Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points ▴ AC % Users
CCC '01 S5 - Post's Correspondence Problem CCC 10 28.9% 315
CCC '02 S4 - Bridge Crossing CCC 10p 37.2% 883
CCC '02 S5 - Follow the Bouncing Ball CCC 10 13.8% 190
CCC '98 S4 - Lottery CCC 10 9.6% 92
CCC '98 S5 - Mountain Passage CCC 10 13.0% 148
CCC '97 S5 - Long Division CCC 10 9.9% 65
CCC '00 S5 - Sheep and Coyotes CCC 10p 4.1% 176
COCI '15 Contest 1 #3 Baloni COCI 10p 29.0% 128
COCI '15 Contest 2 #3 Artur COCI 10p 9.1% 27
COCI '15 Contest 3 #3 Molekule COCI 10 52.8% 98
ICPC NAQ 2016 G - Inverse Factorial ICPC 10 17.8% 113
ICPC NAQ 2016 C - Big Truck ICPC 10 45.4% 73
ICPC NAQ 2016 H - Nine Packs ICPC 10p 22.8% 52
TLE '16 Contest 2 P3 - Fax's Thanksgiving Dinner TLE 10p 12.9% 45
COCI '16 Contest 1 #3 Cezar COCI 10p 17.9% 77
TLE '16 Contest 3 P3 - Mysterious Package TLE 10p 14.7% 33
ICPC ECNA 2016 B - Foosball Dynasty ICPC 10 19.7% 12
ICPC ECNA 2016 D - Lost in Translation ICPC 10 28.1% 112
COCI '06 Contest 1 #4 Slikar COCI 10 24.2% 579
Disclosure Uncategorized 10 23.7% 97
Quine Classics 10 35.6% 666
CCO '99 P2 - Common Words CCO 10 12.3% 315
GCC '16 P1 - Watching Anime Uncategorized 10p 15.9% 65
CCO '05 P5 - Segments CCO 10p 44.3% 284
DMOPC '16 Contest 3 P3 - Phantom Fight DMOPC 10p 14.1% 98
ICPC NAQ 2015 G - Safe Passage ICPC 10 49.7% 91
GFSSOC '17 S4 - First Ace GFSSOC 10 12.5% 36
COCI '06 Contest 5 #3 Tenis COCI 10p 18.5% 74
DMOPC '16 Contest 3 P2 - Starstruck Squeeze DMOPC 10p 8.8% 106
HCI '16 - Redstone Repeaters Uncategorized 10p 2.3% 9
HCI '16 - lvm_ex Uncategorized 10p 10.4% 6
HCI '16 - Xorpow Uncategorized 10p 23.8% 76
HCI '16 - Boxception Uncategorized 10p 53.0% 7
HCI '16 - Taxi Uncategorized 10p 24.3% 46
IOI '98 P1 - Contact IOI 10p 8.9% 58
IOI '00 P1 - Palindrome IOI 10p 18.4% 826
New Year's '17 P3 - Fibonacci Presents Seasonal 10 12.8% 81
New Year's '17 P2 - Peter's Escape Seasonal 10p 12.7% 59
MNYC '17: Hurontario Seasonal 10p 13.7% 237
ICPC ECNA 2005 B - Countdown ICPC 10 22.0% 122
ICPC ECNA 2005 H - Two Ends ICPC 10 35.1% 156
TLE '16 Contest 5 P2 - Playing Piano TLE 10p 15.6% 26
TLE '16 Contest 5 P3 - Flight Exam TLE 10p 6.9% 46
DMOPC '16 Contest 4 P3 - Carnival Phantasm DMOPC 10 19.2% 239
CCO '05 P1 - Number Matrix CCO 10 24.2% 161
Facebook Hacker Cup '17 Qualifying Round P3 - Fighting the Zombie FHC 10p 19.4% 29
ICPC ECNA 2000 F - To Bet or Not To Bet ICPC 10 29.4% 4
RGPC '17 P4 - Snow Day Uncategorized 10p 14.2% 102
TLE '16 Contest 6 (Mock CCC) S2 - Paper Stapling TLE 10p 6.0% 41
TLE '16 Contest 6 (Mock CCC) J5 - Meal Plan TLE 10p 5.1% 13