Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34463
FIBD	Mortal Fibonacci Rabbits	14021
MRNA	Inferring mRNA from Protein	10786
ORF	Open Reading Frames	8221
PERM	Enumerating Gene Orders	13958
PMCH	Perfect Matchings and RNA Secondary Structures	4012
PPER	Partial Permutations	5301
SIGN	Enumerating Oriented Gene Orderings	4964
CAT	Catalan Numbers and RNA Secondary Structures	1644
INOD	Counting Phylogenetic Ancestors	3300
MMCH	Maximum Matchings and RNA Secondary Structures	1890
REAR	Reversal Distance	1249
SSET	Counting Subsets	3018
ASPC	Introduction to Alternative Splicing	1923
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	515
CUNR	Counting Unrooted Binary Trees	452
CNTQ	Counting Quartets	257
EUBT	Enumerating Unrooted Binary Trees	238
ROOT	Counting Rooted Binary Trees	339