🔮 Cycle Origin Hunt
After collision: move ptr1 to head, both move 1 step → meeting point = cycle start!
Phase 1
Detect Collision
Phase 2
Find Entry Point
Ready to hunt for cycle entry
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Step
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🔮 Floyd's Entry Point Algorithm
1. Run Floyd's cycle detection (slow/fast)
2. After collision, move ptr1 back to HEAD
3. Move both ptr1 and ptr2 by 1 step each
4. When they meet → that's the cycle entry!