Merge pull request #749 from fartem/300_Longest_Increasing_Subsequence

2024-10-16 v. 6.8.2: added "300. Longest Increasing Subsequence"

README.md

@@ -547,3 +547,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 284. Peeking Iterator                                           | [Link](https://leetcode.com/problems/peeking-iterator/)                                           | [Link](./lib/medium/284_peeking_iterator.rb)                                           | [Link](./test/medium/test_284_peeking_iterator.rb)                                           |
 | 287. Find the Duplicate Number                                  | [Link](https://leetcode.com/problems/find-the-duplicate-number/)                                  | [Link](./lib/medium/287_find_the_duplicate_number.rb)                                  | [Link](./test/medium/test_287_find_the_duplicate_number.rb)                                  |
 | 299. Bulls and Cows                                             | [Link](https://leetcode.com/problems/bulls-and-cows/)                                             | [Link](./lib/medium/299_bulls_and_cows.rb)                                             | [Link](./test/medium/test_299_bulls_and_cows.rb)                                             |
+| 300. Longest Increasing Subsequence                             | [Link](https://leetcode.com/problems/longest-increasing-subsequence/)                             | [Link](./lib/medium/300_longest_increasing_subsequence.rb)                             | [Link](./test/medium/test_300_longest_increasing_subsequence.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 = '6.8.1'
+  s.version = '6.8.2'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/300_longest_increasing_subsequence.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/longest-increasing-subsequence/
+# @param {Integer[]} nums
+# @return {Integer}
+def length_of_lis(nums)
+  result = []
+  nums.each do |num|
+    index = result.bsearch_index { |checked_num| checked_num >= num } || result.size
+    result[index] = num
+  end
+
+  result.size
+end

test/medium/test_300_longest_increasing_subsequence.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/300_longest_increasing_subsequence'
+require 'minitest/autorun'
+
+class LongestIncreasingSubsequenceTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      4,
+      length_of_lis(
+        [10, 9, 2, 5, 3, 7, 101, 18]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      4,
+      length_of_lis(
+        [0, 1, 0, 3, 2, 3]
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      1,
+      length_of_lis(
+        [7, 7, 7, 7, 7, 7, 7]
+      )
+    )
+  end
+end