Merge pull request #798 from fartem/556-Next-Greater-Element-III

2024-12-09 v. 7.2.7: added "556. Next Greater Element III"

Author: fartem

README.md

@@ -592,3 +592,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 524. Longest Word in Dictionary through Deleting                | [Link](https://leetcode.com/problems/longest-word-in-dictionary-through-deleting/)                | [Link](./lib/medium/524_longest_word_in_dictionary_through_deleting.rb)                | [Link](./test/medium/test_524_longest_word_in_dictionary_through_deleting.rb)                |
 | 535. Encode and Decode TinyURL                                  | [Link](https://leetcode.com/problems/encode-and-decode-tinyurl/)                                  | [Link](./lib/medium/535_encode_and_decode_tinyurl.rb)                                  | [Link](./test/medium/test_535_encode_and_decode_tinyurl.rb)                                  |
 | 538. Convert BST to Greater Tree                                | [Link](https://leetcode.com/problems/convert-bst-to-greater-tree/)                                | [Link](./lib/medium/538_convert_bst_to_greater_tree.rb)                                | [Link](./test/medium/test_538_convert_bst_to_greater_tree.rb)                                |
+| 556. Next Greater Element III                                   | [Link](https://leetcode.com/problems/next-greater-element-iii/)                                   | [Link](./lib/medium/556_next_greater_element_iii.rb)                                   | [Link](./test/medium/test_556_next_greater_element_iii.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 = '7.2.6'
+  s.version = '7.2.7'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/556_next_greater_element_iii.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/next-greater-element-iii/
+# @param {Integer} n
+# @return {Integer}
+def next_greater_element_iii(n)
+  digits = n.to_s.chars
+
+  i = digits.size - 1
+  i -= 1 while i - 1 >= 0 && digits[i] <= digits[i - 1]
+
+  return -1 if i.zero?
+
+  j = i
+  j += 1 while j + 1 < digits.size && digits[j + 1] > digits[i - 1]
+
+  digits[i - 1], digits[j] = digits[j], digits[i - 1]
+  digits[i..-1] = digits[i..].reverse
+
+  result = digits.join.to_i
+
+  result < 1 << 31 ? result : -1
+end

test/medium/test_556_next_greater_element_iii.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/556_next_greater_element_iii'
+require 'minitest/autorun'
+
+class NextGreaterElementIIITest < ::Minitest::Test
+  def test_default_one = assert_equal(21, next_greater_element_iii(12))
+
+  def test_default_two = assert_equal(-1, next_greater_element_iii(21))
+end