Codeforces Round 256 (Div. 2), Codeforces Round 257 (Div. 1) and Codeforces Round 257 (Div. 2) brief round statistics :

#256 (Div. 2)

First accepted:

A (00:02) Bubbler Misaka_916852 Shark TAT ZuoWeiYiGeZhangZhe Aeon himanshujaju iSlava mirceadino rureggaeton sea5
B (00:09) Aeon felix
C (00:12) wwt10086
D (00:06) sillyhook03
E (00:40) sillyhook03

Total hack attempts: +53:-137

Top-8 hackers:

350 yash.15296 +4:-1
300 TAT +3:-0
250 chenrui9551 +3:-1
200 himanshujaju +2:-0
200 Empress +2:-0
200 iSlava +2:-0
200 Alexey.Kovrizhnykh +2:-0
200 alan_navarro +2:-0

#257 (Div. 1)

First accepted:

A (00:05) BSBandme
B (00:13) semiexp
C (00:22) Um_nik
D (00:12) kcm1700
E (01:23) jcvb

Total hack attempts: +145:-131

Top-7 hackers:

700 Salvare000 +7:-0
550 zeosutt +6:-1
450 kmjp +5:-1
450 darkshadows +5:-1
400 Touma-Kazusa +5:-2
400 dreamoon_love_AA +4:-0
400 Nikitosh +4:-0

#257 (Div. 2)

First accepted:

A (00:02) Bubbler AU.Bahosain AllCatsAreBeautiful NTaveras QProgS bboy_drain anthonyhkf isego
B (00:06) Bubbler veryverydarkgray
C (00:15) Bubbler
D (00:48) yejinru13
E (01:27) dirtyword

Total hack attempts: +460:-277

Top-5 hackers:

1050 himan +11:-1
1000 Guliash +10:-0
1000 orzwzc1995 +10:-0
950 DgenerationX +10:-1
900 WTL +10:-2