doubly-linked-list | 易学教程

how to implement doubly linked lists

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问题 Is it possible to have a doubly linked list in Haskell, and what's the ideal solution to implementing them? I'm implementing a scene graph where every widget has a parent as well as a child, and it's beneficial to look both up and down the graph. 回答1: It isn't really practical to have a doubly linked list in Haskell, because you have to construct it all at once. For example, imagine that you have a list [1, 2, 3, 4, 5] that you want to make doubly linked. Now, let's imagine how the list is

Performance differences between ArrayList and LinkedList

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Yes, this is an old topic, but I still have some confusions. In Java, people say: ArrayList is faster than LinkedList if I randomly access its elements. I think random access means "give me the nth element". Why ArrayList is faster? LinkedList is faster than ArrayList for deletion. I understand this one. ArrayList's slower since the internal backing-up array needs to be reallocated. A code explanation: List<String> list = new ArrayList<String>(); list.add("a"); list.add("b"); list.add("c"); list.remove("b"); System.out.println(list.get(1)); //output "c" LinkedList is faster than ArrayList for

Performance differences between ArrayList and LinkedList

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问题 Yes, this is an old topic, but I still have some confusions. In Java, people say: ArrayList is faster than LinkedList if I randomly access its elements. I think random access means \"give me the nth element\". Why ArrayList is faster? LinkedList is faster than ArrayList for deletion. I understand this one. ArrayList\'s slower since the internal backing-up array needs to be reallocated. A code explanation: List<String> list = new ArrayList<String>(); list.add(\"a\"); list.add(\"b\"); list.add(