Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	36385
FIBD	Mortal Fibonacci Rabbits	14713
MRNA	Inferring mRNA from Protein	11300
ORF	Open Reading Frames	8662
PERM	Enumerating Gene Orders	14523
PMCH	Perfect Matchings and RNA Secondary Structures	4223
PPER	Partial Permutations	5509
SIGN	Enumerating Oriented Gene Orderings	5160
CAT	Catalan Numbers and RNA Secondary Structures	1754
INOD	Counting Phylogenetic Ancestors	3457
MMCH	Maximum Matchings and RNA Secondary Structures	1978
REAR	Reversal Distance	1317
SSET	Counting Subsets	3127
ASPC	Introduction to Alternative Splicing	2006
MOTZ	Motzkin Numbers and RNA Secondary Structures	1083
SORT	Sorting by Reversals	985
RNAS	Wobble Bonding and RNA Secondary Structures	736
CTEA	Counting Optimal Alignments	553
CUNR	Counting Unrooted Binary Trees	486
CNTQ	Counting Quartets	279
EUBT	Enumerating Unrooted Binary Trees	265
ROOT	Counting Rooted Binary Trees	361