Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34498
FIBD	Mortal Fibonacci Rabbits	14033
MRNA	Inferring mRNA from Protein	10799
ORF	Open Reading Frames	8235
PERM	Enumerating Gene Orders	13971
PMCH	Perfect Matchings and RNA Secondary Structures	4016
PPER	Partial Permutations	5303
SIGN	Enumerating Oriented Gene Orderings	4965
CAT	Catalan Numbers and RNA Secondary Structures	1644
INOD	Counting Phylogenetic Ancestors	3300
MMCH	Maximum Matchings and RNA Secondary Structures	1891
REAR	Reversal Distance	1250
SSET	Counting Subsets	3019
ASPC	Introduction to Alternative Splicing	1924
MOTZ	Motzkin Numbers and RNA Secondary Structures	1015
SORT	Sorting by Reversals	935
RNAS	Wobble Bonding and RNA Secondary Structures	688
CTEA	Counting Optimal Alignments	516
CUNR	Counting Unrooted Binary Trees	453
CNTQ	Counting Quartets	257
EUBT	Enumerating Unrooted Binary Trees	238
ROOT	Counting Rooted Binary Trees	340