Brief stats about some past contest — Codeforces Round 280 (Div. 2).
Previous posts can be found here.
Stats
| Problem | Successful hacks | Unsuccessful hacks | Other | Sum | Solutions which can be hacked | Accepted solutions | All solutions on final tests |
|---|---|---|---|---|---|---|---|
| 492A - Vanya and Cubes | 7 (17.95%) | 28 (71.79%) | 4 (10.26%) | 39 | 104 (3.94%) | 2538 (96.06%) | 2642 |
| 492B - Vanya and Lanterns | 11 (25.00%) | 26 (59.09%) | 7 (15.91%) | 44 | 120 (5.90%) | 1915 (94.10%) | 2035 |
| 492C - Vanya and Exams | 149 (48.85%) | 54 (17.70%) | 102 (33.44%) | 305 | 340 (21.55%) | 1238 (78.45%) | 1578 |
| 492D - Vanya and Computer Game | 7 (22.58%) | 18 (58.06%) | 6 (19.35%) | 31 | 138 (23.47%) | 450 (76.53%) | 588 |
| 492E - Vanya and Field | 0 (0.00%) | 1 (100.00%) | 0 (0.00%) | 1 | 5 (2.81%) | 173 (97.19%) | 178 |
Hacks and possible hacks describtion
492A - Vanya and Cubes
The test #9 was quite problematic (it was 3 with answer 1). The problems were mostly in implementation.
492B - Vanya and Lanterns
492C - Vanya and Exams
Above half of all hacks were only the maximum test which resulted in exceeding of the time limit.
492D - Vanya and Computer Game
492E - Vanya and Field
Fastest hackers
| Problem | Time | Hacker | Defender | Hack |
|---|---|---|---|---|
| 492A - Vanya and Cubes | 00:50:22 | dwoolley3 | AlgoProga | 126308 |
| 492B - Vanya and Lanterns | 00:52:56 | ztxz16 | bssanches | 126316 |
| 492C - Vanya and Exams | 00:23:53 | Endagorion | DarthHayate | 126283 |
| 492D - Vanya and Computer Game | 00:49:25 | dreamoon_love_AA | 6eJIa9IzZzTeHb | 126306 |
Best hackers
| Hacker | Stats | Successful hacks | Unsuccessful hacks |
|---|---|---|---|
| AGrigorii | +9-1 (850) | C: 126466 126473 126481 126485 126490 126496 126539 126544 126614 | C: 126554 |
| Phoenix_yu | +8-1 (750) | C: 126290 126293 126319 126351 126354 126360 126533 126618 | C: 126342 |
| shank_punk | +6-1 (550) | C: 126339 126398 126405 126422 126431 126503 | C: 126333 |
| Allanur | +6-1 (550) | C: 126427 126548 126599 126607 126640 126675 | C: 126575 |
| tourist | +5-0 (500) | C: 126310 126312 126353 126376 D: 126468 | |
| alex_y | +5-0 (500) | C: 126579 126597 126600 126605 126611 | |
| dreamoon_love_AA | +5-1 (450) | B: 126440 C: 126294 126295 D: 126306 126338 | B: 126552 |
| prana | +4-0 (400) | C: 126470 126498 126521 126538 | |
| shardex | +4-0 (400) | C: 126421 126433 126437 126515 |
Best rooms
| Room | #hacks | Hackers |
|---|---|---|
| 79 | 9 | AGrigorii [9] |
| 1 | 8 | Phoenix_yu [8] |
| 29 | 6 | shank_punk [6] |
| 84 | 6 | Allanur [6] |
| 49 | 5 | shardex [4], PieceOfCode [1] |
| 55 | 5 | alex_y [5] |
| 66 | 5 | e19-un [3], ddt [1], Godely [1] |
| 77 | 5 | bktl4ever [3], mohamednabil00000 [1], Serega_Shoigu [1] |
| 1011 | 5 | dreamoon_love_AA [5] |
| 1014 | 5 | tourist [5] |
Best countries
| Country | #hacks | Hackers |
|---|---|---|
 Russia | 24 | AGrigorii [9], Koblyk [3], Neon [2], savinov [2], azukun [2], GoDDoS [1], Kirito.LVL99 [1], Loremon [1], TonySnark [1], Endagorion [1], DimaWoogy [1] |
 India | 14 | shank_punk [6], theboyinatux [2], Dr.I_m_possible [2], ddt [1], m17 [1], bitchplz [1], pk. [1] |
 Egypt | 11 | Khairy [4], ahmedameen [2], Guts [2], mohamednabil00000 [1], khaledA [1], Killever [1] |
 Belarus | 11 | tourist [5], aandrukhovich [2], teleport [2], kefaa [1], Arthur [1] |
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