2025-02-20 v. 8.6.4: added "1472. Design Browser History"

Author: fartem

README.md

@@ -697,6 +697,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1448. Count Good Nodes in Binary Tree                                               | [Link](https://leetcode.com/problems/count-good-nodes-in-binary-tree/)                                               | [Link](./lib/medium/1448_count_good_nodes_in_binary_tree.rb)                                               | [Link](./test/medium/test_1448_count_good_nodes_in_binary_tree.rb)                                               |
 | 1457. Pseudo-Palindromic Paths in a Binary Tree                                     | [Link](https://leetcode.com/problems/pseudo-palindromic-paths-in-a-binary-tree/)                                     | [Link](./lib/medium/1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     | [Link](./test/medium/test_1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     |
 | 1461. Check If a String Contains All Binary Codes of Size K                         | [Link](https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/)                         | [Link](./lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         | [Link](./test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         |
+| 1472. Design Browser History                                                        | [Link](https://leetcode.com/problems/design-browser-history/)                                                        | [Link](./lib/medium/1472_design_browser_history.rb)                                                        | [Link](./test/medium/test_1472_design_browser_history.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 = '8.6.3'
+  s.version = '8.6.4'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1472_design_browser_history.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/design-browser-history/
+class BrowserHistory
+  # @param {String} homepage
+  def initialize(homepage)
+    @history = [homepage]
+    @current = 0
+  end
+
+  # @param {String} url
+  # @return {Void}
+  def visit(url)
+    if @current < @history.size - 1
+      size = @history.size - 1
+
+      (@current...size).each { |_| @history.pop }
+    end
+
+    @history << url
+    @current += 1
+  end
+
+  # @param {Integer} steps
+  # @return {String}
+  def back(steps)
+    @current =
+      if @current < steps
+        0
+      else
+        @current - steps
+      end
+
+    @history[@current]
+  end
+
+  # @param {Integer} steps
+  # @return {String}
+  def forward(steps)
+    @current =
+      if @current + steps >= @history.size
+        @history.size - 1
+      else
+        @current + steps
+      end
+
+    @history[@current]
+  end
+end

test/medium/test_1472_design_browser_history.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1472_design_browser_history'
+require 'minitest/autorun'
+
+class DesignBrowserHistoryTest < ::Minitest::Test
+  def test_default_one
+    browser_history = ::BrowserHistory.new('leetcode.com')
+
+    browser_history.visit('google.com')
+    browser_history.visit('twitter.com')
+    browser_history.visit('youtube.com')
+
+    assert_equal('twitter.com', browser_history.back(1))
+    assert_equal('google.com', browser_history.back(1))
+    assert_equal('twitter.com', browser_history.forward(1))
+
+    browser_history.visit('linkedin.com')
+
+    assert_equal('linkedin.com', browser_history.forward(2))
+    assert_equal('google.com', browser_history.back(2))
+    assert_equal('leetcode.com', browser_history.back(7))
+  end
+end