mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-27 05:46:28 +08:00
41 lines
1.1 KiB
Ruby
41 lines
1.1 KiB
Ruby
=begin
|
||
File: deque.rb
|
||
Created Time: 2024-04-06
|
||
Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
|
||
=end
|
||
|
||
### Driver Code ###
|
||
|
||
# 初始化双向队列
|
||
# Ruby 没有内直的双端队列，只能把 Array 当作双端队列来使用
|
||
deque = []
|
||
|
||
# 元素如队
|
||
deque << 2
|
||
deque << 5
|
||
deque << 4
|
||
# 请注意，由于是数组，Array#unshift 方法的时间复杂度为 O(n)
|
||
deque.unshift(3)
|
||
deque.unshift(1)
|
||
puts "双向队列 deque = #{deque}"
|
||
|
||
# 访问元素
|
||
peek_first = deque.first
|
||
puts "队首元素 peek_first = #{peek_first}"
|
||
peek_last = deque.last
|
||
puts "队尾元素 peek_last = #{peek_last}"
|
||
|
||
# 元素出队
|
||
# 请注意，由于是数组， Array#shift 方法的时间复杂度为 O(n)
|
||
pop_front = deque.shift
|
||
puts "队首出队元素 pop_front = #{pop_front}，队首出队后 deque = #{deque}"
|
||
pop_back = deque.pop
|
||
puts "队尾出队元素 pop_back = #{pop_back}, 队尾出队后 deque = #{deque}"
|
||
|
||
# 获取双向队列的长度
|
||
size = deque.length
|
||
puts "双向队列长度 size = #{size}"
|
||
|
||
# 判断双向队列是否为空
|
||
is_empty = size.zero?
|
||
puts "双向队列是否为空 = #{is_empty}"
|