2024-12-24 v. 7.4.6: added "692. Top K Frequent Words"

Author: fartem

README.md

@@ -610,3 +610,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 677. Map Sum Pairs                                              | [Link](https://leetcode.com/problems/map-sum-pairs/)                                              | [Link](./lib/medium/677_map_sum_pairs.rb)                                              | [Link](./test/medium/test_677_map_sum_pairs.rb)                                              |
 | 678. Valid Parenthesis String                                   | [Link](https://leetcode.com/problems/valid-parenthesis-string/)                                   | [Link](./lib/medium/678_valid_parenthesis_string.rb)                                   | [Link](./test/medium/test_678_valid_parenthesis_string.rb)                                   |
 | 687. Longest Univalue Path                                      | [Link](https://leetcode.com/problems/longest-univalue-path/)                                      | [Link](./lib/medium/687_longest_univalue_path.rb)                                      | [Link](./test/medium/test_687_longest_univalue_path.rb)                                      |
+| 692. Top K Frequent Words                                       | [Link](https://leetcode.com/problems/top-k-frequent-words/)                                       | [Link](./lib/medium/692_top_k_frequent_words.rb)                                       | [Link](./test/medium/test_692_top_k_frequent_words.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 = '7.4.5'
+  s.version = '7.4.6'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/692_top_k_frequent_words.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/top-k-frequent-words/
+# @param {String[]} words
+# @param {Integer} k
+# @return {String[]}
+def top_k_frequent_words(words, k)
+  values = words.each_with_object(::Hash.new(0)) { |e, total| total[e] += 1; }
+
+  to_sort = values.to_a
+  to_sort.sort! do |a, b|
+    diff = b[1] - a[1]
+    if diff.zero?
+      a[0] <=> b[0]
+    else
+      diff
+    end
+  end
+
+  to_sort[0...k].map(&:first)
+end

test/medium/test_692_top_k_frequent_words.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/692_top_k_frequent_words'
+require 'minitest/autorun'
+
+class TopKFrequentWordsTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      %w[i love],
+      top_k_frequent_words(
+        %w[i love leetcode i love coding],
+        2
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      %w[the is sunny day],
+      top_k_frequent_words(
+        %w[the day is sunny the the the sunny is is],
+        4
+      )
+    )
+  end
+end