Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▴ Users
Mock CCO '18 Contest 4 Problem 2 - Sunken Colonies Mock CCO 15p 43.5% 38
Mock CCO '18 Contest 4 Problem 3 - Counterattack Mock CCO 15p 23.6% 280
Mock CCO '18 Contest 4 Problem 4 - Time Travel Mock CCO 15p 27.8% 56
Mock CCO '18 Contest 4 Problem 5 - Spawn More Overlords Mock CCO 20p 24.8% 35
Mock CCO '18 Contest 4 Problem 6 - Splitting Drones Mock CCO 15p 34.6% 37
Dynamic Tree Test Data Structure Tests 45 30.0% 32
ECOO '18 R3 P1 - Balanced ECOO 12p 28.1% 12
ECOO '18 R3 P2 - Vegenère ECOO 12p 8.5% 6
ECOO '18 R3 P3 - Currency Exchange ECOO 10p 8.1% 13
ECOO '18 R3 P4 - Circular Cities ECOO 15p 16.7% 6
ECOO '18 R2 P3 - Factorial ECOO 12p 16.9% 48
ECOO '18 R2 P2 - Homework ECOO 10p 21.6% 95
ECOO '18 R2 P1 - Artificial Photosynthesystem ECOO 7p 39.1% 36
CCO '18 P1 - Geese vs. Hawks CCO 10p 37.9% 569
CCO '18 P2 - Wrong Answer CCO 12p 15.4% 115
CCO '18 P3 - Fun Palace CCO 30p 18.1% 76
CCO '18 P4 - Gradient Descent CCO 15p 14.5% 251
CCO '18 P5 - Boring Lectures CCO 20p 19.1% 125
CCO '18 P6 - Flop Sorting CCO 30p 17.5% 59
APIO '14 P2 - Split the Sequence APIO 25p 11.6% 141
CCO '18 P5 - Boring Lectures (Online Version) CCO 30p 7.4% 50
Overflow Uncategorized 30p 2.4% 7
APIO '11 P1 - Table Coloring APIO 25p 22.5% 97
CCC '01 S2 - Spirals (Exact Version) CCC 7 8.3% 105
Fibonacci Sequence (Harder) Uncategorized 17 19.7% 300
Longest Up-Down Subsequence POI 12p 29.6% 126
NOI '15 P2 - Software Package Manager China NOI 20p 27.6% 43
Double Doors Regional P4 - Tudor Teaches Jason How To Be Productive Uncategorized 10 13.1% 40
Double Doors Regional P3 - Tudor and the Pusheens Uncategorized 7 14.7% 368
Double Doors Regional P5 - Tudor Eats Ice Cream Cones Uncategorized 15 25.2% 36
Double Doors Regional P6 - Tudor Learns More DDR Uncategorized 17 17.7% 32
NOI '05 P2 - Maintaining a Sequence China NOI 30p 20.4% 81
Knapsack 3 Uncategorized 10p 26.3% 251
Bank Notes Uncategorized 7 17.0% 143
XOR Sum Uncategorized 10 45.2% 234
XOR Minimum Uncategorized 17p 36.2% 135
Dynamic Tree Test (Easy) Data Structure Tests 25p 34.0% 52
Triway Cup '18 Summer A - Arranged Marriage Seasonal 7 9.5% 52
Triway Cup '18 Summer B - Beautiful Water Pearl Seasonal 7 25.5% 196
Triway Cup '18 Summer D - Demon Slayer Seasonal 20 20.7% 14
Triway Cup '18 Summer E - Eyes of Void Seasonal 7 40.4% 46
Triway Cup '18 Summer F - Forget Me Not Seasonal 5 24.8% 157
Triway Cup '18 Summer G - Gu of Love Seasonal 20 28.6% 6
Triway Cup '18 Summer H - Heavy Souls Seasonal 15 29.6% 24
Back To School '18: Letter Frequency Seasonal 7p 19.0% 543
Back To School '18: Making Friends Seasonal 7p 18.1% 142
Back To School '18: Harambe Seasonal 3 23.2% 383
Back To School '18: Trucking Troubles II Seasonal 20p 29.7% 31
DMOPC '18 Contest 1 P1 - Sorting DMOPC 5p 15.0% 312
CCC '07 J4 - Anagram Checker CCC 5 37.2% 2122