Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	31114
FIBD	Mortal Fibonacci Rabbits	12736
MRNA	Inferring mRNA from Protein	9796
ORF	Open Reading Frames	7464
PERM	Enumerating Gene Orders	12882
PMCH	Perfect Matchings and RNA Secondary Structures	3620
PPER	Partial Permutations	4830
SIGN	Enumerating Oriented Gene Orderings	4585
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	915
SORT	Sorting by Reversals	868
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