Two sussy users in global 28

#	User	Rating
1	tourist	3985
2	jiangly	3814
3	jqdai0815	3682
4	Benq	3529
5	orzdevinwang	3526
6	ksun48	3517
7	Radewoosh	3410
8	hos.lyric	3399
9	ecnerwala	3392
9	Um_nik	3392

#	User	Contrib.
1	cry	169
2	maomao90	162
2	Um_nik	162
4	atcoder_official	161
5	djm03178	158
6	-is-this-fft-	157
7	adamant	155
8	awoo	154
8	Dominater069	154
10	nor	150

The contest was good, problem D was very interesting. However, I want to expose two sussy users.

Problem C: https://codeforces.net/contest/2048/submission/297305429

This guy just change his code(may be not his code) to just 1 line, why did he need to do that??? May be he copied someone else's code and change it so system testing couldn't detect it?

Format code

results = []
for _ in range(int(input())):
    s = input()
    n = len(s)
    ok = False
    l, r = 1, 1
    for i in range(n):
        if s[i] == '0':
            ok = True
            mx = '0' * (n - i)
            for j in range(i):
                cnt = ''
                cnt += ''.join(str(int(s[i + k] != s[j + k])) for k in range(n - i))
                if cnt > mx:
                    l, r = j, j + n - i - 1
                    mx = cnt
            break
    results.append(f'1 {n} {l + 1} {r + 1}') if ok else results.append(f'1 {n} 1 1')
print('\n'.join(results))

Additionally, is another user's code for C is very similar to above code, but in another language:

Problem C: https://codeforces.net/contest/2048/submission/297300414

And there is more, their codes for D are also similar, just different language Problem D: https://codeforces.net/contest/2048/submission/297334479

Format code

from collections import deque

INF = int(1e9)
LINF = int(1e18)
t = int(input())

for _ in range(t):
    n, m = map(int, input().split())
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    v = a[0]
    a.sort()
    b.sort()
    q = deque(a)
    cnt = n
    c = [0] * (m + 1)
    
    for i in range(m):
        while q and q[0] < b[i]:
            q.popleft()
            cnt -= 1
        if q and q[0] <= v:
            c[i + 1] = 0
        else:
            c[i + 1] = cnt
    
    c.sort()
    
    for i in range(1, m + 1):
        ans = 0
        for j in range(i, m + 1, i):
            ans += c[j] + 1
        print(ans, end=' ')
    print()

Problem D: https://codeforces.net/contest/2048/submission/297331568

I still don't know if this is cheating or not, but if it is, I hope they will know their mistakes and never do it again. Cheating is unfair.

Sorry for my bad english

Comments (4)

Write comment?

faraway_06

10 hours ago, # |

hope they didn't

→ Reply

10 hours ago, # ^ |

they did

draid

7 hours ago, # |

random thought in my mind, what if we start organizing sting operations against cheaters? like making "streams" that point to an ip grabber and directly reporting that? idk

ThegodbridgeXD

81 minute(s) ago, # ^ |

May be

But they can't be banned. As you can see, they cheated very obviously, but you can't do anything to them.

ThegodbridgeXD's blog