2025-02-24 v. 8.6.8: added "1525. Number of Good Ways to Split a String"

Author: fartem

README.md

@@ -701,6 +701,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1481. Least Number of Unique Integers after K Removals                              | [Link](https://leetcode.com/problems/least-number-of-unique-integers-after-k-removals/)                              | [Link](./lib/medium/1481_least_number_of_unique_integers_after_k_removals.rb)                              | [Link](./test/medium/test_1481_least_number_of_unique_integers_after_k_removals.rb)                              |
 | 1492. The kth Factor of n                                                           | [Link](https://leetcode.com/problems/the-kth-factor-of-n/)                                                           | [Link](./lib/medium/1492_the_kth_factor_of_n.rb)                                                           | [Link](./test/medium/test_1492_the_kth_factor_of_n.rb)                                                           |
 | 1504. Count Submatrices With All Ones                                               | [Link](https://leetcode.com/problems/count-submatrices-with-all-ones/)                                               | [Link](./lib/medium/1504_count_submatrices_with_all_ones.rb)                                               | [Link](./test/medium/test_1504_count_submatrices_with_all_ones.rb)                                               |
+| 1525. Number of Good Ways to Split a String                                         | [Link](https://leetcode.com/problems/number-of-good-ways-to-split-a-string/)                                         | [Link](./lib/medium/1525_number_of_good_ways_to_split_a_string.rb)                                         | [Link](./test/medium/test_1525_number_of_good_ways_to_split_a_string.rb)                                         |
 | 2116. Check if a Parentheses String Can Be Valid                                    | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                                    | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                                    | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb)                                    |
 | 2425. Bitwise XOR of All Pairings                                                   | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                                   | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                                   | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.rb)                                                   |
 | 2429. Minimize XOR                                                                  | [Link](https://leetcode.com/problems/minimize-xor/)                                                                  | [Link](./lib/medium/2429_minimize_xor.rb)                                                                  | [Link](./test/medium/test_2429_minimize_xor.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 = '8.6.7'
+  s.version = '8.6.8'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1525_number_of_good_ways_to_split_a_string.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/number-of-good-ways-to-split-a-string/
+# @param {String} s
+# @return {Integer}
+def num_splits(s)
+  l_chars = ::Set.new
+  r_chars = ::Set.new
+  l_count = ::Array.new(s.size, 0)
+  r_count = ::Array.new(s.size, 0)
+
+  s.length.times do |i|
+    l_c = s[i]
+
+    l_chars.add(l_c) unless l_chars.include?(l_c)
+
+    l_count[i] = l_chars.size
+    r_index = s.length - i - 1
+    r_c = s[r_index]
+
+    r_chars.add(r_c) unless r_chars.include?(r_c)
+
+    r_count[r_index] = r_chars.size
+  end
+
+  result = 0
+  l_p = 0
+  r_p = 1
+
+  while l_p != s.size && r_p != s.size
+    result += 1 if l_count[l_p] == r_count[r_p]
+
+    l_p += 1
+    r_p += 1
+  end
+
+  result
+end

test/medium/test_1525_number_of_good_ways_to_split_a_string.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1525_number_of_good_ways_to_split_a_string'
+require 'minitest/autorun'
+
+class NumberOfGoodWaysToSplitAStringTest < ::Minitest::Test
+  def test_default_one = assert_equal(2, num_splits('aacaba'))
+
+  def test_default_two = assert_equal(1, num_splits('abcd'))
+end