Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	27494
FIBD	Mortal Fibonacci Rabbits	11436
MRNA	Inferring mRNA from Protein	8785
ORF	Open Reading Frames	6738
PERM	Enumerating Gene Orders	11698
PMCH	Perfect Matchings and RNA Secondary Structures	3192
PPER	Partial Permutations	4317
SIGN	Enumerating Oriented Gene Orderings	4183
CAT	Catalan Numbers and RNA Secondary Structures	1289
INOD	Counting Phylogenetic Ancestors	2707
MMCH	Maximum Matchings and RNA Secondary Structures	1552
REAR	Reversal Distance	1040
SSET	Counting Subsets	2499
ASPC	Introduction to Alternative Splicing	1600
MOTZ	Motzkin Numbers and RNA Secondary Structures	806
SORT	Sorting by Reversals	779
RNAS	Wobble Bonding and RNA Secondary Structures	552
CTEA	Counting Optimal Alignments	394
CUNR	Counting Unrooted Binary Trees	346
CNTQ	Counting Quartets	206
EUBT	Enumerating Unrooted Binary Trees	183
ROOT	Counting Rooted Binary Trees	283