AHMADUL's blog

To- "The Codeforces community"
By AHMADUL, history, 23 months ago, In English

Is it really a bug of the judges??? I have given same input for 2 different accepted codes for the following problem: https://codeforces.net/contest/1771/problem/C But, they gave me different output!

Input: 1 101 2 3 5 7 1 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499 503 509 521 523 541 4

First code: submission_id- 184778210 Output: NO.

Second code: submission_id- 185537533 Output: YES.

And the valid answer is "YES". But the judges also accepted "NO"!!!

  • Vote: I like it
  • -26
  • Vote: I do not like it

Comments Comments (2)
| Write comment?
»
23 months ago, # |
← Rev. 3   Vote: I like it 0 Vote: I do not like it

The first code was hacked

→ Reply
»
23 months ago, # |
  Vote: I like it 0 Vote: I do not like it

The first code was originally accepted because there weren't any test cases that made the submission fail. It isn't a "bug" in the judging system, but a mistake in terms of insufficient tests by authors. And that's why the code got hacked.

→ Reply