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Problems
Combinatorics
The mathematics of counting objects.
ID
Title
Solved By
Correct Ratio
FIB
Rabbits and Recurrence Relations
28411
FIBD
Mortal Fibonacci Rabbits
11737
MRNA
Inferring mRNA from Protein
8999
ORF
Open Reading Frames
6923
PERM
Enumerating Gene Orders
11988
PMCH
Perfect Matchings and RNA Secondary Structures
3305
PPER
Partial Permutations
4455
SIGN
Enumerating Oriented Gene Orderings
4270
CAT
Catalan Numbers and RNA Secondary Structures
1326
INOD
Counting Phylogenetic Ancestors
2768
MMCH
Maximum Matchings and RNA Secondary Structures
1588
REAR
Reversal Distance
1065
SSET
Counting Subsets
2548
ASPC
Introduction to Alternative Splicing
1637
MOTZ
Motzkin Numbers and RNA Secondary Structures
833
SORT
Sorting by Reversals
801
RNAS
Wobble Bonding and RNA Secondary Structures
570
CTEA
Counting Optimal Alignments
405
CUNR
Counting Unrooted Binary Trees
355
CNTQ
Counting Quartets
211
EUBT
Enumerating Unrooted Binary Trees
188
ROOT
Counting Rooted Binary Trees
288
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