LeetCode 142 | Linked List Cycle II #100daysofcoding #leetcodechallenge #javaprogramming

To detects the start of a cycle in a singly linked list:
It uses two pointers, `fast` and `slow`, where `fast` moves twice as fast as `slow`. When they meet, it confirms a cycle exists. To find the cycle's start, a new pointer `p1` is set to the head, while `p2` starts from where `slow` met `fast`. Both pointers move one step at a time until they meet, indicating the start of the cycle. If no cycle is detected, the function returns `null`.

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