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42 lines
1.2 KiB
Ruby
42 lines
1.2 KiB
Ruby
=begin
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File: deque.rb
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Created Time: 2024-04-06
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Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
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=end
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### Driver Code ###
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if __FILE__ == $0
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# 初始化双向队列
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# Ruby 没有内直的双端队列，只能把 Array 当作双端队列来使用
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deque = []
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# 元素如队
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deque << 2
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deque << 5
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deque << 4
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# 请注意，由于是数组，Array#unshift 方法的时间复杂度为 O(n)
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deque.unshift(3)
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deque.unshift(1)
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puts "双向队列 deque = #{deque}"
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# 访问元素
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peek_first = deque.first
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puts "队首元素 peek_first = #{peek_first}"
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peek_last = deque.last
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puts "队尾元素 peek_last = #{peek_last}"
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# 元素出队
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# 请注意，由于是数组， Array#shift 方法的时间复杂度为 O(n)
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pop_front = deque.shift
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puts "队首出队元素 pop_front = #{pop_front}，队首出队后 deque = #{deque}"
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pop_back = deque.pop
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puts "队尾出队元素 pop_back = #{pop_back}, 队尾出队后 deque = #{deque}"
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# 获取双向队列的长度
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size = deque.length
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puts "双向队列长度 size = #{size}"
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# 判断双向队列是否为空
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is_empty = size.zero?
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puts "双向队列是否为空 = #{is_empty}"
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end
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