Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	34775
FIBD	Mortal Fibonacci Rabbits	14127
MRNA	Inferring mRNA from Protein	10862
ORF	Open Reading Frames	8288
PERM	Enumerating Gene Orders	14050
PMCH	Perfect Matchings and RNA Secondary Structures	4041
PPER	Partial Permutations	5336
SIGN	Enumerating Oriented Gene Orderings	4991
CAT	Catalan Numbers and RNA Secondary Structures	1658
INOD	Counting Phylogenetic Ancestors	3316
MMCH	Maximum Matchings and RNA Secondary Structures	1896
REAR	Reversal Distance	1254
SSET	Counting Subsets	3027
ASPC	Introduction to Alternative Splicing	1928
MOTZ	Motzkin Numbers and RNA Secondary Structures	1022
SORT	Sorting by Reversals	938
RNAS	Wobble Bonding and RNA Secondary Structures	691
CTEA	Counting Optimal Alignments	517
CUNR	Counting Unrooted Binary Trees	456
CNTQ	Counting Quartets	259
EUBT	Enumerating Unrooted Binary Trees	242
ROOT	Counting Rooted Binary Trees	342