Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	26347
FIBD	Mortal Fibonacci Rabbits	10991
MRNA	Inferring mRNA from Protein	8457
ORF	Open Reading Frames	6489
PERM	Enumerating Gene Orders	11319
PMCH	Perfect Matchings and RNA Secondary Structures	3052
PPER	Partial Permutations	4165
SIGN	Enumerating Oriented Gene Orderings	4067
CAT	Catalan Numbers and RNA Secondary Structures	1244
INOD	Counting Phylogenetic Ancestors	2633
MMCH	Maximum Matchings and RNA Secondary Structures	1491
REAR	Reversal Distance	1010
SSET	Counting Subsets	2424
ASPC	Introduction to Alternative Splicing	1553
MOTZ	Motzkin Numbers and RNA Secondary Structures	774
SORT	Sorting by Reversals	760
RNAS	Wobble Bonding and RNA Secondary Structures	532
CTEA	Counting Optimal Alignments	382
CUNR	Counting Unrooted Binary Trees	335
CNTQ	Counting Quartets	199
EUBT	Enumerating Unrooted Binary Trees	180
ROOT	Counting Rooted Binary Trees	277