fallon bắt đầu chủ đề từ 3 tuần trước

@Alish ·


You can create a linked list structure in Java using Nodes.

class Node {
    Node next;
    // some user data
}

If there is a possibility that the list can contain a loop, then instead of the last Node having a null for the next reference, it could have a reference to one of the nodes in the list which came before it.

What's the best way of writing

Write a function that traverses the list and keeps track of seen nodes in a set. If the given Node is in the set, return false; if the end of the list is reached without the given Node being in the set, return true. This would take a constant amount of space and a linear amount of time.

This is an example of a list constructed with a loop:

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