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=begin
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File: queue.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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# 初始化队列
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# Ruby 内置的队列（Thread::Queue) 没有 peek 和遍历方法，可以把 Array 当作队列来使用
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queue = []
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# 元素入队
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queue.push(1)
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queue.push(3)
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queue.push(2)
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queue.push(5)
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queue.push(4)
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puts "队列 queue = #{queue}"
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# 访问队列元素
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peek = queue.first
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puts "队首元素 peek = #{peek}"
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# 元素出队
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# 清注意，由于是数组，Array#shift 方法时间复杂度为 O(n)
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pop = queue.shift
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puts "出队元素 pop = #{pop}"
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puts "出队后 queue = #{queue}"
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# 获取队列的长度
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size = queue.length
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puts "队列长度 size = #{size}"
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# 判断队列是否为空
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is_empty = queue.empty?
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puts "队列是否为空 = #{is_empty}"
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end
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