Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	32398
FIBD	Mortal Fibonacci Rabbits	13255
MRNA	Inferring mRNA from Protein	10234
ORF	Open Reading Frames	7779
PERM	Enumerating Gene Orders	13339
PMCH	Perfect Matchings and RNA Secondary Structures	3797
PPER	Partial Permutations	5049
SIGN	Enumerating Oriented Gene Orderings	4750
CAT	Catalan Numbers and RNA Secondary Structures	1542
INOD	Counting Phylogenetic Ancestors	3138
MMCH	Maximum Matchings and RNA Secondary Structures	1787
REAR	Reversal Distance	1193
SSET	Counting Subsets	2878
ASPC	Introduction to Alternative Splicing	1835
MOTZ	Motzkin Numbers and RNA Secondary Structures	960
SORT	Sorting by Reversals	901
RNAS	Wobble Bonding and RNA Secondary Structures	655
CTEA	Counting Optimal Alignments	463
CUNR	Counting Unrooted Binary Trees	434
CNTQ	Counting Quartets	243
EUBT	Enumerating Unrooted Binary Trees	229
ROOT	Counting Rooted Binary Trees	327