Merge pull request #710 from fartem/129_Sum_Root_to_Leaf_Numbers

2024-08-15 v. 6.4.8: added "129. Sum Root to Leaf Numbers"

Author: fartem

README.md

@@ -513,3 +513,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 117. Populating Next Right Pointers in Each Node II             | [Link](https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/)             | [Link](./lib/medium/117_populating_next_right_pointers_in_each_node_ii.rb)             |
 | 120. Triangle                                                   | [Link](https://leetcode.com/problems/triangle/)                                                   | [Link](./lib/medium/120_triangle.rb)                                                   |
 | 128. Longest Consecutive Sequence                               | [Link](https://leetcode.com/problems/longest-consecutive-sequence/)                               | [Link](./lib/medium/128_longest_consecutive_sequence.rb)                               |
+| 129. Sum Root to Leaf Numbers                                   | [Link](https://leetcode.com/problems/sum-root-to-leaf-numbers/)                                   | [Link](./lib/medium/129_sum_root_to_leaf_numbers.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 = '6.4.7'
+  s.version = '6.4.8'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/129_sum_root_to_leaf_numbers.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/sum-root-to-leaf-numbers/
+# @param {TreeNode} root
+# @return {Integer}
+def sum_numbers(root)
+  sum129(root, 0)
+end
+
+private
+
+# @param {TreeNode} node
+# @param {Integer} curr
+# @return {Integer}
+def sum129(node, curr)
+  return 0 unless node
+
+  curr = curr * 10 + node.val
+
+  return curr if node.left.nil? && node.right.nil?
+
+  sum129(node.left, curr) + sum129(node.right, curr)
+end

test/medium/test_129_sum_root_to_leaf_numbers.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/medium/129_sum_root_to_leaf_numbers'
+require 'minitest/autorun'
+
+class SumRootToLeafNumbersTest < ::Minitest::Test
+  def test_default
+    assert_equal(
+      25,
+      sum_numbers(
+        ::TreeNode.new(
+          1,
+          ::TreeNode.new(2),
+          ::TreeNode.new(3)
+        )
+      )
+    )
+    assert_equal(
+      1026,
+      sum_numbers(
+        ::TreeNode.new(
+          4,
+          ::TreeNode.new(
+            9,
+            ::TreeNode.new(5),
+            ::TreeNode.new(1)
+          ),
+          ::TreeNode.new(0)
+        )
+      )
+    )
+  end
+end