2024-07-23 v. 6.2.7: added "75. Sort Colors"

README.md

@@ -492,3 +492,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 62. Unique Paths                                            | [Link](https://leetcode.com/problems/unique-paths/)                                            | [Link](./lib/medium/62_unique_paths.rb)                                            |
 | 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)                                             |

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 = '6.2.6'
+  s.version = '6.2.7'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/75_sort_colors.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/sort-colors/
+# @param {Integer[]} nums
+# @return {Void} Do not return anything, modify nums in-place instead.
+def sort_colors(nums)
+  l = 0
+  m = 0
+  h = nums.length - 1
+
+  while m <= h
+    if nums[m].zero?
+      swap(nums, m, l)
+      m += 1
+      l += 1
+    elsif nums[m] == 1
+      m += 1
+    else
+      swap(nums, m, h)
+      h -= 1
+    end
+  end
+end
+
+private
+
+# @param {Integer[]} nums
+# @param {Integer} f
+# @param {Integer} s
+# @return {Void}
+def swap(nums, f, s)
+  temp = nums[f]
+  nums[f] = nums[s]
+  nums[s] = temp
+end

test/medium/test_75_sort_colors.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/75_sort_colors'
+require 'minitest/autorun'
+
+class SortColorsTest < ::Minitest::Test
+  def test_default
+    nums = [2, 0, 2, 1, 1, 0]
+    sort_colors(nums)
+    assert_equal([0, 0, 1, 1, 2, 2], nums)
+
+    nums = [2, 0, 1]
+    sort_colors(nums)
+    assert_equal([0, 1, 2], nums)
+  end
+end