Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users
16 BIT S/W ONLY Uncategorized 3 36.4% 1542
2048 Uncategorized 15 12.2% 68
2-D Permutations Uncategorized 10p 25.1% 87
2-Dimensional Range Minimum Query Classics 17p 24.4% 73
2spooky4me Uncategorized 7 11.3% 152
Rotations in 3 Dimensions Fun Math 12 30.7% 88
Mispelling Uncategorized 3 11.9% 740
Mirrored Pairs Uncategorized 3 27.3% 747
A20 Gate Uncategorized 5 34.1% 167
Triple Fat Ladies Uncategorized 5 25.0% 730
Sorting Classics 5 52.5% 1833
An Animal Contest 1 P1 - Alpaca Shapes Uncategorized 3p 48.3% 387
An Animal Contest 1 P2 - Alpaca Racing Uncategorized 5p 12.8% 185
An Animal Contest 1 P3 - Happy Alpacas Uncategorized 7p 22.4% 146
An Animal Contest 1 P4 - Alpaca Arrays Uncategorized 10p 17.3% 90
An Animal Contest 1 P5 - Odd Alpacas Uncategorized 12p 25.1% 40
An Animal Contest 1 P6 - Alpaca Distancing Uncategorized 12p 27.7% 50
An Animal Contest 2 P0 - Koala Matchmaking Uncategorized 3 62.1% 339
An Animal Contest 2 P1 - Koala Konundrum Uncategorized 5 47.5% 233
An Animal Contest 2 P2 - Koala Party Uncategorized 5p 18.8% 178
An Animal Contest 2 P3 - Koala Balloons Uncategorized 12p 17.4% 109
An Animal Contest 2 P4 - Koala Gambling Uncategorized 12 18.3% 102
An Animal Contest 2 P5 - Koala Carnival Uncategorized 15p 32.6% 49
An Animal Contest 2 P6 - Koala Transport System Uncategorized 17p 21.9% 26
An Animal Contest 3 P1 - Monkey Shopping Uncategorized 3 47.8% 383
An Animal Contest 3 P2 - Monkey Potato Uncategorized 5p 21.7% 344
An Animal Contest 3 P3 - Monkey Market Uncategorized 7 22.2% 275
An Animal Contest 3 P4 - Monkey Mayhem Uncategorized 7 37.1% 179
An Animal Contest 3 P5 - Monkey Canoe Uncategorized 12p 20.2% 107
An Animal Contest 3 P6 - Monkey Station Uncategorized 17 14.0% 40
An Animal Contest 3 P7 - Monkey Lasers Uncategorized 25p 8.9% 10
An Animal Contest 3 P7 - Monkey Lasers (Up Version) Uncategorized 25p 42.9% 5
An Animal Contest 3 P8 - Monkey Retirement Uncategorized 25p 4.1% 7
Advanced Battleships Uncategorized 15p 9.4% 17
Appleby Contest '19 P1 - Darcy's Debilitating Demands Uncategorized 3p 18.3% 229
Appleby Contest '19 P2 - The Love Letter Uncategorized 5p 29.6% 303
Appleby Contest '19 P3 - A Recursion Problem Uncategorized 5p 31.7% 140
Appleby Contest '19 P4 - Rectangles Uncategorized 7p 31.7% 193
Appleby Contest '19 P5 - Matrix Operation Uncategorized 10p 31.6% 202
Appleby Contest '20 P1 - Terrific Triangles Uncategorized 3p 22.5% 342
Appleby Contest '20 P2 - Playful Playdoughs Uncategorized 5p 23.1% 263
Appleby Contest '20 P3 - Ridiculous String Uncategorized 10p 16.7% 154
Appleby Contest '20 P4 - Philosophy Class Uncategorized 12p 14.9% 71
Appleby Contest '20 P5 - Ridiculous Tree Uncategorized 15p 21.1% 50
Another Contest 1 Problem 1 - Binary String Operations Uncategorized 25 12.1% 33
Another Contest 1 Problem 2 - Graphs Uncategorized 15 6.7% 59
Another Contest 1 Problem 3 - Poutine Uncategorized 10 3.8% 43
Another Contest 2 Problem 1 - Poutine Uncategorized 15 15.2% 83
Another Contest 2 Problem 2 - Poutine Uncategorized 10 27.6% 97
Another Contest 2 Problem 3 - Poutine Uncategorized 15 28.8% 84