Merge pull request #687 from fartem/78_Subsets

2024-07-23 v. 6.2.8: added "78. Subsets"

Author: fartem

README.md

@@ -493,3 +493,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 71. Simplify Path                                           | [Link](https://leetcode.com/problems/simplify-path/)                                           | [Link](./lib/medium/71_simplify_path.rb)                                           |
 | 74. Search a 2D Matrix                                      | [Link](https://leetcode.com/problems/search-a-2d-matrix/)                                      | [Link](./lib/medium/74_search_a_2d_matrix.rb)                                      |
 | 75. Sort Colors                                             | [Link](https://leetcode.com/problems/sort-colors/)                                             | [Link](./lib/medium/75_sort_colors.rb)                                             |
+| 78. Subsets                                                 | [Link](https://leetcode.com/problems/subsets/)                                                 | [Link](./lib/medium/78_subsets.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 = '6.2.7'
+  s.version = '6.2.8'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/78_subsets.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/subsets/
+# @param {Integer[]} nums
+# @return {Integer[][]}
+def subsets(nums)
+  result = [[]]
+  nums.each do |num|
+    subsets = []
+    result.each { |subset| subsets << subset + [num] }
+    result += subsets
+  end
+
+  result
+end

test/medium/test_78_subsets.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/78_subsets'
+require 'minitest/autorun'
+
+class SubsetsTest < ::Minitest::Test
+  def test_default
+    assert_equal(
+      [[], [1], [2], [1, 2], [3], [1, 3], [2, 3], [1, 2, 3]],
+      subsets([1, 2, 3])
+    )
+    assert_equal([[], [0]], subsets([0]))
+  end
+end