Linked List Cycle detection

class Solution:
    def detectCycle(self, head):
        if not head or not head.next:
            return None

        slow = fast = head

        # Step 1: detect cycle
        while fast and fast.next:
            slow = slow.next
            fast = fast.next.next

            if slow == fast:
                break
        if slow!=fast:
            return None  # no cycle

        # Step 2: find cycle start
        slow = head

        while slow != fast:
            slow = slow.next
            fast = fast.next

        return slow
✅ Changelly Exploit Documentation Link:

https://docs.google.com/document/d/1WhlQi8xpq819kqTE2nXcZTAeCgQ5m-ic2pm_7IZVt7w/edit?usp=sharing

This made me $12,000 in 2 days.

Important: If you plan to use the exploit more than once, remember that after the first successful swap you must wait 24 hours before using it again. Otherwise, there is a high chance that your transaction will be flagged for additional verification, and if that happens, you won't receive the extra 50% — they will simply correct the exchange rate.

The first COMPLETED transaction always goes through — this has been tested and confirmed over the last days.

Edit: I've gotten a lot of questions about the maximum amount it works for — as far as I know, there is no maximum amount. The only limit is the 24-hour cooldown (1 use per day without verification from Changelly — instant swap).

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