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| author | Shinya Sato <shinnya.sato@gmail.com> | 2024-03-05 18:19:27 +0900 |
|---|---|---|
| committer | Shinya Sato <shinnya.sato@gmail.com> | 2024-03-05 18:19:27 +0900 |
| commit | 49960d8950d001a372a0abde670a66ee60026957 (patch) | |
| tree | adad1d5fe428bf0bea151f71ed114223fc246bca /sample/sort/qsort.in | |
| parent | 0cf73da9ad035089c66d21021a656e4606796c47 (diff) | |
| download | inpla-49960d8950d001a372a0abde670a66ee60026957.tar.gz inpla-49960d8950d001a372a0abde670a66ee60026957.zip | |
v0.12.0
Diffstat (limited to 'sample/sort/qsort.in')
| -rw-r--r-- | sample/sort/qsort.in | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sample/sort/qsort.in b/sample/sort/qsort.in new file mode 100644 index 0000000..523d7d8 --- /dev/null +++ b/sample/sort/qsort.in @@ -0,0 +1,19 @@ +// Quick sort + +// Rules +qsort(ret) >< [] => ret~[]; +qsort(ret) >< (int x):xs => + Append(ret, x:right)~left, part(smaller, larger, x)~xs, + qsort(left)~smaller, qsort(right)~larger; + +// Note: `Append' is implemented as the following built-in agent: +// Append(ret, b)~a --> ret ~ (a++b) + +part(smaller, larger, int x) >< [] => smaller~[], larger~[]; +part(smaller, larger, int x) >< (int y):ys +| y<x => smaller~(y:cnt), part(cnt, larger, x)~ys +| _ => larger~(y:cnt), part(smaller, cnt, x)~ys; + +// Nets +qsort(ret)~[3,6,1,9,2]; +ret;
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