2024-12-20 v. 7.4.2: added "669. Trim a Binary Search Tree"

Author: fartem

README.md

@@ -606,3 +606,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 654. Maximum Binary Tree                                        | [Link](https://leetcode.com/problems/maximum-binary-tree/)                                        | [Link](./lib/medium/654_maximum_binary_tree.rb)                                        | [Link](./test/medium/test_654_maximum_binary_tree.rb)                                        |
 | 659. Split Array into Consecutive Subsequences                  | [Link](https://leetcode.com/problems/split-array-into-consecutive-subsequences/)                  | [Link](./lib/medium/659_split_array_into_consecutive_subsequences.rb)                  | [Link](./test/medium/test_659_split_array_into_consecutive_subsequences.rb)                  |
 | 662. Maximum Width of Binary Tree                               | [Link](https://leetcode.com/problems/maximum-width-of-binary-tree/)                               | [Link](./lib/medium/662_maximum_width_of_binary_tree.rb)                               | [Link](./test/medium/test_662_maximum_width_of_binary_tree.rb)                               |
+| 669. Trim a Binary Search Tree                                  | [Link](https://leetcode.com/problems/trim-a-binary-search-tree/)                                  | [Link](./lib/medium/669_trim_a_binary_search_tree.rb)                                  | [Link](./test/medium/test_669_trim_a_binary_search_tree.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 = '7.4.1'
+  s.version = '7.4.2'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/669_trim_a_binary_search_tree.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/trim-a-binary-search-tree/
+# @param {TreeNode} root
+# @param {Integer} low
+# @param {Integer} high
+# @return {TreeNode}
+def trim_bst(root, low, high)
+  return unless root
+
+  return trim_bst(root.left, low, high) if root.val > high
+
+  return trim_bst(root.right, low, high) if root.val < low
+
+  root.left = trim_bst(root.left, low, high)
+  root.right = trim_bst(root.right, low, high)
+
+  root
+end

test/medium/test_669_trim_a_binary_search_tree.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/medium/669_trim_a_binary_search_tree'
+require 'minitest/autorun'
+
+class TrimABinarySearchTreeTest < ::Minitest::Test
+  def test_default_one
+    assert(
+      ::TreeNode.are_equals(
+        ::TreeNode.new(
+          1,
+          nil,
+          ::TreeNode.new(2)
+        ),
+        trim_bst(
+          ::TreeNode.new(
+            1,
+            ::TreeNode.new(0),
+            ::TreeNode.new(2)
+          ),
+          1,
+          2
+        )
+      )
+    )
+  end
+
+  def test_default_two
+    assert(
+      ::TreeNode.are_equals(
+        ::TreeNode.new(
+          3,
+          ::TreeNode.new(
+            2,
+            ::TreeNode.new(1),
+            nil
+          ),
+          nil
+        ),
+        trim_bst(
+          ::TreeNode.new(
+            3,
+            ::TreeNode.new(
+              0,
+              nil,
+              ::TreeNode.new(
+                2,
+                ::TreeNode.new(1),
+                nil
+              )
+            ),
+            ::TreeNode.new(4)
+          ),
+          1,
+          3
+        )
+      )
+    )
+  end
+end