Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
CCC '17 S2 - High Tide, Low Tide CCC 5 27.9% 2835
COCI '06 Contest 6 #3 Maraton COCI 5 27.9% 222
IOI '10 P3 - Quality of Living IOI 15p 27.9% 147
IOI '07 P6 - Training IOI 40p 27.9% 67
COCI '08 Contest 4 #3 Rot COCI 5 27.9% 35
ECOO '16 R2 P4 - Hop, Skip and Jump ECOO 12p 27.9% 18
WC '16 Contest 2 J1 - The Perfect Mate Woburn Challenge 3 27.8% 99
UACC 1 P2 - Puzzling Parks Uncategorized 5 27.8% 207
Another Contest 4 Problem 0 - The April Fools Warmup Problem ACC 0 27.8% 466
NOI '14 P4 - Zoo China NOI 15p 27.8% 77
EGOI '23 P1 - Inflation EGOI 7p 27.8% 130
CCC '11 J4 - Boring Business CCC 7 27.8% 1504
CCC '03 S3 - Floor Plan CCC 7 27.8% 1947
Triway Cup '19 Summer H - Time Traveller Imaxblue Seasonal 30 27.8% 28
COCI '16 Contest 2 #2 Tavan COCI 7p 27.8% 69
Summer Institute '17 Contest 1 P5 - Crazy Math SIUCF 15 27.8% 62
COCI '07 Contest 5 #4 Avogadro COCI 15p 27.8% 88
ICPC SWERC 2017 D - Candy Chain ICPC 15 27.8% 17
Halloween '14 P2 - Cat Girls Seasonal 12p 27.8% 205
Inaho IX Uncategorized 20p 27.8% 45
IOI '14 P3 - Game IOI 20p 27.8% 216
DMOPC '15 Contest 7 P6 - A Very Very Original Problem DMOPC 20p 27.8% 52
Valentine's Day '18 J5 & S2 - Ctudor's Cute Orchids Mock CCC 7 27.7% 159
COCI '09 Contest 1 #4 Mali COCI 10 27.7% 97
DMPG '18 B4 - Shimnanigans DMOPC 5p 27.7% 88
COCI '11 Contest 3 #5 Plaće COCI 12p 27.7% 26
Triway Cup '19 Summer A - Cave Escape Seasonal 17 27.7% 16
DMOPC '21 Contest 1 P4 - Uneven Forest DMOPC 20 27.7% 48
K-Dimensional Grids Uncategorized 15p 27.7% 21
COCI '06 Contest 6 #6 Prostor COCI 25p 27.7% 33
Mock CCO '18 Contest 2 Problem 2 - Victor Rains Mock CCO 20p 27.7% 21
WC '16 Contest 1 S2 - Alucard's Quest Woburn Challenge 10p 27.7% 66
Favorite Numbers Uncategorized 5 27.7% 119
COCI '12 Contest 6 #4 Burek COCI 12p 27.7% 16
DMPG '17 G2 - Holy Grail War DMOPC 17p 27.7% 255
TLE '16 Contest 1 P4 - Microwaves Again! TLE 12p 27.7% 66
DMPG '15 B2 - Trunk in Trunk DMOPC 5p 27.7% 212
WC '17 Contest 2 J4 - Entish Translation Woburn Challenge 7p 27.7% 40
COCI '13 Contest 1 #4 Lopov COCI 15p 27.7% 485
LKP '18 Contest 2 P3 - Non-strategic Bombing Uncategorized 7 27.6% 102
CCO '11 P1 - Putnam CCO 7 27.6% 108
DMPG '18 G6 - Class Chitchat DMOPC 20p 27.6% 85
CCC '07 S2 - Boxes CCC 5 27.6% 1209
Balkan OI '11 P3 - Medians Balkan OI 12p 27.6% 37
King Graff's Tolls Uncategorized 17p 27.6% 55
Mock CCC '20 Contest 2 S2 - 4D BBST on a DP Mock CCC 5p 27.6% 281
Mock CCO '18 Contest 4 Problem 4 - Time Travel Mock CCO 15p 27.6% 56
WC '02 P7 - Old Macdonald's Farm Woburn Challenge 10 27.5% 35
IOI '95 P2 - Shopping Offers IOI 15p 27.5% 42
An Animal Contest 1 P5 - Odd Alpacas AAC 12p 27.5% 106