2025-01-14 v. 8.0.3: added "1106. Parsing A Boolean Expression"

Author: fartem

README.md

@@ -672,3 +672,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 895. Maximum Frequency Stack                  | [Link](https://leetcode.com/problems/maximum-frequency-stack/)                   | [Link](./lib/hard/895_maximum_frequency_stack.rb)                  | [Link](./test/hard/test_895_maximum_frequency_stack.rb)                  |
 | 936. Stamping The Sequence                    | [Link](https://leetcode.com/problems/stamping-the-sequence/)                     | [Link](./lib/hard/936_stamping_the_sequence.rb)                    | [Link](./test/hard/test_936_stamping_the_sequence.rb)                    |
 | 968. Binary Tree Cameras                      | [Link](https://leetcode.com/problems/binary-tree-cameras/)                       | [Link](./lib/hard/968_binary_tree_cameras.rb)                      | [Link](./test/hard/test_968_binary_tree_cameras.rb)                      |
+| 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)            |

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 = '8.0.2'
+  s.version = '8.0.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/hard/1106_parsing_a_boolean_expression.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: false
+
+# https://leetcode.com/problems/parsing-a-boolean-expression/
+# @param {String} expression
+# @return {Boolean}
+def parse_bool_expr(expression) = calc_bool_expr(expression, 0, expression.size - 1)
+
+private
+
+# @param {String} e
+# @param {String} l
+# @param {String} h
+# @return {Boolean}
+def calc_bool_expr(e, l, h)
+  return e[l] == 't' if l == h
+
+  op = e[l]
+  c = 0
+  prev = l + 2
+  result = op != '|'
+
+  ((l + 1)..h).each do |i|
+    v = e[i]
+
+    case v
+    when '('
+      c += 1
+    when ')'
+      c -= 1
+    end
+
+    next unless (c == 1 && v == ',') || (c.zero? && v == ')')
+
+    next_result = calc_bool_expr(e, prev, i - 1)
+    prev = i + 1
+
+    case op
+    when '|'
+      result ||= next_result
+    when '&'
+      result &&= next_result
+    else
+      result = !next_result
+    end
+  end
+
+  result
+end

test/hard/test_1106_parsing_a_boolean_expression.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: false
+
+require_relative '../test_helper'
+require_relative '../../lib/hard/1106_parsing_a_boolean_expression'
+require 'minitest/autorun'
+
+class ParsingABooleanExpressionTest < ::Minitest::Test
+  def test_default_one = assert(!parse_bool_expr('&(|(f))'))
+
+  def test_default_two = assert(parse_bool_expr('|(f,f,f,t)'))
+
+  def test_default_three = assert(parse_bool_expr('!(&(f,t))'))
+end