How to Fix Linked List Cycle Detection Errors

In this tutorial, you'll learn about How to Fix Linked List Cycle Detection Errors. We cover key concepts, practical examples, and best practices.

Fix linked list cycle detection errors when Floyd misses cycles or hash set memory exceeds limits.

Quick Fix

Wrong

def has_cycle(h):
    s=set(); c=h
    while c:
        if c in s: return True
        s.add(c); c=c.next
    return False

O(n) memory. Long lists exhaust heap space.

Right

def has_cycle(h):
    s=f=h
    while f and f.next:
        s=s.next; f=f.next.next
        if s is f: return True
    return False

3->2->0->-4->(back to 2) -> True. O(1) memory.

Prevention

Use Floyd's two-pointer. Move slow 1, fast 2.

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