Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	33844
FIBD	Mortal Fibonacci Rabbits	13779
MRNA	Inferring mRNA from Protein	10637
ORF	Open Reading Frames	8079
PERM	Enumerating Gene Orders	13796
PMCH	Perfect Matchings and RNA Secondary Structures	3950
PPER	Partial Permutations	5232
SIGN	Enumerating Oriented Gene Orderings	4909
CAT	Catalan Numbers and RNA Secondary Structures	1608
INOD	Counting Phylogenetic Ancestors	3252
MMCH	Maximum Matchings and RNA Secondary Structures	1852
REAR	Reversal Distance	1223
SSET	Counting Subsets	2976
ASPC	Introduction to Alternative Splicing	1895
MOTZ	Motzkin Numbers and RNA Secondary Structures	993
SORT	Sorting by Reversals	922
RNAS	Wobble Bonding and RNA Secondary Structures	673
CTEA	Counting Optimal Alignments	507
CUNR	Counting Unrooted Binary Trees	447
CNTQ	Counting Quartets	254
EUBT	Enumerating Unrooted Binary Trees	236
ROOT	Counting Rooted Binary Trees	336