2023-01-28 v. 1.3.2: added "680. Valid Palindrome II"

README.md

@@ -137,3 +137,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 657. Robot Return to Origin                            | [Link](https://leetcode.com/problems/robot-return-to-origin/)                             | [Link](./lib/easy/657_robot_return_to_origin.rb)                            |
 | 671. Second Minimum Node In a Binary Tree              | [Link](https://leetcode.com/problems/second-minimum-node-in-a-binary-tree/)               | [Link](./lib/easy/671_second_minimum_node_in_a_binary_tree.rb)              |
 | 674. Longest Continuous Increasing Subsequence         | [Link](https://leetcode.com/problems/longest-continuous-increasing-subsequence/)          | [Link](./lib/easy/674_longest_continuous_increasing_subsequence.rb)         |
+| 680. Valid Palindrome II                               | [Link](https://leetcode.com/problems/valid-palindrome-ii/)                                | [Link](./lib/easy/680_valid_palindrome_ii.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 = '1.3.1'
+  s.version = '1.3.2'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'

lib/easy/680_valid_palindrome_ii.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/valid-palindrome-ii/
+# @param {String} s
+# @return {Boolean}
+def valid_palindrome_ii(s)
+  (0...(s.length / 2)).step(1) do |i|
+    index = s.length - i - 1
+    return is_palindrome_range(s, i + 1, index) || is_palindrome_range(s, i, index - 1) if s[i] != s[index]
+  end
+
+  true
+end
+
+# @param {String} s
+# @param {Integer} i
+# @param {Integer} j
+def is_palindrome_range(s, i, j)
+  (i..(i + (j - i) / 2)).step(1) do |k|
+    return false if s[k] != s[j - k + i]
+  end
+
+  true
+end

test/easy/test_680_valid_palindrome.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/680_valid_palindrome_ii'
+require 'minitest/autorun'
+
+class ValidPalindromeIITest < ::Minitest::Test
+  def test_default
+    assert(valid_palindrome_ii('aba'))
+    assert(valid_palindrome_ii('abca'))
+    assert(!valid_palindrome_ii('abc'))
+  end
+end