Linked List Cycle III

This question is the same as Linked List Cycle, except in addition to checking whether a linked list has a loop, we also find the entry point to the loop, if possible.

Parameters

  • nodes: The first node of a linked list with potentially a loop.

Result

  • An integer representing the value contained by the entry point to the loop, if there is one. If there is no loop, output -1.

Examples

Example 1

Input:

Output:

1

Example 2

Input:

Output:

-1

Constraints

  • 1 <= len(nodes) <= 10^5

Try it yourself

Solution

Title

Script

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  >>> a = [1, 2, 3]
  >>> a[-1]
  3

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