Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	35698
FIBD	Mortal Fibonacci Rabbits	14469
MRNA	Inferring mRNA from Protein	11118
ORF	Open Reading Frames	8517
PERM	Enumerating Gene Orders	14329
PMCH	Perfect Matchings and RNA Secondary Structures	4147
PPER	Partial Permutations	5427
SIGN	Enumerating Oriented Gene Orderings	5095
CAT	Catalan Numbers and RNA Secondary Structures	1702
INOD	Counting Phylogenetic Ancestors	3409
MMCH	Maximum Matchings and RNA Secondary Structures	1940
REAR	Reversal Distance	1284
SSET	Counting Subsets	3085
ASPC	Introduction to Alternative Splicing	1966
MOTZ	Motzkin Numbers and RNA Secondary Structures	1047
SORT	Sorting by Reversals	959
RNAS	Wobble Bonding and RNA Secondary Structures	707
CTEA	Counting Optimal Alignments	530
CUNR	Counting Unrooted Binary Trees	469
CNTQ	Counting Quartets	267
EUBT	Enumerating Unrooted Binary Trees	252
ROOT	Counting Rooted Binary Trees	351