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author | Vincent Ambo <mail@tazj.in> | 2021-12-13T22·51+0300 |
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committer | Vincent Ambo <mail@tazj.in> | 2021-12-13T23·15+0300 |
commit | 019f8fd2113df4c5247c3969c60fd4f0e08f91f7 (patch) | |
tree | 76a857f61aa88f62a30e854651e8439db77fd0ea /users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py | |
parent | 464bbcb15c09813172c79820bcf526bb10cf4208 (diff) | |
parent | 6123e976928ca3d8d93f0b2006b10b5f659eb74d (diff) |
subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226
git-subtree-dir: users/wpcarro git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208 git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f Change-Id: I6105b3762b79126b3488359c95978cadb3efa789
Diffstat (limited to 'users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py')
-rw-r--r-- | users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py b/users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py new file mode 100644 index 000000000000..6dbe0fa0f3c3 --- /dev/null +++ b/users/wpcarro/scratch/data_structures_and_algorithms/merge-sort.py @@ -0,0 +1,28 @@ + + + +# merge :: [a] -> [a] -> [a] +# merge([], []): [] +# merge(xs, []): xs +# merge([], ys): ys +# merge(xs@[x|xs'], ys@[y|ys']) +# when y =< x: cons(y, merge(xs, ys')) +# when x < y: cons(x, merge(xs', ys)) +def merge(xs, ys): + if xs == [] and ys == []: + return [] + elif ys == []: + return xs + elif xs == []: + return ys + else: + x = xs[0] + y = ys[0] + + if y <= x: + return [y] + merge(xs, ys[1:]) + else: + return [x] + merge(xs[1:], ys) + +print(merge([3, 4, 6, 10, 11, 15], + [1, 5, 8, 12, 14, 19])) |