Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	33301
FIBD	Mortal Fibonacci Rabbits	13582
MRNA	Inferring mRNA from Protein	10468
ORF	Open Reading Frames	7952
PERM	Enumerating Gene Orders	13610
PMCH	Perfect Matchings and RNA Secondary Structures	3887
PPER	Partial Permutations	5162
SIGN	Enumerating Oriented Gene Orderings	4844
CAT	Catalan Numbers and RNA Secondary Structures	1576
INOD	Counting Phylogenetic Ancestors	3197
MMCH	Maximum Matchings and RNA Secondary Structures	1828
REAR	Reversal Distance	1214
SSET	Counting Subsets	2938
ASPC	Introduction to Alternative Splicing	1878
MOTZ	Motzkin Numbers and RNA Secondary Structures	984
SORT	Sorting by Reversals	914
RNAS	Wobble Bonding and RNA Secondary Structures	666
CTEA	Counting Optimal Alignments	501
CUNR	Counting Unrooted Binary Trees	439
CNTQ	Counting Quartets	248
EUBT	Enumerating Unrooted Binary Trees	232
ROOT	Counting Rooted Binary Trees	332