Combinatorics

The mathematics of counting objects.

ID	Title	Solved By	Correct Ratio
FIB	Rabbits and Recurrence Relations	35015
FIBD	Mortal Fibonacci Rabbits	14194
MRNA	Inferring mRNA from Protein	10912
ORF	Open Reading Frames	8352
PERM	Enumerating Gene Orders	14116
PMCH	Perfect Matchings and RNA Secondary Structures	4058
PPER	Partial Permutations	5350
SIGN	Enumerating Oriented Gene Orderings	5004
CAT	Catalan Numbers and RNA Secondary Structures	1665
INOD	Counting Phylogenetic Ancestors	3325
MMCH	Maximum Matchings and RNA Secondary Structures	1904
REAR	Reversal Distance	1258
SSET	Counting Subsets	3034
ASPC	Introduction to Alternative Splicing	1936
MOTZ	Motzkin Numbers and RNA Secondary Structures	1028
SORT	Sorting by Reversals	942
RNAS	Wobble Bonding and RNA Secondary Structures	694
CTEA	Counting Optimal Alignments	518
CUNR	Counting Unrooted Binary Trees	457
CNTQ	Counting Quartets	261
EUBT	Enumerating Unrooted Binary Trees	244
ROOT	Counting Rooted Binary Trees	344