Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	36067
FIBD	Mortal Fibonacci Rabbits	14606
MRNA	Inferring mRNA from Protein	11224
ORF	Open Reading Frames	8593
PERM	Enumerating Gene Orders	14435
PMCH	Perfect Matchings and RNA Secondary Structures	4193
PPER	Partial Permutations	5481
SIGN	Enumerating Oriented Gene Orderings	5132
CAT	Catalan Numbers and RNA Secondary Structures	1731
INOD	Counting Phylogenetic Ancestors	3436
MMCH	Maximum Matchings and RNA Secondary Structures	1962
REAR	Reversal Distance	1300
SSET	Counting Subsets	3111
ASPC	Introduction to Alternative Splicing	1991
MOTZ	Motzkin Numbers and RNA Secondary Structures	1070
SORT	Sorting by Reversals	972
RNAS	Wobble Bonding and RNA Secondary Structures	726
CTEA	Counting Optimal Alignments	538
CUNR	Counting Unrooted Binary Trees	475
CNTQ	Counting Quartets	273
EUBT	Enumerating Unrooted Binary Trees	258
ROOT	Counting Rooted Binary Trees	357