2025-01-14 v. 8.0.6: added "1944. Number of Visible People in a Queue"

Author: fartem

README.md

@@ -675,3 +675,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1106. Parsing A Boolean Expression                            | [Link](https://leetcode.com/problems/parsing-a-boolean-expression/)                            | [Link](./lib/hard/1106_parsing_a_boolean_expression.rb)                            | [Link](./test/hard/test_1106_parsing_a_boolean_expression.rb)                            |
 | 1220. Count Vowels Permutation                                | [Link](https://leetcode.com/problems/count-vowels-permutation/)                                | [Link](./lib/hard/1220_count_vowels_permutation.rb)                                | [Link](./test/hard/test_1220_count_vowels_permutation.rb)                                |
 | 1770. Maximum Score from Performing Multiplication Operations | [Link](https://leetcode.com/problems/maximum-score-from-performing-multiplication-operations/) | [Link](./lib/hard/1770_maximum_score_from_performing_multiplication_operations.rb) | [Link](./test/hard/test_1770_maximum_score_from_performing_multiplication_operations.rb) |
+| 1944. Number of Visible People in a Queue                     | [Link](https://leetcode.com/problems/number-of-visible-people-in-a-queue/)                     | [Link](./lib/hard/1944_number_of_visible_people_in_a_queue.rb)                     | [Link](./test/hard/test_1944_number_of_visible_people_in_a_queue.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 = '8.0.5'
+  s.version = '8.0.6'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/hard/1944_number_of_visible_people_in_a_queue.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: false
+
+# https://leetcode.com/problems/number-of-visible-people-in-a-queue/
+# @param {Integer[]} heights
+# @return {Integer[]}
+def can_see_persons_count(heights)
+  length = heights.length
+  stack = []
+  result = ::Array.new(length, 0)
+
+  (length - 1).downto(0) do |i|
+    count = 0
+    curr = heights[i]
+
+    while !stack.empty? && stack.last < curr
+      count += 1
+      stack.pop
+    end
+
+    result[i] = count + (stack.empty? ? 0 : 1)
+
+    stack << curr
+  end
+
+  result
+end

test/hard/test_1944_number_of_visible_people_in_a_queue.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: false
+
+require_relative '../test_helper'
+require_relative '../../lib/hard/1944_number_of_visible_people_in_a_queue'
+require 'minitest/autorun'
+
+class NumberOfVisiblePeopleInAQueueTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      [3, 1, 2, 1, 1, 0],
+      can_see_persons_count(
+        [10, 6, 8, 5, 11, 9]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      [4, 1, 1, 1, 0],
+      can_see_persons_count(
+        [5, 1, 2, 3, 10]
+      )
+    )
+  end
+end