2025-02-28 v. 8.7.6: added "1670. Design Front Middle Back Queue"

Author: fartem

README.md

@@ -709,6 +709,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1630. Arithmetic Subarrays                                                          | [Link](https://leetcode.com/problems/arithmetic-subarrays/)                                                          | [Link](./lib/medium/1630_arithmetic_subarrays.rb)                                                          | [Link](./test/medium/test_1630_arithmetic_subarrays.rb)                                                          |
 | 1641. Count Sorted Vowel Strings                                                    | [Link](https://leetcode.com/problems/count-sorted-vowel-strings/)                                                    | [Link](./lib/medium/1641_count_sorted_vowel_strings.rb)                                                    | [Link](./test/medium/test_1641_count_sorted_vowel_strings.rb)                                                    |
 | 1669. Merge In Between Linked Lists                                                 | [Link](https://leetcode.com/problems/merge-in-between-linked-lists/)                                                 | [Link](./lib/medium/1669_merge_in_between_linked_lists.rb)                                                 | [Link](./test/medium/test_1669_merge_in_between_linked_lists.rb)                                                 |
+| 1670. Design Front Middle Back Queue                                                | [Link](https://leetcode.com/problems/design-front-middle-back-queue/)                                                | [Link](./lib/medium/1670_design_front_middle_back_queue.rb)                                                | [Link](./test/medium/test_1670_design_front_middle_back_queue.rb)                                                |
 | 2116. Check if a Parentheses String Can Be Valid                                    | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                                    | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                                    | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb)                                    |
 | 2425. Bitwise XOR of All Pairings                                                   | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                                   | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                                   | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.rb)                                                   |
 | 2429. Minimize XOR                                                                  | [Link](https://leetcode.com/problems/minimize-xor/)                                                                  | [Link](./lib/medium/2429_minimize_xor.rb)                                                                  | [Link](./test/medium/test_2429_minimize_xor.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 = '8.7.5'
+  s.version = '8.7.6'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1670_design_front_middle_back_queue.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/design-front-middle-back-queue/
+class FrontMiddleBackQueue
+  # Init
+  def initialize
+    @list = []
+  end
+
+  # @param {Integer} val
+  # @return {Void}
+  def push_front(val)
+    @list.unshift(val)
+  end
+
+  # @param {Integer} val
+  # @return {Void}
+  def push_middle(val)
+    @list.insert(@list.size / 2, val)
+  end
+
+  # @param {Integer} val
+  # @return {Void}
+  def push_back(val)
+    @list << val
+  end
+
+  # @return {Integer}
+  def pop_front
+    @list.empty? ? -1 : @list.shift
+  end
+
+  # @return {Integer}
+  def pop_middle
+    size = @list.size
+
+    return -1 if size.zero?
+
+    index = size.even? ? size / 2 - 1 : size / 2
+
+    @list.delete_at(index)
+  end
+
+  # @return {Integer}
+  def pop_back
+    @list.empty? ? -1 : @list.pop
+  end
+end

test/medium/test_1670_design_front_middle_back_queue.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1670_design_front_middle_back_queue'
+require 'minitest/autorun'
+
+class DesignFrontMiddleBackQueueTest < ::Minitest::Test
+  def test_default_one
+    front_middle_back_queue = ::FrontMiddleBackQueue.new
+    front_middle_back_queue.push_front(1)
+    front_middle_back_queue.push_back(2)
+    front_middle_back_queue.push_middle(3)
+    front_middle_back_queue.push_middle(4)
+
+    assert_equal(1, front_middle_back_queue.pop_front)
+    assert_equal(3, front_middle_back_queue.pop_middle)
+    assert_equal(4, front_middle_back_queue.pop_middle)
+    assert_equal(2, front_middle_back_queue.pop_back)
+    assert_equal(-1, front_middle_back_queue.pop_front)
+  end
+end