What's New -  April, 2017

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April 21, 2017: Here's a Delphi demo, HeapsPermute, of an algorithm developed by J.R. Heap in 1963 which generates permutations of arbitrary data items. It is quite efficient because it swaps only 2 elements for each permutation generated. The disadvantage may be that that there is no apparent order in the generated permutations.  Search "Heap's algorithm" on Wikipedia for more information.  I plan to use the algorithm in a future "Made from scratch" puzzle solver which doesn't use the existing DFF Library.