Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	35546
FIBD	Mortal Fibonacci Rabbits	14411
MRNA	Inferring mRNA from Protein	11057
ORF	Open Reading Frames	8477
PERM	Enumerating Gene Orders	14280
PMCH	Perfect Matchings and RNA Secondary Structures	4129
PPER	Partial Permutations	5403
SIGN	Enumerating Oriented Gene Orderings	5063
CAT	Catalan Numbers and RNA Secondary Structures	1694
INOD	Counting Phylogenetic Ancestors	3397
MMCH	Maximum Matchings and RNA Secondary Structures	1929
REAR	Reversal Distance	1276
SSET	Counting Subsets	3075
ASPC	Introduction to Alternative Splicing	1960
MOTZ	Motzkin Numbers and RNA Secondary Structures	1043
SORT	Sorting by Reversals	956
RNAS	Wobble Bonding and RNA Secondary Structures	705
CTEA	Counting Optimal Alignments	527
CUNR	Counting Unrooted Binary Trees	468
CNTQ	Counting Quartets	266
EUBT	Enumerating Unrooted Binary Trees	251
ROOT	Counting Rooted Binary Trees	350