2024-09-05 v. 6.6.3: added "179. Largest Number"

Author: fartem

README.md

@@ -528,3 +528,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 165. Compare Version Numbers                                    | [Link](https://leetcode.com/problems/compare-version-numbers/)                                    | [Link](./lib/medium/165_compare_version_numbers.rb)                                    | [Link](./test/medium/test_165_compare_version_numbers.rb)                                    |
 | 167. Two Sum II - Input Array Is Sorted                         | [Link](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/)                           | [Link](./lib/medium/167_two_sum_ii_input_array_is_sorted.rb)                           | [Link](./test/medium/test_167_two_sum_ii_input_array_is_sorted.rb)                           |
 | 173. Binary Search Tree Iterator                                | [Link](https://leetcode.com/problems/binary-search-tree-iterator/)                                | [Link](./lib/medium/173_binary_search_tree_iterator.rb)                                | [Link](./test/medium/test_173_binary_search_tree_iterator.rb)                                |
+| 179. Largest Number                                             | [Link](https://leetcode.com/problems/largest-number/)                                             | [Link](./lib/medium/179_largest_number.rb)                                             | [Link](./test/medium/test_179_largest_number.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 = '6.6.2'
+  s.version = '6.6.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/179_largest_number.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/largest-number/
+# @param {Integer[]} nums
+# @return {String}
+def largest_number(nums)
+  values = nums.map(&:to_s).sort! { |o1, o2| (o2 + o1) <=> (o1 + o2) }
+
+  return '0' if values.first == '0'
+
+  values.join
+end

test/medium/test_179_largest_number.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/179_largest_number'
+require 'minitest/autorun'
+
+class LargestNumberTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      '210',
+      largest_number(
+        [10, 2]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      '9534330',
+      largest_number(
+        [3, 30, 34, 5, 9]
+      )
+    )
+  end
+end