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38 lines
878 B
Ruby
38 lines
878 B
Ruby
=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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# 初始化佇列
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# Ruby 內建的佇列（Thread::Queue) 沒有 peek 和走訪方法，可以把 Array 當作佇列來使用
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queue = []
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# 元素入列
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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 "佇列 queue = #{queue}"
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# 訪問佇列元素
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peek = queue.first
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puts "佇列首元素 peek = #{peek}"
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# 元素出列
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# 清注意，由於是陣列，Array#shift 方法時間複雜度為 O(n)
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pop = queue.shift
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puts "出列元素 pop = #{pop}"
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puts "出列後 queue = #{queue}"
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# 獲取佇列的長度
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size = queue.length
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puts "佇列長度 size = #{size}"
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# 判斷佇列是否為空
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is_empty = queue.empty?
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puts "佇列是否為空 = #{is_empty}"
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end
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