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Deteting Circular Linked List
Can you tell me how to check whether a linked list is circular?
✍: Guest
Create two pointers, and set both to the start of the list. Update each as follows:
while (pointer1) { pointer1 = pointer1->next; pointer2 = pointer2->next; if (pointer2) pointer2=pointer2->next; if (pointer1 == pointer2) { print ("circularn"); } }
If a list is circular, at some point pointer2 will wrap around and be either at the item just before pointer1, or the item before that. Either way, it's either 1 or 2 jumps until they meet.
2007-02-26, 7416👍, 0💬
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