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The Computer Journal 1984 27(2):176-177; doi:10.1093/comjnl/27.2.176
© 1984 by British Computer Society
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On Two Problems Reducible to Topological Sorting

A. D. Kalvin1 * and Y. L. Varol2 §

1 17 Caledon Road, Emmarentia Ext, Johannesburg, South Africa, 2 Department of Computer Science, Southern Illinois University, Carbondale, USA

Generating permutations satisfying a U-D sequence, or having a given number of runs are shown to be restricted permutation problems which can be reduced to topological sorting. Algorithms for generating the solution sets of such problems are outlined.

Received February 1983.

* 17 Caledon Road, Emmarentia Ext, 2195 Johannesburg, South Africa

§ Department of Computer Science, Southern Illinois University, Carbondale, Illinois 62901, USA


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