Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	31138
FIBD	Mortal Fibonacci Rabbits	12749
MRNA	Inferring mRNA from Protein	9805
ORF	Open Reading Frames	7469
PERM	Enumerating Gene Orders	12889
PMCH	Perfect Matchings and RNA Secondary Structures	3621
PPER	Partial Permutations	4831
SIGN	Enumerating Oriented Gene Orderings	4589
CAT	Catalan Numbers and RNA Secondary Structures	1470
INOD	Counting Phylogenetic Ancestors	3025
MMCH	Maximum Matchings and RNA Secondary Structures	1718
REAR	Reversal Distance	1155
SSET	Counting Subsets	2773
ASPC	Introduction to Alternative Splicing	1772
MOTZ	Motzkin Numbers and RNA Secondary Structures	916
SORT	Sorting by Reversals	870
RNAS	Wobble Bonding and RNA Secondary Structures	629
CTEA	Counting Optimal Alignments	440
CUNR	Counting Unrooted Binary Trees	416
CNTQ	Counting Quartets	234
EUBT	Enumerating Unrooted Binary Trees	220
ROOT	Counting Rooted Binary Trees	316