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Problems
Combinatorics
The mathematics of counting objects.
ID
Title
Solved By
Correct Ratio
FIB
Rabbits and Recurrence Relations
26688
FIBD
Mortal Fibonacci Rabbits
11149
MRNA
Inferring mRNA from Protein
8566
ORF
Open Reading Frames
6570
PERM
Enumerating Gene Orders
11451
PMCH
Perfect Matchings and RNA Secondary Structures
3095
PPER
Partial Permutations
4207
SIGN
Enumerating Oriented Gene Orderings
4105
CAT
Catalan Numbers and RNA Secondary Structures
1260
INOD
Counting Phylogenetic Ancestors
2661
MMCH
Maximum Matchings and RNA Secondary Structures
1511
REAR
Reversal Distance
1018
SSET
Counting Subsets
2446
ASPC
Introduction to Alternative Splicing
1566
MOTZ
Motzkin Numbers and RNA Secondary Structures
787
SORT
Sorting by Reversals
765
RNAS
Wobble Bonding and RNA Secondary Structures
537
CTEA
Counting Optimal Alignments
382
CUNR
Counting Unrooted Binary Trees
336
CNTQ
Counting Quartets
199
EUBT
Enumerating Unrooted Binary Trees
180
ROOT
Counting Rooted Binary Trees
279
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