Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	33903
FIBD	Mortal Fibonacci Rabbits	13809
MRNA	Inferring mRNA from Protein	10649
ORF	Open Reading Frames	8090
PERM	Enumerating Gene Orders	13814
PMCH	Perfect Matchings and RNA Secondary Structures	3955
PPER	Partial Permutations	5238
SIGN	Enumerating Oriented Gene Orderings	4915
CAT	Catalan Numbers and RNA Secondary Structures	1612
INOD	Counting Phylogenetic Ancestors	3259
MMCH	Maximum Matchings and RNA Secondary Structures	1855
REAR	Reversal Distance	1225
SSET	Counting Subsets	2983
ASPC	Introduction to Alternative Splicing	1899
MOTZ	Motzkin Numbers and RNA Secondary Structures	996
SORT	Sorting by Reversals	923
RNAS	Wobble Bonding and RNA Secondary Structures	675
CTEA	Counting Optimal Alignments	507
CUNR	Counting Unrooted Binary Trees	448
CNTQ	Counting Quartets	254
EUBT	Enumerating Unrooted Binary Trees	236
ROOT	Counting Rooted Binary Trees	336