Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
IOI '04 P2 - Hermes (Hard) IOI 20p 8.1% 9
An Animal Contest 1 P2 - Alpaca Racing AAC 5p 8.1% 549
ECOO '18 R3 P3 - Currency Exchange ECOO 10p 8.1% 13
Least Multiple Olympiads School 10p 8.1% 32
IOI '22 P1 - Catfish Farm IOI 25p 8.1% 44
IOI '21 P5 - Dungeons Game IOI 30p 8.1% 9
Mock CCC '24 Contest 1 J5 - Mathland Mock CCC 10p 8.1% 34
Baltic OI '05 P6 - Polygon Baltic OI 20 8.0% 7
DMOPC '22 Contest 3 P6 - Compressibility DMOPC 25p 8.0% 19
CCC '05 J1 - The Cell Sell CCC 3 8.0% 1454
SGS Programming Challenge P4 - Toy in Psychology Class Uncategorized 17p 8.0% 14
Special Relativity Uncategorized 10p 8.0% 25
RGPC '18 P5 - Wormhole Uncategorized 20p 8.0% 7
LKP '18 Contest 2 P6 - Reconstruction Uncategorized 25 7.9% 31
Next Prime (Hard) Classics 15 7.9% 159
COCI '10 Contest 1 #4 Ljutnja COCI 12p 7.9% 25
Mock CCC '20 S4 - Valentine's Day Shopping Mock CCC 20p 7.9% 15
NOI '08 P2 - Course Design China NOI 30p 7.9% 12
NOI '13 P6 - Fast Food Restaurant China NOI 30p 7.9% 11
Yet Another Contest 2 P3 - Maximum Damage YAC 10p 7.9% 62
Mock CCC '22 2 S3 - Kaguya Wants to Analyze the Academy Anthem Mock CCC 12p 7.9% 40
An Animal Contest 3 P7 - Monkey Lasers AAC 25p 7.8% 14
WC '18 Contest 3 S3 - Counterpicking Woburn Challenge 15p 7.8% 13
CCO '01 P4 - Breaking Level (Standard I/O) CCO 12 7.8% 37
TLE '17 Contest 2 P5 - Crew Selection Test TLE 25p 7.8% 10
DMOPC '22 Contest 5 P4 - Ricochet DMOPC 17p 7.8% 22
WC '17 Contest 3 S4 - Relevant Results Woburn Challenge 20p 7.8% 5
DMOPC '22 Contest 1 P6 - Linear Swap DMOPC 30p 7.8% 9
NOI '16 P1 - Good Partitions China NOI 20p 7.8% 5
CCC '11 S4 - Blood Distribution CCC 15p 7.8% 158
APIO '23 P2 - Sequence APIO 25p 7.8% 17
CCO '11 P5 - Fixing Disks CCO 40p 7.7% 6
CCC '03 S4 - Substrings CCC 15p 7.7% 371
Yet Another Contest 7 P6 - Arithmetic Sequence Data Structure YAC 25p 7.7% 8
CCC '19 S4 - Tourism CCC 20p 7.7% 249
CCO '00 P2 - Ransom Note CCO 12p 7.7% 6
Wesley's Anger Contest 5 Problem 6 - Squirrel Cities 2 WAC 30p 7.7% 7
COCI '12 Contest 6 #6 Bakterije COCI 15 7.7% 3
COI '13 #1 CSS COCI 20p 7.7% 8
COCI '21 Contest 6 #5 Superozicija COCI 25p 7.7% 8
Wesley's Anger Contest 1 Problem 7 - Arithmetic Subtrees WAC 30p 7.7% 8
APIO '15 P2 - Jakarta Skyscrapers APIO 20p 7.7% 106
SMAC 08/09 (Nov) #2 - Stock Market II Uncategorized 10p 7.6% 19
Wesley's Anger Contest 5 Problem 5 - A Squirrel's Life WAC 25p 7.6% 12
CCO '23 P5 - Travelling Trader CCO 30p 7.6% 17
NOI '20 P4 - Dish China NOI 20p 7.6% 20
COCI '07 Contest 5 #6 Baza COCI 25 7.6% 61
IOI '15 P4 - Horses (Standard I/O) IOI 15p 7.6% 162
DMPG '19 G1 - Camera Calibration Challenge DMOPC 12p 7.5% 20
Mock CCC '19 Contest 2 J5 - Tudor Drinks Even More Tea Mock CCC 10p 7.5% 36