Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points ▴ AC % Users
IOI '10 P5 - Memory IOI 5p 23.0% 136
IOI '10 P1 - Cluedo IOI 5p 36.0% 137
IOI '94 P1 - The Triangle IOI 7p 56.5% 1484
IOI '09 P5 - Garage IOI 7 46.4% 532
IOI '09 P3 - POI IOI 7 28.7% 528
IOI '14 Practice Task 2 - Station IOI 7p 57.9% 50
IOI '06 P1 - Deciphering the Mayan Writing IOI 7p 39.5% 433
IOI '13 P4 - Cave IOI 10p 18.6% 311
IOI '98 P1 - Contact IOI 10p 8.9% 58
IOI '00 P1 - Palindrome IOI 10p 18.5% 830
IOI '09 P4 - Raisins IOI 10p 55.4% 543
IOI '10 P6 - Traffic Congestion IOI 10p 18.2% 94
IOI '94 P2 - The Castle IOI 10 18.8% 127
IOI '94 P4 - The Clocks IOI 10 27.2% 121
IOI '96 P4 - Sorting a Three-Valued Sequence IOI 10 31.9% 142
IOI '96 P1 - A Game IOI 10 39.2% 270
IOI '99 P1 - Little Shop of Flowers IOI 10 30.6% 206
IOI '04 P4 - Phidias IOI 10p 53.6% 890
IOI '14 Practice Task 3 - Tile IOI 10p 28.0% 55
IOI '14 Practice Task 1 - Square IOI 10p 51.2% 182
IOI '10 P6 - Traffic Congestion (Standard I/O) IOI 10p 33.0% 416
IOI '16 P1 - Detecting Molecules IOI 12p 11.8% 155
IOI '01 P2 - Ioiwari Game IOI 12p 34.5% 7
IOI '07 P1 - Aliens IOI 12p 15.3% 21
IOI '05 P2 - Mean Sequence IOI 12p 20.9% 271
IOI '05 P4 - Birthday IOI 12p 15.7% 141
IOI '09 P2 - Hiring IOI 12p 32.3% 252
IOI '95 Practice Task 3 - Bar Codes IOI 12p 35.4% 23
IOI '95 Practice Task 2 - Word Chains IOI 12 43.9% 54
IOI '96 P3 - Network of Schools IOI 12p 23.7% 83
IOI '96 P5 - Longest Prefix IOI 12 20.8% 112
IOI '98 P3 - Party Lamps IOI 12p 34.0% 168
IOI '00 P4 - Walls IOI 12 36.0% 229
IOI '08 P1 - Type Printer IOI 12p 20.0% 410
IOI '16 P1 - Detecting Molecules (Standard I/O) IOI 12p 14.1% 230
IOI '21 P4 - Mutating DNA IOI 12p 28.9% 75
IOI '10 P3 - Quality of Living IOI 15p 27.9% 149
IOI '15 P1 - Boxes with Souvenirs IOI 15p 13.4% 98
IOI '15 P4 - Horses IOI 15p 11.4% 102
IOI '14 P4 - Gondola IOI 15p 11.1% 99
IOI '13 P1 - Dreaming IOI 15p 22.9% 229
IOI '01 P1 - Mobile Phones IOI 15p 27.5% 704
IOI '98 P4 - Picture IOI 15p 30.9% 225
IOI '16 P4 - Paint by Numbers IOI 15p 12.4% 54
IOI '12 P3 - Crayfish Scrivener IOI 15p 31.0% 82
IOI '11 P3 - Rice Hub IOI 15p 18.2% 125
IOI '07 P4 - Miners IOI 15p 21.2% 444
IOI '18 P1 - Combo IOI 15p 15.0% 179
IOI '19 P1 - Arranging Shoes IOI 15p 16.4% 136
IOI '09 Practice Task 3 - Museum IOI 15p 48.5% 72