Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	26688
FIBD	Mortal Fibonacci Rabbits	11149
MRNA	Inferring mRNA from Protein	8566
ORF	Open Reading Frames	6570
PERM	Enumerating Gene Orders	11451
PMCH	Perfect Matchings and RNA Secondary Structures	3095
PPER	Partial Permutations	4207
SIGN	Enumerating Oriented Gene Orderings	4105
CAT	Catalan Numbers and RNA Secondary Structures	1260
INOD	Counting Phylogenetic Ancestors	2661
MMCH	Maximum Matchings and RNA Secondary Structures	1511
REAR	Reversal Distance	1018
SSET	Counting Subsets	2446
ASPC	Introduction to Alternative Splicing	1566
MOTZ	Motzkin Numbers and RNA Secondary Structures	787
SORT	Sorting by Reversals	765
RNAS	Wobble Bonding and RNA Secondary Structures	537
CTEA	Counting Optimal Alignments	382
CUNR	Counting Unrooted Binary Trees	336
CNTQ	Counting Quartets	199
EUBT	Enumerating Unrooted Binary Trees	180
ROOT	Counting Rooted Binary Trees	279