coincidence or someone is having fun with multiple alt accounts?

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Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
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Блог пользователя gholyo

coincidence or someone is having fun with multiple alt accounts?

Автор gholyo, история, 11 месяцев назад, По-английски

In today's contest, as I was searching for solutions, I stumbled upon this unique standings page. It is flooded with accounts bearing anime character names. Upon checking, I noticed that all these accounts share the same creation date, along with identical solutions and submissions, with slight variations. Note: unmark show unofficial

+127

gholyo
11 месяцев назад
29

Комментарии (29)

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ScarletS

11 месяцев назад, # |

Too many normie anime.

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Physics212303

11 месяцев назад, # |

← Rev. 2 →

+43

→ Ответить

Physics212303

11 месяцев назад, # ^ |

← Rev. 2 →

I also noticed that they all participated in the same contests. Like "Goodbye 2023".

→ Ответить

gholyo

11 месяцев назад, # ^ |

+21

They have the same graph, spot the difference lol

→ Ответить

X-OR

11 месяцев назад, # ^ |

I guess I would be getting more +ve delta hehe after plag check

→ Ответить

gholyo

11 месяцев назад, # ^ |

Yeah, for sure. There are about 39 accounts, and even an accounts we can't see, but the plagiarism check may detect it.

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jamienguyen

11 месяцев назад, # ^ |

Whom should we mention to alert them about this mass cheating?

→ Ответить

gholyo

11 месяцев назад, # ^ |

mentioned mike already

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transfermarket

10 месяцев назад, # ^ |

https://codeforces.me/blog/entry/123886

I already reported 3 weeks ago but Mike didn't do anything about it :(

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yeminghan

11 месяцев назад, # |

← Rev. 2 →

+36

All the codes begin with...

from itertools import chain, combinations, permutations
from collections import defaultdict, Counter, deque
from math import ceil, floor, gcd, inf, log2, sqrt
from bisect import bisect_right as upper_bound
from bisect import bisect_left as lower_bound
from random import choices, randint, sample
from functools import lru_cache, reduce
from heapq import heappop, heappush
from sys import stdin, stdout
from gzip import decompress
import builtins

and then some useless algorithm templates,

and a line which is the only line that solves the problem:

exec(decompress("something I can't understand"))

finally, some useless operations on a variable.

He must tried very hard to cheat. LMAO

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xcx0902

11 месяцев назад, # ^ |

← Rev. 2 →

+14

What a amazing cheat way that all the "useless templates" are different lol

This let me think a way of having high rating:

Create a base account and a lot of accounts. Use the base account to solve the problems normally. If you feel good, choose some accounts to submit the compressed solutions.

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Termii

10 месяцев назад, # ^ |

There should be a rule against obfuscating code

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Hasib.Nabid

11 месяцев назад, # |

+39

Only cowards use alt accounts

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G.J

10 месяцев назад, # ^ |

-17

As an alt, I don't agree.

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Hasib.Nabid

10 месяцев назад, # ^ |

Understandable. Cowards doesn’t agree!

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NerfThis

11 месяцев назад, # |

+28

Looks like a cheater is trying really hard to not get caught and he succeeded this time....

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gholyo

11 месяцев назад, # ^ |

it's not only this time, he participated in 4 to 6 previous contests and he passed

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xcx0902

11 месяцев назад, # ^ |

← Rev. 2 →

But as this post is sent, I think he (or they?) will be caught soon.

Maybe @omeganot and @sum (two authors) will be useful.

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gholyo

11 месяцев назад, # ^ |

+21

No clue, maybe mentioning mike will do MikeMirzayanov

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omeganot

11 месяцев назад, # ^ |

+26

unfortunately i dont think authors are able to do anything about this. I think only Mike or admins can remove these cheaters :/

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fastybanno

11 месяцев назад, # |

CPers and their connection with anime is very deep

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gholyo

11 месяцев назад, # |

+19

About 70 down votes, dude is abusing his alt accounts lol

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diffusion

10 месяцев назад, # |

what's the point of even putting in that much effort just for an ego boost?

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bugdone

10 месяцев назад, # ^ |

+22

maybe he sells boosted accounts?

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mathneko

10 месяцев назад, # |

← Rev. 3 →

Seriously, will this case just be passed over? There are 39 bots taking rank sub 500. Anyone can see these are obviously bot accounts by their submission time, account creation date, and code. Since they are so many, even now it affects the scoreboard and I wonder how many bot accounts I'll have to fight if these kinds of cases just get passed over.

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gholyo

10 месяцев назад, # ^ |

Probably it will not pass, i can't remember when was the last time they made a roll back, but i expect a roll back that clears the leaderboard tonight or after the edu tomorrow, just be patient.

→ Ответить

_rey

10 месяцев назад, # |

It's very easy to find who the culprit is, actually. By taking what is inside the exec function in their codes (the decompress("a bunch of bullshit") thing), we get the source code that got processed by some sort of program and mass submitted in the bot accounts. For example, here's the source code for D

Spoiler

import sys
from bisect import bisect_right
input = sys.stdin.readline
def solve():
    n, q = map(int, input().split())
    sz = []
    ele = []
    bda = 10**19
    prf = [-1] * (n+1)
    for i in range(n):
        a2 = list(map(int, input().split()))
        b = a2[0]
        if b == 1:
            x = a2[1]
            if not sz:
                sz.append(0)
                ele.append(x)
            else:
                sz.append(sz[-1] + 1)
                ele.append(x)
        else:
            x = a2[1]
            oh = (sz[-1] + 1) * (x + 1) - 1
            if oh >= bda:
                sz.append(bda)
                continue
            sz.append(oh)
            ele.append(ele[-1])
            prf[i] = sz[-1] + 1
    a3 = list(map(int, input().split()))
    for iii in range(q):
        num = a3[iii] - 1
        while True:
            ex = bisect_right(sz, num) - 1
            if sz[ex] == num:
                print(ele[ex], end=" ")
                break
            num = num % (sz[ex] + 1)
    print()
    
    if __name__ == "__main__":
    for _ in range(int(input())):
        solve()

Now we just gotta have a program search for this on the contest submissions and find the author of the code.

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2304

10 месяцев назад, # |

+16

MikeMirzayanov, rating had rolled back recently, however, these accounts aren't banned yet. Please do something.

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2304

6 месяцев назад, # ^ |

MikeMirzayanov, are you there?

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