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=begin
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File: print_util.rb
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Created Time: 2024-03-18
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Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
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=end
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### 打印链表 ###
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def print_linked_list(head)
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list = []
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while head
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list << head.val
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head = head.next
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end
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puts "#{list.join(" -> ")}"
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end
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