Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	35498
FIBD	Mortal Fibonacci Rabbits	14390
MRNA	Inferring mRNA from Protein	11047
ORF	Open Reading Frames	8472
PERM	Enumerating Gene Orders	14261
PMCH	Perfect Matchings and RNA Secondary Structures	4126
PPER	Partial Permutations	5402
SIGN	Enumerating Oriented Gene Orderings	5053
CAT	Catalan Numbers and RNA Secondary Structures	1692
INOD	Counting Phylogenetic Ancestors	3393
MMCH	Maximum Matchings and RNA Secondary Structures	1928
REAR	Reversal Distance	1275
SSET	Counting Subsets	3073
ASPC	Introduction to Alternative Splicing	1959
MOTZ	Motzkin Numbers and RNA Secondary Structures	1042
SORT	Sorting by Reversals	955
RNAS	Wobble Bonding and RNA Secondary Structures	705
CTEA	Counting Optimal Alignments	527
CUNR	Counting Unrooted Binary Trees	468
CNTQ	Counting Quartets	266
EUBT	Enumerating Unrooted Binary Trees	250
ROOT	Counting Rooted Binary Trees	349