diff --git a/README.md b/README.md
index 9d774b8a..b03bc96d 100644
--- a/README.md
+++ b/README.md
@@ -589,3 +589,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 515. Find Largest Value in Each Tree Row                        | [Link](https://leetcode.com/problems/find-largest-value-in-each-tree-row/)                        | [Link](./lib/medium/515_find_largest_value_in_each_tree_row.rb)                        | [Link](./test/medium/test_515_find_largest_value_in_each_tree_row.rb)                        |
 | 516. Longest Palindromic Subsequence                            | [Link](https://leetcode.com/problems/longest-palindromic-subsequence/)                            | [Link](./lib/medium/516_longest_palindromic_subsequence.rb)                            | [Link](./test/medium/test_516_longest_palindromic_subsequence.rb)                            |
 | 523. Continuous Subarray Sum                                    | [Link](https://leetcode.com/problems/continuous-subarray-sum/)                                    | [Link](./lib/medium/523_continuous_subarray_sum.rb)                                    | [Link](./test/medium/test_523_continuous_subarray_sum.rb)                                    |
+| 524. Longest Word in Dictionary through Deleting                | [Link](https://leetcode.com/problems/longest-word-in-dictionary-through-deleting/)                | [Link](./lib/medium/524_longest_word_in_dictionary_through_deleting.rb)                | [Link](./test/medium/test_524_longest_word_in_dictionary_through_deleting.rb)                |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 6d531ed1..091173e0 100644
--- a/leetcode-ruby.gemspec
+++ b/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 = '7.2.3'
+  s.version = '7.2.4'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/524_longest_word_in_dictionary_through_deleting.rb b/lib/medium/524_longest_word_in_dictionary_through_deleting.rb
new file mode 100644
index 00000000..f6b54cd4
--- /dev/null
+++ b/lib/medium/524_longest_word_in_dictionary_through_deleting.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/longest-word-in-dictionary-through-deleting/
+# @param {String} s
+# @param {String[]} dictionary
+# @return {String}
+def find_longest_word(s, dictionary)
+  result = ''
+  dictionary.each do |word|
+    next unless is_valid_word_from_dictionary(s, word)
+
+    r_s = result.size
+    w_s = word.size
+
+    result = word if r_s == w_s && result > word || w_s > r_s
+  end
+
+  result
+end
+
+private
+
+# @param {String} s
+# @param {String} word
+# @return {Boolean}
+def is_valid_word_from_dictionary(s, word)
+  s_p = 0
+  w_p = 0
+  while s_p < s.size && w_p < word.size
+    w_p += s[s_p] == word[w_p] ? 1 : 0
+    s_p += 1
+  end
+
+  w_p == word.size
+end
diff --git a/test/medium/test_524_longest_word_in_dictionary_through_deleting.rb b/test/medium/test_524_longest_word_in_dictionary_through_deleting.rb
new file mode 100644
index 00000000..442bd179
--- /dev/null
+++ b/test/medium/test_524_longest_word_in_dictionary_through_deleting.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/524_longest_word_in_dictionary_through_deleting'
+require 'minitest/autorun'
+
+class LongestWordInDictionaryThroughDeletingTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      'apple',
+      find_longest_word(
+        'abpcplea',
+        %w[ale apple monkey plea]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      'a',
+      find_longest_word(
+        'abpcplea',
+        %w[a b c]
+      )
+    )
+  end
+end