Merge pull request #724 from fartem/151_Reverse_Words_in_a_String

2024-08-29 v. 6.5.8: added "151. Reverse Words in a String"

Author: fartem

README.md

@@ -523,3 +523,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 147. Insertion Sort List                                        | [Link](https://leetcode.com/problems/insertion-sort-list/)                                        | [Link](./lib/medium/147_insertion_sort_list.rb)                                        | [Link](./test/medium/test_147_insertion_sort_list.rb)                                        |
 | 148. Sort List                                                  | [Link](https://leetcode.com/problems/sort-list/)                                                  | [Link](./lib/medium/148_sort_list.rb)                                                  | [Link](./test/medium/test_148_sort_list.rb)                                                  |
 | 150. Evaluate Reverse Polish Notation                           | [Link](https://leetcode.com/problems/evaluate-reverse-polish-notation/)                           | [Link](./lib/medium/150_evaluate_reverse_polish_notation.rb)                           | [Link](./test/medium/test_150_evaluate_reverse_polish_notation.rb)                           |
+| 151. Reverse Words in a String                                  | [Link](https://leetcode.com/problems/reverse-words-in-a-string/)                                  | [Link](./lib/medium/151_reverse_words_in_a_string.rb)                                  | [Link](./test/medium/test_151_reverse_words_in_a_string.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 = '6.5.7'
+  s.version = '6.5.8'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/151_reverse_words_in_a_string.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/reverse-words-in-a-string/
+# @param {String} s
+# @return {String}
+def reverse_words151(s)
+  result = []
+  word = []
+  s.each_char do |c|
+    if c =~ /[a-zA-Z0-9]/
+      word << c
+    else
+      result << word.join unless word.empty?
+
+      word.clear
+    end
+  end
+
+  result << word.join unless word.empty?
+
+  result.reverse.join(' ')
+end

test/medium/test_151_reverse_words_in_a_string.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/151_reverse_words_in_a_string'
+require 'minitest/autorun'
+
+class ReverseWordsInAStringTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      'blue is sky the',
+      reverse_words151(
+        'the sky is blue'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      'world hello',
+      reverse_words151(
+        '  hello world  '
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      'example good a',
+      reverse_words151(
+        'a good   example'
+      )
+    )
+  end
+end