2023-01-25 v. 1.2.9: added "657. Robot Return to Origin"

README.md

@@ -134,3 +134,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 643. Maximum Average Subarray I                        | [Link](https://leetcode.com/problems/maximum-average-subarray-i/)                         | [Link](./lib/easy/643_maximum_average_subarray_i.rb)                        |
 | 645. Set Mismatch                                      | [Link](https://leetcode.com/problems/set-mismatch/)                                       | [Link](./lib/easy/645_set_mismatch.rb)                                      |
 | 653. Two Sum IV - Input is a BST                       | [Link](https://leetcode.com/problems/two-sum-iv-input-is-a-bst/)                          | [Link](./lib/easy/653_two_sum_iv_input_is_a_bst.rb)                         |
+| 657. Robot Return to Origin                            | [Link](https://leetcode.com/problems/robot-return-to-origin/)                             | [Link](./lib/easy/657_robot_return_to_origin.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 = '1.2.8'
+  s.version = '1.2.9'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'

lib/easy/657_robot_return_to_origin.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/robot-return-to-origin/
+# @param {String} moves
+# @return {Boolean}
+def judge_circle(moves)
+  hor = 0
+  vert = 0
+  (0..moves.length).each do |i|
+    case moves[i]
+    when 'U'
+      vert += 1
+    when 'D'
+      vert -= 1
+    when 'L'
+      hor += 1
+    when 'R'
+      hor -= 1
+    end
+  end
+
+  hor.zero? && vert.zero?
+end

test/easy/test_657_robot_return_to_origin.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/657_robot_return_to_origin'
+require 'minitest/autorun'
+
+class RobotReturnToOriginTest < ::Minitest::Test
+  def test_default
+    assert(judge_circle('UD'))
+    assert(!judge_circle('LL'))
+  end
+
+  def test_additional
+    assert(judge_circle('RL'))
+  end
+end