Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34527
FIBD	Mortal Fibonacci Rabbits	14045
MRNA	Inferring mRNA from Protein	10808
ORF	Open Reading Frames	8240
PERM	Enumerating Gene Orders	13979
PMCH	Perfect Matchings and RNA Secondary Structures	4018
PPER	Partial Permutations	5306
SIGN	Enumerating Oriented Gene Orderings	4968
CAT	Catalan Numbers and RNA Secondary Structures	1646
INOD	Counting Phylogenetic Ancestors	3300
MMCH	Maximum Matchings and RNA Secondary Structures	1891
REAR	Reversal Distance	1251
SSET	Counting Subsets	3019
ASPC	Introduction to Alternative Splicing	1924
MOTZ	Motzkin Numbers and RNA Secondary Structures	1018
SORT	Sorting by Reversals	936
RNAS	Wobble Bonding and RNA Secondary Structures	689
CTEA	Counting Optimal Alignments	516
CUNR	Counting Unrooted Binary Trees	454
CNTQ	Counting Quartets	259
EUBT	Enumerating Unrooted Binary Trees	238
ROOT	Counting Rooted Binary Trees	340