Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users ▴
NOI '08 P6 - Tournament Matching China NOI 40p 17.8% 4
NOI '07 P6 - Thief Catching China NOI 40p 23.7% 4
IOI '05 Practice Task 3 - Polish Flag IOI 20p 10.6% 4
ICPC NEERC 2010 F - Factorial Simplification ICPC 15p 26.7% 4
MMM '14 F - Electricity Grid Uncategorized 25p 12.5% 4
WC '01 Suicidal P4 - Big Brother Woburn Challenge 15 6.6% 4
WC '98 P1 - Optical Recognition Woburn Challenge 12 22.2% 4
WC '18 Contest 4 S4 - Super Luigi Odyssey Woburn Challenge 25p 9.2% 4
Temple Construction Uncategorized 20p 14.5% 4
Baltic OI '16 P3 - Spiral Baltic OI 30p 13.3% 4
Crosswords Uncategorized 15p 16.0% 4
IOI '12 P1 - Pebbling Odometer IOI 30p 2.9% 4
ICPC SWERC 2017 K - Blowing Candles ICPC 15 10.0% 4
COCI '11 Contest 2 #5 Funkcija COCI 15p 16.7% 4
COCI '13 Contest 4 #6 Utrka COCI 20p 45.0% 4
COCI '11 Contest 4 #6 Kriptogram COCI 15p 27.3% 4
COCI '17 Contest 6 #5 Kotrljanje COCI 17p 17.9% 4
ECOO '21 P6 - Problematic Pathways ECOO 30p 9.2% 4
ICPC NWERC 2015 E - Elementary Math ICPC 15 41.2% 4
NOI '21 P6 - Robot Game China NOI 25p 22.4% 4
Baltic OI '09 P3 - Subway Signaling Error Baltic OI 12p 36.4% 4
DMOPC '21 Contest 4 P6 - Balanced Line DMOPC 35p 4.5% 4
COI '18 #3 Segway COCI 12p 40.0% 4
COI '18 #4 Tenis COCI 30p 15.4% 4
Baltic OI '08 P5 - Grid Baltic OI 17p 25.0% 4
Baltic OI '10 P2 - Lego Baltic OI 12p 53.8% 4
COCI '09 Contest 7 #6 Restoran COCI 20p 16.4% 4
COI '19 #2 Pastiri COCI 35p 3.9% 4
Baltic OI '15 P4 - File Paths Baltic OI 20p 53.3% 4
Baltic OI '15 P6 - Tug of War Baltic OI 20p 11.1% 4
Maximum Deviation Spanning Tree Olympiads School 25p 4.0% 4
Baltic OI '03 P1 - Barrel Baltic OI 10p 7.9% 4
Baltic OI '13 P3 - Pipes Baltic OI 25p 13.3% 4
Baltic OI '14 P3 - Sequence Baltic OI 30p 30.0% 4
Baltic OI '04 P2 - Scales Baltic OI 10p 44.4% 4
NOI '22 P4 - Challenge NPC China NOI 25p 30.6% 4
COCI '22 Contest 2 #5 Kruhologija COCI 30p 20.0% 4
Mock CCC '23 2 S5 - The Obligatory Data Structures Problem Mock CCC 25p 11.5% 4
Waterloo 2023 Winter E - Colourful Tree Waterloo Local 25 4.5% 4
Google Code Jam '22 Round 1C Problem A - Letter Blocks Google Code Jam 10p 23.5% 4
Google Code Jam '08 Qualification Round Problem B - Saving the Universe Google Code Jam 5p 71.4% 4
Google Code Jam '08 Qualification Round Problem C - Train Timetable Google Code Jam 7p 50.0% 4
Google Code Jam '09 Qualification Round Problem C - Welcome to Code Jam Google Code Jam 7p 19.0% 4
Google Code Jam '09 Qualification Round Problem B - Watersheds Google Code Jam 5p 33.3% 4
Google Code Jam '10 Round 1A Problem A - Rotate Google Code Jam 7 44.4% 4
Google Code Jam '11 Qualification Round Problem B - Candy Splitting Google Code Jam 7p 57.1% 4
Google Code Jam '13 Round 1A Problem A - Bullseye Google Code Jam 7p 16.7% 4
Google Code Jam '16 Round 1A Problem A - The Last Word Google Code Jam 5p 66.7% 4
Google Code Jam '17 Qualification Round Problem A - Oversized Pancake Flipper Google Code Jam 5p 40.0% 4
Google Code Jam '17 Qualification Round Problem B - Tidy Numbers Google Code Jam 5p 31.6% 4