ID Problem Show tags Hide tags AC / Tried Difficulty
3086 OHANIBTR  Ohani And Binary Search Tree 0 / 0 (None)
3257 OHANIGAME  Ohani And The Game 0 / 0 (None)
3085 OHANISER  Ohani And The Series 0 / 0 (None)
637 OIL  Toil for Oil 0 / 0 (None)
743 OILCOMP  Oil Company 0 / 0 (None)
1702 OKRET  Okret 0 / 0 (None)
1492 OLOLO  Onotole needs your help 0 / 0 (None)
3431 OMWG  One more weird game 0 / 0 (None)
2115 ONBRIDGE  Online Bridge Searching 0 / 0 (None)
574 ONEINSTR  One Instruction Computer Simulator 0 / 0 (None)
2444 ONEXLIS  One X LIS 0 / 0 (None)
232 ONEZERO  Ones and zeros 0 / 0 (None)
3845 ONORIVER1  Ono at the river 1 0 / 0 (None)
4 ONP  Transform the Expression 0 / 0 (None)
1428 ONTIME  Just on Time 0 / 0 (None)
2810 OPBIT  Operation Bits 0 / 0 (None)
2273 OPCPIZZA  Pizzamania 0 / 0 (None)
2288 OPCTRIP  The Trip 0 / 0 (None)
3722 OPMODULO  "Operation - Modulo" 0 / 0 (None)
963 OPTCUT  Chặt cây 0 / 0 (None)
334 OPTM  Optimal Marks 0 / 0 (None)
415 OPTSUB  Optimal Connected Subset 0 / 0 (None)
165 ORDERS  Ordering the Soldiers 0 / 0 (None)
773 ORDERSET  Order statistic set 0 / 0 (None)
3422 ORDSUM23  Sums of 2 and 3 0 / 0 (None)
2768 ORGNZ  Organizator 0 / 0 (None)
386 ORIGLIFE  Origin of Life 0 / 0 (None)
817 OROSNAKE  Ouroboros Snake 0 / 0 (None)
525 ORZ  Nuclear Plants 0 / 0 (None)
1532 OSPROB1  Operating System Problems (Task Scheduling) 0 / 0 (None)
988 OTOCI  OTOCI 0 / 0 (None)
2020 OTOY1  One Theorem, One Year 0 / 0 (None)
2720 OU7  Fone Frequencies 0 / 0 (None)
3226 OVERLAP  Overlapping Words 0 / 0 (None)
3776 OVGDEL  Good Elements 0 / 0 (None)
3788 OVICUMSUM  A Cumulative Sum Problem 0 / 0 (None)
3789 OVISLARSUM  Large Sum 0 / 0 (None)
2416 OVOXO  Tic-tac-toe 3 0 / 0 (None)
1118 PA06ANT  Ant 0 / 0 (None)
1722 PAAAARTY  Party! 0 / 0 (None)
2253 PACKRECT  Packing Rectangles 0 / 0 (None)
850 PAGAIN  Prime Again 0 / 0 (None)
737 PAINTBLC  Painting Blocks (Act II) 0 / 0 (None)
736 PAINTBLK  Painting Blocks (Act I) 0 / 0 (None)
130 PAINTTMP  Paint templates 0 / 0 (None)
1803 PAINTWAL  Paint on a Wall 0 / 0 (None)
3362 PAIRDIV2  Pair Divisible 2 0 / 0 (None)
1147 PAIRGRPH  A Pair of Graphs 0 / 0 (None)
301 PAIRINT  Pairs of Integers 0 / 0 (None)
1168 PAIRSORT  Double Sorting 0 / 0 (None)
1828 PAIRSUM  Sum of Pairwise Products 0 / 0 (None)
385 PALACE  Accomodate the palace 0 / 0 (None)
907 PALDR  Even Palindrome 0 / 0 (None)
765 PALIM  Yet Another Longest Palindrome Problem 0 / 0 (None)
5 PALIN  The Next Palindrome 0 / 0 (None)
1934 PALINDNA  Palindromic DNA 0 / 0 (None)
3711 PALMKR  Palindrome Maker 0 / 0 (None)
756 PALNUM  Palindromic Number 0 / 0 (None)
3815 PALOVE  Pandas are the best Lovers 0 / 0 (None)
3360 PALPRIM  Palindromic Primes (Hard) 0 / 0 (None)
129 PALSEC  Choosing a Palindromic Sequence 0 / 0 (None)
2988 PAML  Popeye and the magical land 0 / 0 (None)
1429 PANCAKES  Delicious Pancakes 0 / 0 (None)
160 PANIC  Panic in the Plazas 0 / 0 (None)
1214 PARADOX  Paradox 0 / 0 (None)
3604 PARAG  Paragliding Trip 0 / 0 (None)
2620 PARCARD1  Partition function (EASY) 0 / 0 (None)
2621 PARCARD2  Partition function (HARD) 0 / 0 (None)
2018 PAREN  COUNT PAREN 0 / 0 (None)
845 PARITY  Parity 0 / 0 (None)
1613 PARKET1  PARKET 0 / 0 (None)
792 PARKINGL  Parking Lot 0 / 0 (None)
1949 PARSUMS  Nonnegative Partial Sums 0 / 0 (None)
115 PARTIT  Partition 0 / 0 (None)
1343 PARTPAL  Partial Palindrome 0 / 0 (None)
283 PARTPALI  Particular Palindromes 0 / 0 (None)
1597 PARTPLNE  Partitioning the plane 0 / 0 (None)
392 PARTSUM  Partial Sums 0 / 0 (None)
87 PARTY  Party Schedule 0 / 0 (None)
723 PARTY2  Party of Cloaked Killers 0 / 0 (None)
2486 PARTYTIM  Party Time 0 / 0 (None)
851 PATHEADS  Patting Heads 0 / 0 (None)
3371 PATHGAME  Path Game 0 / 0 (None)
1718 PATT  Pattern Matching 0 / 0 (None)
1208 PATULJCI  Snow White and the N dwarfs 0 / 0 (None)
3180 PAUL2  A conjecture of Paul Erdős (hard) 0 / 0 (None)
2982 PAUWS  Pair and unpair weightest string 0 / 0 (None)
108 PAYING  Paying in Byteland 0 / 0 (None)
355 PB  Parking Bay 0 / 0 (None)
2354 PBBN2  Print Big Binary Numbers 0 / 0 (None)
1239 PBCGAME  PBCGAME 0 / 0 (None)
1403 PBOARD  Blocks for kids 0 / 0 (None)
1461 PC8C  Cave Crisis 0 / 0 (None)
1462 PC8F  Optimal Strategy for the ICPC 0 / 0 (None)
1426 PC8H  Repair Depots 0 / 0 (None)
3312 PCLNMBR  Peculiar Number 0 / 0 (None)
3034 PCOPTRIP  Counting Pairwise Coprime Triples 0 / 0 (None)
2396 PCPC12D  New Strategy 0 / 0 (None)
2397 PCPC12E  Snakes and Ladders 0 / 0 (None)
2398 PCPC12F  Snakes and Ladders Again 0 / 0 (None)

Categories

Lucky

Pick a problem randomly based on the current filter.