2024-07-22 v. 6.2.5: added "71. Simplify Path"

Author: fartem

README.md

@@ -490,3 +490,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 59. Spiral Matrix II                                        | [Link](https://leetcode.com/problems/spiral-matrix-ii/)                                        | [Link](./lib/medium/59_spiral_matrix_ii.rb)                                        |
 | 61. Rotate List                                             | [Link](https://leetcode.com/problems/rotate-list/)                                             | [Link](./lib/medium/61_rotate_list.rb)                                             |
 | 62. Unique Paths                                            | [Link](https://leetcode.com/problems/unique-paths/)                                            | [Link](./lib/medium/62_unique_paths.rb)                                            |
+| 71. Simplify Path                                           | [Link](https://leetcode.com/problems/simplify-path/)                                           | [Link](./lib/medium/71_simplify_path.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 = '6.2.4'
+  s.version = '6.2.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/71_simplify_path.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/simplify-path/
+# @param {String} path
+# @return {String}
+def simplify_path(path)
+  stack = []
+  s = path.split('/')
+
+  s.each do |str|
+    if str == '..'
+      stack.pop unless stack.empty?
+    elsif str != '.' && !str.empty? && str != '..'
+      stack << "/#{str}"
+    end
+  end
+
+  return '/' if stack.empty?
+
+  stack.join
+end

test/medium/test_71_simplify_path.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/71_simplify_path'
+require 'minitest/autorun'
+
+class SimplifyPathTest < ::Minitest::Test
+  def test_default
+    assert_equal('/home', simplify_path('/home/'))
+    assert_equal('/home/foo', simplify_path('/home//foo/'))
+    assert_equal('/home/user/Pictures', simplify_path('/home/user/Documents/../Pictures'))
+    assert_equal('/', simplify_path('/../'))
+    assert_equal('/.../b/d', simplify_path('/.../a/../b/c/../d/./'))
+  end
+end