Problems

Combinatorics

The mathematics of counting objects.

ID Title Solved By Correct Ratio
FIB Rabbits and Recurrence Relations 33239
FIBD Mortal Fibonacci Rabbits 13553
MRNA Inferring mRNA from Protein 10449
ORF Open Reading Frames 7938
PERM Enumerating Gene Orders 13581
PMCH Perfect Matchings and RNA Secondary Structures 3879
PPER Partial Permutations 5150
SIGN Enumerating Oriented Gene Orderings 4841
CAT Catalan Numbers and RNA Secondary Structures 1575
INOD Counting Phylogenetic Ancestors 3194
MMCH Maximum Matchings and RNA Secondary Structures 1826
REAR Reversal Distance 1214
SSET Counting Subsets 2934
ASPC Introduction to Alternative Splicing 1877
MOTZ Motzkin Numbers and RNA Secondary Structures 983
SORT Sorting by Reversals 913
RNAS Wobble Bonding and RNA Secondary Structures 666
CTEA Counting Optimal Alignments 500
CUNR Counting Unrooted Binary Trees 438
CNTQ Counting Quartets 248
EUBT Enumerating Unrooted Binary Trees 232
ROOT Counting Rooted Binary Trees 331

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