Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
WOSS Dual Olympiad 2022 Team Round P3: Bobby and the Sidewalk Seasonal 10p 29.0% 42
WOSS Dual Olympiad 2022 Team Round P2: Bobby's Studying Schedule Seasonal 5 58.5% 48
WOSS Dual Olympiad 2022 S2: Festive Card Game Seasonal 7p 19.8% 62
WOSS Dual Olympiad 2022 J4: Fire on Christmas Day Seasonal 7p 13.7% 34
EGOI '21 P1 - Zeros EGOI 7p 20.8% 72
NOIP '07 P1 - Counting Numbers China NOI 3p 46.6% 58
NOIP '07 P2 - Expanding Strings China NOI 5p 13.2% 20
NOIP '07 P3 - Removing Numbers from Matrix China NOI 15p 20.4% 22
NOIP '07 P4 - Core of a Tree Net China NOI 17p 10.3% 2
EGOI '21 P2 - Luna Likes Love EGOI 12p 25.9% 43
NOIP '08 P1 - Silly Monkey China NOI 5p 38.4% 29
NOIP '08 P2 - Expression by Matches China NOI 10p 52.5% 25
NOIP '08 P3 - Message Passing China NOI 15p 42.9% 16
Mock CCC '23 1 S1 - Composite Fibonacci Numbers Mock CCC 5p 13.0% 148
Mock CCC '23 1 S2 - Keenan Hates Triangles Mock CCC 5p 22.9% 97
Mock CCC '23 1 S4 - Roger Says Yabe Mock CCC 15p 7.2% 19
Mock CCC '23 1 S3 - Richard The Penguin Mock CCC 10p 5.9% 27
Mock CCC '23 1 S5 - The Obligatory Data Structures Problem Mock CCC 25p 14.0% 10
Max's Anger Contest Series 1 P4 - Greedily Gamboling (Hard Version) Seasonal 15p 28.7% 13
Mock CCC '23 Contest 1 J5 - Calculus Problem Mock CCC 12p 10.1% 41
NOIP '22 P1 - Flower Planting China NOI 10p 29.0% 39
NOIP '22 P2 - Meow Meow China NOI 20p 5.1% 8
NOIP '22 P3 - Facility Construction China NOI 17p 17.6% 14
NOIP '22 P4 - Contest China NOI 25p 10.4% 7
Mock CCC '23 2 S1 - Composite Fibonacci Numbers Mock CCC 3p 23.2% 282
Mock CCC '23 2 S2 - Keenan Hates Triangles Mock CCC 7p 2.3% 38
Mock CCC '23 2 S3 - Richard The Penguin Mock CCC 10p 3.9% 13
Mock CCC '23 2 S5 - The Obligatory Data Structures Problem Mock CCC 25p 11.5% 4
Mock CCC '23 2 S4 - Roger Says Yabe Mock CCC 15p 19.0% 7
EGOI '23 P8 - Guessing Game EGOI 50p 4.0% 7
Waterloo 2023 Winter B - Laser Trap Waterloo Local 12 22.2% 13
Waterloo 2023 Winter C - Sandpile on Clique Waterloo Local 10 31.0% 13
Waterloo 2023 Winter D - Link-Cut Tree Waterloo Local 10 69.6% 14
Waterloo 2023 Winter E - Colourful Tree Waterloo Local 25 4.5% 4
Waterloo 2023 Winter A - So I'll Max Out My Constructive Algorithm Skills Waterloo Local 5 32.9% 23
Google Code Jam '22 Qualification Round Problem E - Twisty Little Passages Google Code Jam 20p 57.1% 3
Google Code Jam '08 Qualification Round Problem B - Saving the Universe Google Code Jam 5p 33.3% 4
Google Code Jam '08 Qualification Round Problem A - Fly Swatter Google Code Jam 20p 0.0% 0
Google Code Jam '08 Qualification Round Problem C - Train Timetable Google Code Jam 7p 50.0% 4
Google Code Jam '08 Round 1A Problem A - Minimum Scalar Product Google Code Jam 5p 68.4% 11
Google Code Jam '08 Round 1A Problem B - Milkshakes Google Code Jam 7p 66.7% 2
Google Code Jam '08 Round 1A Problem C - Numbers Google Code Jam 20p 22.2% 4
Google Code Jam '09 Round 1A Problem A - Multi-base happiness Google Code Jam 12p 40.0% 3
Google Code Jam '09 Round 1A Problem B - Crossing the Road Google Code Jam 15p 11.1% 1
Google Code Jam '09 Round 1A Problem C - Collecting Cards Google Code Jam 10p 60.0% 3
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 '09 Qualification Round Problem A - Alien Language Google Code Jam 5p 63.6% 5
Google Code Jam '10 Qualification Round Problem B - Snapper Chain Google Code Jam 5p 42.9% 6
Google Code Jam '10 Qualification Round Problem C - Theme Park Google Code Jam 10p 40.0% 3