2024-12-30 v. 7.5.5: added "763. Partition Labels"

Author: fartem

README.md

@@ -619,3 +619,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 729. My Calendar I                                              | [Link](https://leetcode.com/problems/my-calendar-i/)                                              | [Link](./lib/medium/729_my_calendar_i.rb)                                              | [Link](./test/medium/test_729_my_calendar_i.rb)                                              |
 | 735. Asteroid Collision                                         | [Link](https://leetcode.com/problems/asteroid-collision/)                                         | [Link](./lib/medium/735_asteroid_collision.rb)                                         | [Link](./test/medium/test_735_asteroid_collision.rb)                                         |
 | 739. Daily Temperatures                                         | [Link](https://leetcode.com/problems/daily-temperatures/)                                         | [Link](./lib/medium/739_daily_temperatures.rb)                                         | [Link](./test/medium/test_739_daily_temperatures.rb)                                         |
+| 763. Partition Labels                                           | [Link](https://leetcode.com/problems/partition-labels/)                                           | [Link](./lib/medium/763_partition_labels.rb)                                           | [Link](./test/medium/test_763_partition_labels.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 = '7.5.4'
+  s.version = '7.5.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/763_partition_labels.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/partition-labels/
+# @param {String} s
+# @return {Integer[]}
+def partition_labels(s)
+  last = ::Array.new(128, 0)
+  (0...s.size).each { |i| last[s[i].ord] = i }
+
+  j = 0
+  anchor = 0
+  result = []
+  (0...s.size).each do |i|
+    j = [j, last[s[i].ord]].max
+
+    next unless i == j
+
+    result << i - anchor + 1
+    anchor = i + 1
+  end
+
+  result
+end

test/medium/test_763_partition_labels.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/763_partition_labels'
+require 'minitest/autorun'
+
+class PartitionLabelsTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      [9, 7, 8],
+      partition_labels(
+        'ababcbacadefegdehijhklij'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      [10],
+      partition_labels(
+        'eccbbbbdec'
+      )
+    )
+  end
+end