2025-01-11 v. 7.9.0: added "1400. Construct K Palindrome Strings"

Author: fartem

README.md

@@ -638,6 +638,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 894. All Possible Full Binary Trees                              | [Link](https://leetcode.com/problems/all-possible-full-binary-trees/)                              | [Link](./lib/medium/894_all_possible_full_binary_trees.rb)                              | [Link](./test/medium/test_894_all_possible_full_binary_trees.rb)                              |
 | 901. Online Stock Span                                           | [Link](https://leetcode.com/problems/online-stock-span/)                                           | [Link](./lib/medium/901_online_stock_span.rb)                                           | [Link](./test/medium/test_901_online_stock_span.rb)                                           |
 | 916. Word Subsets                                                | [Link](https://leetcode.com/problems/word-subsets/)                                                | [Link](./lib/medium/916_word_subsets.rb)                                                | [Link](./test/medium/test_916_word_subsets.rb)                                                |
+| 1400. Construct K Palindrome Strings                             | [Link](https://leetcode.com/problems/construct-k-palindrome-strings/)                              | [Link](./lib/medium/1400_construct_k_palindrome_strings.rb)                             | [Link](./test/medium/test_1400_construct_k_palindrome_strings.rb)                             |
 
 ### Hard
 

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 = '7.8.9'
+  s.version = '7.9.0'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1400_construct_k_palindrome_strings.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/construct-k-palindrome-strings/
+# @param {String} s
+# @param {Integer} k
+# @return {Boolean}
+def can_construct_k_palindrome(s, k)
+  return false if s.size < k
+
+  chars = s.chars.sort
+  odd_count = 0
+  i = 0
+
+  while i < chars.size
+    current = chars[i]
+    count = 0
+
+    while i < chars.size && chars[i] == current
+      count += 1
+      i += 1
+    end
+
+    odd_count += 1 if count.odd?
+  end
+
+  odd_count <= k
+end

test/medium/test_1400_construct_k_palindrome_strings.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1400_construct_k_palindrome_strings'
+require 'minitest/autorun'
+
+class ConstructKPalindromeStringsTest < ::Minitest::Test
+  def test_default_one = assert(can_construct_k_palindrome('annabelle', 2))
+
+  def test_default_two = assert(!can_construct_k_palindrome('leetcode', 3))
+
+  def test_default_three = assert(can_construct_k_palindrome('true', 4))
+end