Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34883
FIBD	Mortal Fibonacci Rabbits	14153
MRNA	Inferring mRNA from Protein	10879
ORF	Open Reading Frames	8322
PERM	Enumerating Gene Orders	14064
PMCH	Perfect Matchings and RNA Secondary Structures	4048
PPER	Partial Permutations	5341
SIGN	Enumerating Oriented Gene Orderings	4995
CAT	Catalan Numbers and RNA Secondary Structures	1659
INOD	Counting Phylogenetic Ancestors	3318
MMCH	Maximum Matchings and RNA Secondary Structures	1898
REAR	Reversal Distance	1254
SSET	Counting Subsets	3027
ASPC	Introduction to Alternative Splicing	1929
MOTZ	Motzkin Numbers and RNA Secondary Structures	1023
SORT	Sorting by Reversals	939
RNAS	Wobble Bonding and RNA Secondary Structures	692
CTEA	Counting Optimal Alignments	517
CUNR	Counting Unrooted Binary Trees	456
CNTQ	Counting Quartets	260
EUBT	Enumerating Unrooted Binary Trees	244
ROOT	Counting Rooted Binary Trees	343