Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	32829
FIBD	Mortal Fibonacci Rabbits	13398
MRNA	Inferring mRNA from Protein	10350
ORF	Open Reading Frames	7871
PERM	Enumerating Gene Orders	13474
PMCH	Perfect Matchings and RNA Secondary Structures	3846
PPER	Partial Permutations	5113
SIGN	Enumerating Oriented Gene Orderings	4806
CAT	Catalan Numbers and RNA Secondary Structures	1561
INOD	Counting Phylogenetic Ancestors	3171
MMCH	Maximum Matchings and RNA Secondary Structures	1812
REAR	Reversal Distance	1207
SSET	Counting Subsets	2912
ASPC	Introduction to Alternative Splicing	1860
MOTZ	Motzkin Numbers and RNA Secondary Structures	973
SORT	Sorting by Reversals	909
RNAS	Wobble Bonding and RNA Secondary Structures	660
CTEA	Counting Optimal Alignments	493
CUNR	Counting Unrooted Binary Trees	436
CNTQ	Counting Quartets	246
EUBT	Enumerating Unrooted Binary Trees	230
ROOT	Counting Rooted Binary Trees	329