Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34637
FIBD	Mortal Fibonacci Rabbits	14082
MRNA	Inferring mRNA from Protein	10837
ORF	Open Reading Frames	8269
PERM	Enumerating Gene Orders	14029
PMCH	Perfect Matchings and RNA Secondary Structures	4028
PPER	Partial Permutations	5320
SIGN	Enumerating Oriented Gene Orderings	4979
CAT	Catalan Numbers and RNA Secondary Structures	1654
INOD	Counting Phylogenetic Ancestors	3307
MMCH	Maximum Matchings and RNA Secondary Structures	1894
REAR	Reversal Distance	1253
SSET	Counting Subsets	3023
ASPC	Introduction to Alternative Splicing	1926
MOTZ	Motzkin Numbers and RNA Secondary Structures	1020
SORT	Sorting by Reversals	938
RNAS	Wobble Bonding and RNA Secondary Structures	690
CTEA	Counting Optimal Alignments	516
CUNR	Counting Unrooted Binary Trees	454
CNTQ	Counting Quartets	259
EUBT	Enumerating Unrooted Binary Trees	240
ROOT	Counting Rooted Binary Trees	340