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* Retranslate the complete English edition from Simplified Chinese * Polish three English explanations after reader-focused review
43 lines
1.1 KiB
Ruby
43 lines
1.1 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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# Initialize the deque
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# Ruby has no built-in deque class; use an Array as a deque
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deque = []
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# Enqueue elements
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deque << 2
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deque << 5
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deque << 4
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# Front insertion in a simple array takes O(n); Ruby implementations can optimize Array#unshift
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deque.unshift(3)
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deque.unshift(1)
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puts "Deque deque = #{deque}"
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# Access an element
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peek_first = deque.first
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puts "Front element peek_first = #{peek_first}"
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peek_last = deque.last
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puts "Rear element peek_last = #{peek_last}"
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# Dequeue an element
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# Front removal in a simple array takes O(n); Ruby implementations can optimize Array#shift
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pop_front = deque.shift
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puts "Element dequeued from the front: pop_front = #{pop_front}; deque = #{deque}"
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pop_back = deque.pop
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puts "Element dequeued from the rear: pop_back = #{pop_back}; deque = #{deque}"
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# Get the deque size
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size = deque.length
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puts "Deque size = #{size}"
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# Check whether the deque is empty
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is_empty = size.zero?
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puts "Is the deque empty? #{is_empty}"
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end
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