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Problem Category Points AC % ▾ Users
IOI '17 P5 - Simurgh IOI 40p 12.1% 16
CCO Preparation Test 1 P1 - Double Cross Mock CCO 20p 12.1% 10
An Animal Contest 5 P2 (Hard Version) - Permutations & Primes AAC 10 12.1% 51
WC '97 P2 - Power of Cryptography Woburn Challenge 20 12.1% 12
CCO '21 P2 - Weird Numeral System CCO 17p 12.1% 87
Back From Summer '17 P6: Crowded Cities Seasonal 20p 12.1% 122
NOI '07 P2 - Cash Exchange China NOI 30p 12.1% 24
GlobeX Cup '18 S5 - Math Bash Uncategorized 17 12.1% 19
CCO Preparation Test 1 P2 - Escape Maze Mock CCO 20p 12.0% 39
DMOPC '19 Contest 2 P6 - Two Roots DMOPC 20p 12.0% 23
DMOPC '14 Contest 5 P4 - Kittan's Dilemma DMOPC 10p 12.0% 119
HHPC1 P4 - Yet Another A+B Problem Uncategorized 10p 12.0% 107
DMOPC '16 Contest 2 P6 - Console Simulator 2017 DMOPC 12p 12.0% 26
COCI '19 Contest 2 #4 Popcount COCI 20p 12.0% 3
COI '13 #3 Mostovi COCI 30p 12.0% 8
OCC '19 B5 - Gold Olympiads School 7 12.0% 20
IOI '18 P6 - Meetings IOI 35p 12.0% 10
STNBD P5 - Fianna Ray Ordesia Uncategorized 10p 12.0% 26
Mighty Cactus Uncategorized 7 12.0% 49
COI '07 #4 Umnožak COCI 25p 11.9% 44
DMOPC '21 Contest 3 P2 - Weak Data DMOPC 10p 11.9% 160
Another Contest 6 Problem 16 - Boolean (Hard) ACC 0p 11.9% 71
COCI '17 Contest 3 #3 Retro COCI 12p 11.9% 7
DMOPC '15 Contest 2 P5 - Sysadmin DMOPC 15p 11.9% 68
List Minimum (Easy) Uncategorized 3p 11.9% 850
STNBD P6 - Terminus Est Uncategorized 35p 11.9% 54
WC '07 P4 - Drain Game Woburn Challenge 15p 11.9% 9
COCI '13 Contest 4 #5 Čokolade COCI 15p 11.9% 5
CCC '97 S4 - Dynamic Dictionary Coding CCC 5 11.8% 221
Mock CCC '20 Contest 2 S4 - Rotational Arrays Mock CCC 10p 11.8% 61
NOI '21 P5 - The Locked Box China NOI 25p 11.8% 9
IOI '16 P1 - Detecting Molecules IOI 12p 11.8% 155
DMOPC '20 Contest 6 P5 - Jennifer's Math Mystery DMOPC 17p 11.8% 24
CEOI '19 P2 - Dynamic Diameter CEOI 25p 11.8% 37
GFSSOC '17 J4 - Top Courses GFSSOC 7 11.8% 45
IOI '11 P1 - Tropical Garden (Standard I/O) IOI 25p 11.8% 166
LKP '18 Contest 1 P5 - The Treaty of Wellacotia Uncategorized 17p 11.8% 51
COCI '13 Contest 1 #6 Slastičar COCI 20p 11.8% 4
IOI '09 P7 - Regions IOI 20p 11.8% 54
CCO '97 P4 - High Tide CCO 10 11.8% 3
ICPC PACNW 2010 I - Zombie Fences 2: Electric Boogaloo ICPC 35p 11.8% 2
IOI '20 P3 - Carnival Tickets IOI 20p 11.8% 37
Wesley's Anger Contest 1 Problem 1 - Simply a Simple Simplex Problem WAC 5p 11.8% 174
APIO '15 P3 - Palembang Bridges APIO 20p 11.7% 66
Topium Uncategorized 17p 11.7% 14
IOI '18 P5 - Highway Tolls IOI 30p 11.7% 14
Baltic OI '19 P5 - Necklace Baltic OI 17p 11.7% 19
Riolku's Mock CCC S3 - Mosey's Birthday Mock CCC 12p 11.7% 63
COCI '06 Contest 5 #6 Dvaput COCI 15p 11.7% 157
WC '18 Contest 1 S3 - Reach for the Top Woburn Challenge 12p 11.7% 118