shan
cl-permutation
| shan | cl-permutation | |
|---|---|---|
| 1 | 4 | |
| 8 | 47 | |
| - | - | |
| 1.8 | 3.5 | |
| about 2 years ago | 10 months ago | |
| Clojure | Common Lisp | |
| MIT License | BSD 3-clause "New" or "Revised" License |
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shan
cl-permutation
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Permutation Iteration and Random Access
Here is Lisp code [1] that maps all sorts of combinatorial objects—permutations, bit sets, base-B integers, multi-set permutations, etc.—perfectly into the smallest set of integers [0, n-1] and back. (In a sense, it's a perfect hash.) This is used to efficiently solve combinatorial puzzles.
[1] https://github.com/stylewarning/cl-permutation/blob/master/s...
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Can a Rubik's Cube be brute-forced?
Note that in the unlikely event anyone wants to run the code in the post, the algorithm presented is still in an open PR, APIs change until merged, etc.
- Favorite Lisp project? Shameless plugs welcome & encouraged!
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Is Fisher-Yates Shuffle (aka Knuth Shuffle) implemented in some vetted CL library?
CL-PERMUTATION has random-perm to produce a random permutation of even, odd, or any parity.
What are some alternatives?
weblocks - This fork was created to experiment with some refactorings. They are collected in branch "reblocks".
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