2025-04-24 v. 9.3.3: added "3210. Find the Encrypted String"

Author: fartem

README.md

@@ -463,6 +463,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 3131. Find the Integer Added to Array I                            | [Link](https://leetcode.com/problems/find-the-integer-added-to-array-i/)                            | [Link](./lib/easy/3131_find_the_integer_added_to_array_i.rb)                            | [Link](./test/easy/test_3131_find_the_integer_added_to_array_i.rb)                            |
 | 3136. Valid Word                                                   | [Link](https://leetcode.com/problems/valid-word/)                                                   | [Link](./lib/easy/3136_valid_word.rb)                                                   | [Link](./test/easy/test_3136_valid_word.rb)                                                   |
 | 3151. Special Array I                                              | [Link](https://leetcode.com/problems/special-array-i/)                                              | [Link](./lib/easy/3151_special_array_i.rb)                                              | [Link](./test/easy/test_3151_special_array_i.rb)                                              |
+| 3210. Find the Encrypted String                                    | [Link](https://leetcode.com/problems/find-the-encrypted-string/)                                    | [Link](./lib/easy/3210_find_the_encrypted_string.rb)                                    | [Link](./test/easy/test_3210_find_the_encrypted_string.rb)                                    |
 | 3498. Reverse Degree of a String                                   | [Link](https://leetcode.com/problems/reverse-degree-of-a-string/)                                   | [Link](./lib/easy/3498_reverse_degree_of_a_string.rb)                                   | [Link](./test/easy/test_3498_reverse_degree_of_a_string.rb)                                   |
 
 ### Medium

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 = '9.3.2'
+  s.version = '9.3.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/easy/3210_find_the_encrypted_string.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/find-the-encrypted-string/
+# @param {String} s
+# @param {Integer} k
+# @return {String}
+def get_encrypted_string(s, k)
+  result = ::Array.new(s.size)
+
+  (0...s.size).each do |i|
+    if i + k < s.size
+      result << s[i + k]
+    else
+      index = i + k
+
+      index = (s.size - index).abs until index < s.size
+
+      result << s[index]
+    end
+  end
+
+  result.join
+end

test/easy/test_3210_find_the_encrypted_string.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/3210_find_the_encrypted_string'
+require 'minitest/autorun'
+
+class FindTheEncryptedStringTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      'tdar',
+      get_encrypted_string(
+        'dart',
+        3
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      'aaa',
+      get_encrypted_string(
+        'aaa',
+        1
+      )
+    )
+  end
+end