2024-12-27 v. 7.5.3: added "735. Asteroid Collision"

Author: fartem

README.md

@@ -617,3 +617,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 720. Longest Word in Dictionary                                 | [Link](https://leetcode.com/problems/longest-word-in-dictionary/)                                 | [Link](./lib/medium/720_longest_word_in_dictionary.rb)                                 | [Link](./test/medium/test_720_longest_word_in_dictionary.rb)                                 |
 | 725. Split Linked List in Parts                                 | [Link](https://leetcode.com/problems/split-linked-list-in-parts/)                                 | [Link](./lib/medium/725_split_linked_list_in_parts.rb)                                 | [Link](./test/medium/test_725_split_linked_list_in_parts.rb)                                 |
 | 729. My Calendar I                                              | [Link](https://leetcode.com/problems/my-calendar-i/)                                              | [Link](./lib/medium/729_my_calendar_i.rb)                                              | [Link](./test/medium/test_729_my_calendar_i.rb)                                              |
+| 735. Asteroid Collision                                         | [Link](https://leetcode.com/problems/asteroid-collision/)                                         | [Link](./lib/medium/735_asteroid_collision.rb)                                         | [Link](./test/medium/test_735_asteroid_collision.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 = '7.5.2'
+  s.version = '7.5.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/735_asteroid_collision.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/asteroid-collision/
+# @param {Integer[]} asteroids
+# @return {Integer[]}
+def asteroid_collision(asteroids)
+  stack = []
+
+  asteroids.each do |asteroid|
+    stack << asteroid
+    stack.drop_asteroid! while stack.has_collision?
+  end
+
+  stack
+end
+
+# Array extension
+class Array
+  # @return {Integer}
+  def drop_asteroid!
+    return 2.times { pop } if self[-1].abs == self[-2].abs
+
+    self[-1].abs > self[-2].abs ? self[-1] = pop : pop
+  end
+
+  # @return {Boolean}
+  def has_collision?
+    return false unless length >= 2
+
+    self[-2] > self[-1] && self[-1].positive? != self[-2].positive?
+  end
+end

test/medium/test_735_asteroid_collision.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/735_asteroid_collision'
+require 'minitest/autorun'
+
+class AsteroidCollisionTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      [5, 10],
+      asteroid_collision(
+        [5, 10, -5]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      [],
+      asteroid_collision(
+        [8, -8]
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      [10],
+      asteroid_collision(
+        [10, 2, -5]
+      )
+    )
+  end
+end