Problems

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Problems: 285 (total), users: 44689, attempts: 757554, correct: 428178
ID Title Solved By Correct Ratio
BA10A Compute the Probability of a Hidden Path 257
BA10B Compute the Probability of an Outcome Given a Hidden Path 217
BA10C Implement the Viterbi Algorithm 132
BA10D Compute the Probability of a String Emitted by an HMM 119
BA10E Construct a Profile HMM 84
BA10F Construct a Profile HMM with Pseudocounts 74
BA10G Perform a Multiple Sequence Alignment with a Profile HMM 33
BA10H Estimate the Parameters of an HMM 49
BA10I Implement Viterbi Learning 39
BA10J Solve the Soft Decoding Problem 38
BA10K Implement Baum-Welch Learning 29
BA11A Construct the Graph of a Spectrum 67
BA11B Implement DecodingIdealSpectrum 50
BA11C Convert a Peptide into a Peptide Vector 73
BA11D Convert a Peptide Vector into a Peptide 67
BA11E Sequence a Peptide 42
BA11F Find a Highest-Scoring Peptide in a Proteome against a Spectrum 43
BA11G Implement PSMSearch 41
BA11H Compute the Size of a Spectral Dictionary 35
BA11I Compute the Probability of a Spectral Dictionary 34
BA11J Find a Highest-Scoring Modified Peptide against a Spectrum 26
BA1A Compute the Number of Times a Pattern Appears in a Text 517
BA1B Find the Most Frequent Words in a String 700
BA1C Find the Reverse Complement of a String 624
BA1D Find All Occurrences of a Pattern in a String 590
BA1E Find Patterns Forming Clumps in a String 472
BA1F Find a Position in a Genome Minimizing the Skew 455
BA1G Compute the Hamming Distance Between Two Strings 438
BA1H Find All Approximate Occurrences of a Pattern in a String 456
BA1I Find the Most Frequent Words with Mismatches in a String 358
BA1J Find Frequent Words with Mismatches and Reverse Complements 326
BA1K Generate the Frequency Array of a String 287
BA1L Implement PatternToNumber 323
BA1M Implement NumberToPattern 290
BA1N Generate the d-Neighborhood of a String 320
BA2A Implement MotifEnumeration 270
BA2B Find a Median String 232
BA2C Find a Profile-most Probable k-mer in a String 247
BA2D Implement GreedyMotifSearch 199
BA2E Implement GreedyMotifSearch with Pseudocounts 167
BA2F Implement RandomizedMotifSearch 142
BA2G Implement GibbsSampler 131
BA2H Implement DistanceBetweenPatternAndStrings 165
BA3A Generate the k-mer Composition of a String 286
BA3B Reconstruct a String from its Genome Path 231
BA3C Construct the Overlap Graph of a Collection of k-mers 231
BA3D Construct the De Bruijn Graph of a String 220
BA3E Construct the De Bruijn Graph of a Collection of k-mers 202
BA3F Find an Eulerian Cycle in a Graph 153
BA3G Find an Eulerian Path in a Graph 142
BA3H Reconstruct a String from its k-mer Composition 145
BA3I Find a k-Universal Circular String 117
BA3J Reconstruct a String from its Paired Composition 92
BA3K Generate Contigs from a Collection of Reads 105
BA3L Construct a String Spelled by a Gapped Genome Path 85
BA3M Generate All Maximal Non-Branching Paths in a Graph 86
BA4A Translate an RNA String into an Amino Acid String 203
BA4B Find Substrings of a Genome Encoding a Given Amino Acid String 161
BA4C Generate the Theoretical Spectrum of a Cyclic Peptide 162
BA4D Compute the Number of Peptides of Given Total Mass 79
BA4E Find a Cyclic Peptide with Theoretical Spectrum Matching an Ideal Spectrum 108
BA4F Compute the Score of a Cyclic Peptide Against a Spectrum 94
BA4G Implement LeaderboardCyclopeptideSequencing 91
BA4H Generate the Convolution of a Spectrum 94
BA4I Implement ConvolutionCyclopeptideSequencing 63
BA4J Generate the Theoretical Spectrum of a Linear Peptide 97
BA4K Compute the Score of a Linear Peptide 81
BA4L Trim a Peptide Leaderboard 71
BA4M Solve the Turnpike Problem 43
BA5A Find the Minimum Number of Coins Needed to Make Change 365
BA5B Find the Length of a Longest Path in a Manhattan-like Grid 306
BA5C Find a Longest Common Subsequence of Two Strings 363
BA5D Find the Longest Path in a DAG 253
BA5E Find a Highest-Scoring Alignment of Two Strings 280
BA5F Find a Highest-Scoring Local Alignment of Two Strings 244
BA5G Compute the Edit Distance Between Two Strings 308
BA5H Find a Highest-Scoring Fitting Alignment of Two Strings 204
BA5I Find a Highest-Scoring Overlap Alignment of Two Strings 186
BA5J Align Two Strings Using Affine Gap Penalties 172
BA5K Find a Middle Edge in an Alignment Graph in Linear Space 122
BA5L Align Two Strings Using Linear Space 102
BA5M Find a Highest-Scoring Multiple Sequence Alignment 127
BA5N Find a Topological Ordering of a DAG 74
BA6A Implement GreedySorting to Sort a Permutation by Reversals 225
BA6B Compute the Number of Breakpoints in a Permutation 243
BA6C Compute the 2-Break Distance Between a Pair of Genomes 158
BA6D Find a Shortest Transformation of One Genome into Another by 2-Breaks 33
BA6E Find All Shared k-mers of a Pair of Strings 167
BA6F Implement ChromosomeToCycle 88
BA6G Implement CycleToChromosome 83
BA6H Implement ColoredEdges 77
BA6I Implement GraphToGenome 61
BA6J Implement 2-BreakOnGenomeGraph 57
BA6K Implement 2-BreakOnGenome 41
BA7A Compute Distances Between Leaves 97
BA7B Compute Limb Lengths in a Tree 89
BA7C Implement AdditivePhylogeny 59
BA7D Implement UPGMA 54
BA7E Implement the Neighbor Joining Algorithm 48
BA7F Implement SmallParsimony 41
BA7G Adapt SmallParsimony to Unrooted Trees 26
BA8A Implement FarthestFirstTraversal 69
BA8B Compute the Squared Error Distortion 68
BA8C Implement the Lloyd Algorithm for k-Means Clustering 64
BA8D Implement the Soft k-Means Clustering Algorithm 58
BA8E Implement Hierarchical Clustering 50
BA9A Construct a Trie from a Collection of Patterns 191
BA9B Implement TrieMatching 168
BA9C Construct the Suffix Tree of a String 130
BA9D Find the Longest Repeat in a String 147
BA9E Find the Longest Substring Shared by Two Strings 145
BA9F Find the Shortest Non-Shared Substring of Two Strings 114
BA9G Construct the Suffix Array of a String 148
BA9H Pattern Matching with the Suffix Array 71
BA9I Construct the Burrows-Wheeler Transform of a String 171
BA9J Reconstruct a String from its Burrows-Wheeler Transform 143
BA9K Generate the Last-to-First Mapping of a String 63
BA9L Implement BWMatching 110
BA9M Implement BetterBWMatching 104
BA9N Find All Occurrences of a Collection of Patterns in a String 115
BA9O Find All Approximate Occurrences of a Collection of Patterns in a String 88
BA9P Implement TreeColoring 38
BA9Q Construct the Partial Suffix Array of a String 92
BA9R Construct a Suffix Tree from a Suffix Array 66