Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	38048
FIBD	Mortal Fibonacci Rabbits	15342
MRNA	Inferring mRNA from Protein	11700
ORF	Open Reading Frames	8867
PERM	Enumerating Gene Orders	15170
PMCH	Perfect Matchings and RNA Secondary Structures	4335
PPER	Partial Permutations	5691
SIGN	Enumerating Oriented Gene Orderings	5288
CAT	Catalan Numbers and RNA Secondary Structures	1810
INOD	Counting Phylogenetic Ancestors	3536
MMCH	Maximum Matchings and RNA Secondary Structures	2033
REAR	Reversal Distance	1422
SSET	Counting Subsets	3177
ASPC	Introduction to Alternative Splicing	2048
MOTZ	Motzkin Numbers and RNA Secondary Structures	1121
SORT	Sorting by Reversals	1065
RNAS	Wobble Bonding and RNA Secondary Structures	760
CTEA	Counting Optimal Alignments	937
CUNR	Counting Unrooted Binary Trees	500
CNTQ	Counting Quartets	291
EUBT	Enumerating Unrooted Binary Trees	279
ROOT	Counting Rooted Binary Trees	374