Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	36491
FIBD	Mortal Fibonacci Rabbits	14755
MRNA	Inferring mRNA from Protein	11327
ORF	Open Reading Frames	8681
PERM	Enumerating Gene Orders	14542
PMCH	Perfect Matchings and RNA Secondary Structures	4235
PPER	Partial Permutations	5520
SIGN	Enumerating Oriented Gene Orderings	5170
CAT	Catalan Numbers and RNA Secondary Structures	1755
INOD	Counting Phylogenetic Ancestors	3459
MMCH	Maximum Matchings and RNA Secondary Structures	1983
REAR	Reversal Distance	1321
SSET	Counting Subsets	3131
ASPC	Introduction to Alternative Splicing	2008
MOTZ	Motzkin Numbers and RNA Secondary Structures	1085
SORT	Sorting by Reversals	989
RNAS	Wobble Bonding and RNA Secondary Structures	739
CTEA	Counting Optimal Alignments	555
CUNR	Counting Unrooted Binary Trees	488
CNTQ	Counting Quartets	280
EUBT	Enumerating Unrooted Binary Trees	267
ROOT	Counting Rooted Binary Trees	363