Merge pull request #731 from fartem/187_Repeated_DNA_Sequences

2024-09-06 v. 6.6.4: added "187. Repeated DNA Sequences"

Author: fartem

README.md

@@ -529,3 +529,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 167. Two Sum II - Input Array Is Sorted                         | [Link](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/)                           | [Link](./lib/medium/167_two_sum_ii_input_array_is_sorted.rb)                           | [Link](./test/medium/test_167_two_sum_ii_input_array_is_sorted.rb)                           |
 | 173. Binary Search Tree Iterator                                | [Link](https://leetcode.com/problems/binary-search-tree-iterator/)                                | [Link](./lib/medium/173_binary_search_tree_iterator.rb)                                | [Link](./test/medium/test_173_binary_search_tree_iterator.rb)                                |
 | 179. Largest Number                                             | [Link](https://leetcode.com/problems/largest-number/)                                             | [Link](./lib/medium/179_largest_number.rb)                                             | [Link](./test/medium/test_179_largest_number.rb)                                             |
+| 187. Repeated DNA Sequences                                     | [Link](https://leetcode.com/problems/repeated-dna-sequences/)                                     | [Link](./lib/medium/187_repeated_dna_sequences.rb)                                     | [Link](./test/medium/test_187_repeated_dna_sequences.rb)                                     |

leetcode-ruby.gemspec

@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '6.6.3'
+  s.version = '6.6.4'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/187_repeated_dna_sequences.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/repeated-dna-sequences/
+# @param {String} s
+# @return {String[]}
+def find_repeated_dna_sequences(s)
+  return [] if s.size <= 10
+
+  seq = ::Set.new
+  rep = ::Set.new
+  (0...(s.size - 9)).each do |i|
+    sub = s[i...i + 10]
+
+    if seq.include?(sub)
+      rep << sub
+    else
+      seq << sub
+    end
+  end
+
+  rep.to_a
+end

test/medium/test_187_repeated_dna_sequences.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/187_repeated_dna_sequences'
+require 'minitest/autorun'
+
+class RepeatedDNASequencesTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      %w[AAAAACCCCC CCCCCAAAAA],
+      find_repeated_dna_sequences(
+        'AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      ['AAAAAAAAAA'],
+      find_repeated_dna_sequences(
+        'AAAAAAAAAAAAA'
+      )
+    )
+  end
+end