From e098db34d1751946cfd9653a11ab9b908ccd6ba5 Mon Sep 17 00:00:00 2001 From: fartem Date: Wed, 1 Jan 2025 03:21:14 +0300 Subject: [PATCH 1/2] 2025-01-01 v. 7.6.1: added "10. Regular Expression Matching" --- README.md | 7 +++-- leetcode-ruby.gemspec | 2 +- lib/hard/10_regular_expression_matching.rb | 30 +++++++++++++++++++ .../test_10_regular_expression_matching.rb | 13 ++++++++ 4 files changed, 48 insertions(+), 4 deletions(-) create mode 100644 lib/hard/10_regular_expression_matching.rb create mode 100644 test/hard/test_10_regular_expression_matching.rb diff --git a/README.md b/README.md index 72baa8c1..e2d8684b 100644 --- a/README.md +++ b/README.md @@ -627,6 +627,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/). ### Hard -| Name | Link to LeetCode | Link to solution | Link to tests | -| ------------------------------ | ------------------------------------------------------------------ | --------------------------------------------------- | --------------------------------------------------------- | -| 4. Median of Two Sorted Arrays | [Link](https://leetcode.com/problems/median-of-two-sorted-arrays/) | [Link](./lib/hard/4_median_of_two_sorted_arrays.rb) | [Link](./test/hard/test_4_median_of_two_sorted_arrays.rb) | +| Name | Link to LeetCode | Link to solution | Link to tests | +| ------------------------------- | ------------------------------------------------------------------ | ---------------------------------------------------- | ---------------------------------------------------------- | +| 4. Median of Two Sorted Arrays | [Link](https://leetcode.com/problems/median-of-two-sorted-arrays/) | [Link](./lib/hard/4_median_of_two_sorted_arrays.rb) | [Link](./test/hard/test_4_median_of_two_sorted_arrays.rb) | +| 10. Regular Expression Matching | [Link](https://leetcode.com/problems/regular-expression-matching/) | [Link](./lib/hard/10_regular_expression_matching.rb) | [Link](./test/hard/test_10_regular_expression_matching.rb) | diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec index 175fd741..1cefc4e9 100644 --- a/leetcode-ruby.gemspec +++ b/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 = '7.6.0.1' + s.version = '7.6.1' s.license = 'MIT' s.files = ::Dir['lib/**/*.rb'] + %w[README.md] s.executable = 'leetcode-ruby' diff --git a/lib/hard/10_regular_expression_matching.rb b/lib/hard/10_regular_expression_matching.rb new file mode 100644 index 00000000..accbe33a --- /dev/null +++ b/lib/hard/10_regular_expression_matching.rb @@ -0,0 +1,30 @@ +# frozen_string_literal: true + +@mem = {} + +# https://leetcode.com/problems/regular-expression-matching/ +# @param {String} s +# @param {String} p +# @return {Boolean} +def is_match(s, p) + s = s.bytes + p = p.bytes + dp = ::Array.new(s.length + 1) { ::Array.new(p.length + 1, false) } + m = s.length + n = p.length + dp[m][n] = true + + (0..m).reverse_each do |i| + (n - 1).downto(0) do |j| + first = i < m && (s[i] == p[j] || p[j] == 46) + dp[i][j] = + if p[j + 1] == 42 + dp[i][j + 2] || (first && dp[i + 1][j]) + else + first && dp[i + 1][j + 1] + end + end + end + + dp[0][0] +end diff --git a/test/hard/test_10_regular_expression_matching.rb b/test/hard/test_10_regular_expression_matching.rb new file mode 100644 index 00000000..e1ee93d1 --- /dev/null +++ b/test/hard/test_10_regular_expression_matching.rb @@ -0,0 +1,13 @@ +# frozen_string_literal: true + +require_relative '../test_helper' +require_relative '../../lib/hard/10_regular_expression_matching' +require 'minitest/autorun' + +class RegularExpressionMatchingTest < ::Minitest::Test + def test_default_one = assert(!is_match('aa', 'a')) + + def test_default_two = assert(is_match('aa', 'a*')) + + def test_default_three = assert(is_match('ab', '.*')) +end From 971b2293fb5bb17bfe2447574aac15cdc2b5c5a0 Mon Sep 17 00:00:00 2001 From: fartem Date: Wed, 1 Jan 2025 03:22:48 +0300 Subject: [PATCH 2/2] 2025-01-01 v. 7.6.1: updated "10. Regular Expression Matching" --- lib/hard/10_regular_expression_matching.rb | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/hard/10_regular_expression_matching.rb b/lib/hard/10_regular_expression_matching.rb index accbe33a..4db55725 100644 --- a/lib/hard/10_regular_expression_matching.rb +++ b/lib/hard/10_regular_expression_matching.rb @@ -9,13 +9,13 @@ def is_match(s, p) s = s.bytes p = p.bytes - dp = ::Array.new(s.length + 1) { ::Array.new(p.length + 1, false) } - m = s.length - n = p.length + dp = ::Array.new(s.size + 1) { ::Array.new(p.size + 1, false) } + m = s.size + n = p.size dp[m][n] = true (0..m).reverse_each do |i| - (n - 1).downto(0) do |j| + (0...n).reverse_each do |j| first = i < m && (s[i] == p[j] || p[j] == 46) dp[i][j] = if p[j + 1] == 42