If A xor B = C, then C xor A = B and C xor B = A You can use these formulae to implement this ...
On 12/23/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
I'm reading MIT's book "Introduction to Algorithms". The following is one of the excercises from it: < 10.2-8 Explain how to implement doubly linked lists using only one pointer value np[x] per item instead of the usual two (next and prev). Assume that all pointer values can be interpreted as k-bit integers, and define np[x] to be np[x] = next[x] XOR prev[x], the k-bit "exclusive-or" of next[x] and prev[x]. (The value NIL is represented by 0.) Be sure to describe what information is needed to access the head of the list. Show how to implement the SEARCH, INSERT, and DELETE operations on such a list. Also show how to reverse such a list in O(1) time. /> Could anybody tell me how to solve it? Thank you!!! >
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