adrien1018's blog

By adrien1018, history, 2 years ago, In English,

Overview

There are 1409603 rating changes in 792 rated contests (by 2018/07/14, including those mentioned in the "Something Weird" section). There are 142117 users with at least one rating change. The overall average of deltas is -6.671139.

Rating Changes Distribution

(Well, it looks like a boa constrictor eating an elephant...)

Top 20 Events: Positive Rating Change

# Who Δ Rating Contest
1 Mhammad1 +803 -22781 Codeforces Round #418 (Div. 2)
2 white_1 +756 5221278 Educational Codeforces Round 35 (рейтинговый для Див. 2)
3 Peregrine_Falcon +670 -12658 Codeforces Round #496 (Div. 3)
4 worse +644 230874 Codeforces Round #372 (Div. 2)
5 alagneB_diK +638 6371275 Codeforces Round #490 (Div. 3)
6 .o. +548 8721420 8VC Venture Cup 2016 - Final Round (Div. 2 Edition)
7 rakhashov.maksat +535 10881623 Codeforces Round #332 (Div. 2)
8 NelsonMondialu +526 310836 Educational Codeforces Round 35 (рейтинговый для Див. 2)
9 my_new_handle +519 8781397 Codeforces Round #451 (Div. 2)
10 Spongebob_kz +474 238712 Codeforces Round #411 (Div. 2)
11 the_myth_1996 +460 10261486 Codeforces Round #490 (Div. 3)
12 S1mplest_gu1 +456 9851441 Codeforces Round #486 (Div. 3)
13 cokamu +452 449901 Codeforces Round #482 (Div. 2)
14 CommonAnts +448 13761824 Codeforces Round #404 (Div. 2)
15 angoor +446 8891335 Codeforces Round #368 (Div. 2)
16 mrloser +444 13551799 Good Bye 2014
17 spec4r +440 13151755 Codeforces Round #461 (Div. 2)
17 Helli.code +440 11101550 Codeforces Round #447 (Div. 2)
19 koamy +439 11631602 Codeforces Round #355 (Div. 2)
20 KellyL +434 13741808 Tinkoff Internship Warmup Round 2018 и Codeforces Round #475 (Div. 2)

Top 20 Events: Negative Rating Change

# Who Δ Rating Contest
1 yosupo -336 27092373 Divide by Zero 2017 and Codeforces Round #399 (Div. 1 + Div. 2, combined)
2 j_______________________ -296 29992703 Canada Cup 2016
3 tourist -290 34963206 Codeforces Round #470 (рейтинговый, Div. 1, по задачам VK Cup 2018 Раунд 1)
4 snuke -284 26952411 Manthan, Codefest 17
5 yosupo -263 31132850 Codeforces Round #431 (Div. 1)
6 King_George -255 22632008 Codecraft-18 and Codeforces Round #458 (Div. 1 + Div. 2, combined)
7 PavelKunyavskiy -253 30972844 8VC Venture Cup 2017 - Elimination Round
8 AllCatsAreBeautiful -247 22371990 Codecraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined)
9 V--o_o--V -240 32713031 ICM Technex 2017 and Codeforces Round #400 (Div. 1 + Div. 2, combined)
10 Reyna -239 24902251 Codeforces Round #397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined)
10 I_love_Tanya_Romanova -239 29652726 Manthan, Codefest 17
12 Temirulan -238 24452207 8VC Venture Cup 2017 - Elimination Round
12 Egor -238 29352697 Codeforces Round #485 (Div. 1)
14 fukirk -235 14971262 Codeforces Beta Round #60
15 vagnard -233 22942061 КРОК 2016 - Отборочный Раунд (рейтинговая неофиц. редакция)
15 k__mas -233 21991966 Playrix Codescapes Cup (Codeforces Round #413, рейтинговый, Div. 1 + Div. 2)
17 enot110 -232 28802648 Codeforces Round #349 (Div. 1)
18 Fahim_Zubayer -231 14821251 Codeforces Beta Round #60
18 King_George -231 24492218 Codeforces Round #397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined)
18 eds467 -231 28242593 Codeforces Round #477 (рейтинговый, Div. 1, по задачам VK Cup 2018 Раунд 3)

Top 10 Users: Consecutive Positive Rating Changes

# Who # consecutive
1 tourist 21
2 stormtrooper1859 15
3 RAD 14
4 xyz111 14
5 guoyu1098 13
6 KK_ndv 13
7 The_Unbeatable 13
8 Saiphani724 12
9 harshit_ag456 12
10 vepifanov 12
10 Matei.Chirita 12

Top 10 Users: Consecutive Negative Rating Changes

# Who # consecutive
1 worse 31
2 Mhammad1 25
3 ahmed_25 22
4 newbie314159 21
5 NelsonMondialu 19
6 .o. 18
7 Peregrine_Falcon 18
8 Adai_is 17
9 THton 17
10 MisterMax 16

Top 10 Contests: Positive Averaged Rating Change

# Contest Avg. Δ # participants
1 Manthan 2011 34.309 745
2 Codeforces Beta Round #88 21.053 1103
3 Codeforces Beta Round #81 20.353 1034
4 Codeforces Beta Round #87 (Div. 1 Only) 16.067 416
5 Codeforces Beta Round #91 (Div. 1 Only) 15.448 420
6 Codeforces Beta Round #92 (Div. 1 Only) 15.140 365
7 Codeforces Beta Round #85 (Div. 1 Only) 14.957 398
8 Codeforces Beta Round #83 (Div. 1 Only) 14.909 351
9 Codeforces Beta Round #86 (Div. 1 Only) 14.389 355
10 Командная олимпиада школьников, Саратов, 2011 14.331 580

Top 10 Contests: Negative Averaged Rating Change

# Contest Avg. Δ # participants
1 VK Cup 2012 Раунд 3 (неофициальная редакция для Div. 2) -31.142 643
2 VK Cup 2012 Раунд 2 (неофициальная редакция для Div. 2) -28.747 707
3 Чемпионат КРОК 2012 - Раунд 2 (неофиц. редакция для Div. 2) -27.681 627
4 Codeforces Round #112 (Div. 2) -27.462 1518
5 Codeforces Round #113 (Div. 2) -26.989 1443
6 Codeforces Round #324 (Div. 2) -20.562 4333
7 Чемпионат КРОК 2012 - Раунд 2 -20.151 338
8 Codeforces Round #114 (Div. 2) -19.963 1395
9 Codeforces Round #326 (Div. 2) -18.719 3838
10 Codeforces Round #323 (Div. 2) -18.305 4728

Rating: Sum, Average, Standard Deviation and Skewness

A user is included in the sum only after their first participation in a contest.
Note that we can observe changes of rating system (November 2011 and October 2015) on the graph.

(I wondered if there were changes in March 2012, since the top 5 contests with most negative average delta are all in March or April 2012. However, I didn't find any related posts.)

Something Weird

  1. In Codeforces Round #FF (Div. 2), kasim appeared in both #1095 and #1986.
  2. In Codeforces Round #270, yuki2006 appeared in both #2876 and #3520; a00920 appeared in both #1097 and #3602.
  3. In Codeforces Round #338 (Div. 2), bohuss appeared in both #256 and #3477; InnocentFool appeared in both #555 and #3477; elgris appeared in both #884 and #3477; Altitude appeared in both #2439 and #3477; mohamedazab appeared in both #2831 and #3477. (Such a buggy round?)
  4. In MemSQL Start[c]UP 2.0 - Round 2, FreezingCool had a rating change of +5, but it wasn't displayed on the user page. (Can somebody explain why max rating is smaller than contest rating?)
  5. In Технокубок 2018 - Отборочный Раунд 4, ilya140101 had a rating change of -83. However, it seems that the rating is not actually changed. After that, his ratings displayed on "contest rating" and "rating change" in contest pages was 83 higher than those on the user history graph.
  6. In contest pages, ratings less than 100 are displayed as 100. 8 users have been affected: worse, MisterMax, newbie314159, errorerror, Mhammad1, KHOKHO_IS_N00B, Peregrine_Falcon and NIKABB_IS_N00B_LIKE_ME.
  7. https://codeforces.com/contests/1004 (Codeforces Round #495 (Div. 2)) is redirected to https://codeforces.com/contests/1002 (Microsoft Q# Coding Contest - Summer 2018).

Read more »

 
 
 
 
  • Vote: I like it
  • +281
  • Vote: I do not like it