Bug fixes and improvements (#1298)

* Fix is_empty() implementation in the stack and queue chapter

* Update en/CONTRIBUTING.md

* Remove "剩余" from the state definition of knapsack problem

* Sync zh and zh-hant versions

* Update the stylesheets of code tabs

* Fix quick_sort.rb

* Fix TS code

* Update chapter_paperbook

* Upload the manuscript of 0.1 section

* Fix binary_tree_dfs.rb

* Bug fixes

* Update README

* Update README

* Update README

* Update README.md

* Update README

* Sync zh and zh-hant versions

* Bug fixes

zh-hant/codes/ruby/chapter_hashing/hash_map.rb

@@ -0,0 +1,44 @@
+=begin
+File: hash_map.rb
+Created Time: 2024-04-14
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+require_relative '../utils/print_util'
+
+### Driver Code ###
+if __FILE__ == $0
+  # 初始化雜湊表
+  hmap = {}
+
+  # 新增操作
+  # 在雜湊表中新增鍵值對 (key, value)
+  hmap[12836] = "小哈"
+  hmap[15937] = "小囉"
+  hmap[16750] = "小算"
+  hmap[13276] = "小法"
+  hmap[10583] = "小鴨"
+  puts "\n新增完成後，雜湊表為\nKey -> Value"
+  print_hash_map(hmap)
+
+  # 查詢操作
+  # 向雜湊表中輸入鍵 key ，得到值 value
+  name = hmap[15937]
+  puts "\n輸入學號 15937 ，查詢到姓名 #{name}"
+
+  # 刪除操作
+  # 在雜湊表中刪除鍵值對 (key, value)
+  hmap.delete(10583)
+  puts "\n刪除 10583 後，雜湊表為\nKey -> Value"
+  print_hash_map(hmap)
+
+  # 走訪雜湊表
+  puts "\n走訪鍵值對 Key->Value"
+  hmap.entries.each { |key, value| puts "#{key} -> #{value}" }
+
+  puts "\n單獨走訪鍵 Key"
+  hmap.keys.each { |key| puts key }
+
+  puts "\n單獨走訪值 Value"
+  hmap.values.each { |val| puts val }
+end