Grokking the Coding Interview: Patterns for Coding Questions
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LinkedList Cycle (easy)
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Problem Statement

Given the head of a Singly LinkedList, write a function to determine if the LinkedList has a cycle in it or not.

Constraints:

  • The number of the nodes in the list is in the range [0, 10<sup>4</sup>].
  • -10<sup>5</sup> <= Node.val <= 10<sup>5</sup>

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