵
if (m <= n) return p[(int)m];↵
return (m & 1LL) ? B : B ^ f(m / 2, n, B, p);↵
}↵
↵
int main() {↵
ios::sync_with_stdio(false);↵
cin.tie(nullptr);↵
↵
int t;↵
cin >> t;↵
↵
while (t--) {↵
long long l, r;↵
int n;↵
cin >> n >> l >> r;↵
↵
vector<int> a(n + 1);↵
for (int i = 1; i <= n; i++) {↵
cin >> a[i];↵
}↵
↵
if (l <= n) {↵
cout << a[(int)l] << "\n";↵
continue;↵
}↵
↵
vector<int> p(n + 1);↵
p[0] = 0;↵
for (int i = 1; i <= n; i++) {↵
p[i] = p[i - 1] ^ a[i];↵
}↵
↵
int fn = p[n];↵
int B = (n & 1) ? fn : fn ^ p[n / 2];↵
long long m = l / 2;↵
↵
cout << f(m, n, B, p) << "\n";↵
}↵
↵
return 0;↵
}↵
↵
```↵
↵
you don't need to be smart to know whats happening , these codes are being distributed through youtube and telegram channels, too bad we can't stop them , but at least cheaters don't deserve to get to expert by cheating and get away with it.↵
↵
note: i will share the same codes that were shared for B C↵
↵
i don't care about A↵
if you cheat A just get a life man.↵
↵
↵
yesterday i noticed that someone from my friends solved problem D in 8 minutes.↵
↵
well this friend is known in our telegram training group to be a cheater.↵
↵
i refused that fact cuz there is no direct proof.↵
↵
while i was looking at his code i noticed that some code was copied and pasted 3 times in different functions doing nothing.↵
↵
i knew that was not normal , so i needed a proof now.↵
↵
so i decided to look at problem D solves and was suprised that so many solutions are alike in a way, but different only in variable names, and some of them were in a straight one line of code , but the same idea over and over.↵
↵
you can check some examples↵
↵
↵
[submission:308151686]↵
[submission:308117651]↵
[submission:308160744]↵
[submission:308153550]↵
[submission:308165846]↵
[submission:308152360]↵
[submission:308142455]↵
[submission:308171609]↵
[submission:308166500]↵
[submission:308167550]↵
[submission:308158553]↵
[submission:308146140]↵
[submission:308144552]↵
[submission:308158580]↵
[submission:308144531]↵
[submission:308170236]↵
[submission:308171447]↵
[submission:308138274]↵
and best for last↵
[submission:308165802]↵
↵
you can notice the large similarity between them,,↵
↵
most of them were submitted at the near end of the contest,↵
↵
these acts are not acceptable in this community, ↵
so many coders leave CP because others are cheating and he is getting negative delta over and over while not cheating.↵
↵
i would like to notice [user:MikeMirzayanov,2025-02-28] to these acts.↵
↵
update:↵
↵
the same person cheated today↵
↵
i invastigated more and found a code on a telegram group↵
↵
further more↵
↵
here is his submission↵
[submission:308347774]↵
↵
here is the code on the telegram group↵
↵
```cpp↵
↵
D1?#include <bits/stdc++.h>↵
using namespace std;↵
↵
int f(long long m, long long n, int B, const vector<int>& p) {↵
if (m <= n) return p[(int)m];↵
return (m & 1LL) ? B : B ^ f(m / 2, n, B, p);↵
}↵
↵
int main() {↵
ios::sync_with_stdio(false);↵
cin.tie(nullptr);↵
↵
int t;↵
cin >> t;↵
↵
while (t--) {↵
long long l, r;↵
int n;↵
cin >> n >> l >> r;↵
↵
vector<int> a(n + 1);↵
for (int i = 1; i <= n; i++) {↵
cin >> a[i];↵
}↵
↵
if (l <= n) {↵
cout << a[(int)l] << "\n";↵
continue;↵
}↵
↵
vector<int> p(n + 1);↵
p[0] = 0;↵
for (int i = 1; i <= n; i++) {↵
p[i] = p[i - 1] ^ a[i];↵
}↵
↵
int fn = p[n];↵
int B = (n & 1) ? fn : fn ^ p[n / 2];↵
long long m = l / 2;↵
↵
cout << f(m, n, B, p) << "\n";↵
}↵
↵
return 0;↵
}↵
↵
```↵
↵
you don't need to be smart to know whats happening , these codes are being distributed through youtube and telegram channels, too bad we can't stop them , but at least cheaters don't deserve to get to expert by cheating and get away with it.↵
↵
note: i will share the same codes that were shared for B C↵
↵
i don't care about A↵
if you cheat A just get a life man.↵
↵
