By J. M. Robson
Communications of the ACM,
June 1977,
Vol. 20 No. 6, Pages 431-433
10.1145/359605.359628
Comments
A new algorithm is presented which copies cyclic list structures using bounded workspace and linear time. Unlike a previous similar algorithm, this one makes no assumptions about the storage allocation system in use and uses only operations likely to be available in a high-level language. The distinctive feature of this algorithm is a technique for traversing the structure twice, using the same spanning tree in each case, first from left to right and then from right to left.
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