Add "Crack the Coding Interview" examples

I believe I have multiple other snippets and attempts scattered across /tmp,
~/programming, and other directories. Again, I created these files and others
before the mono-repo.
This commit is contained in:
William Carroll 2020-01-15 14:23:37 +00:00
parent 456d358cd7
commit b4ee283b23
2 changed files with 51 additions and 0 deletions

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# Implementation for a problem from "Crack the Coding Interview".
#
# Dependencies:
# - python 2.7.16
# - entr 4.1
#
# To run the tests, run: `python 11_1.py`
# For a tight development loop, run: `echo 11_1.py | entr python /_`
#
# Author: William Carroll <wpcarro@gmail.com>
################################################################################
# Implementation
################################################################################
def insert_sorted(xs, ys):
"""
Merges `ys` into `xs` and ensures that the result is sorted.
Assumptions:
- `xs` and `ys` are both sorted.
- `xs` has enough unused space to accommodate each element in `ys`.
"""
for y in ys:
xi = xs.index(None) - 1
yi = xs.index(None)
xs[yi] = y
while xi != -1 and y < xs[xi]:
xs[xi], xs[yi] = xs[yi], xs[xi]
xi, yi = xi - 1, yi - 1
return xs
################################################################################
# Tests
################################################################################
assert insert_sorted([1, 3, 5, None, None], [2, 4]) == [1, 2, 3, 4, 5]
assert insert_sorted([None, None], [2, 4]) == [2, 4]
assert insert_sorted([None, None], [2, 4]) == [2, 4]
assert insert_sorted([1, 1, None, None], [0, 0]) == [0, 0, 1, 1]
assert insert_sorted([1, 1, None, None], [1, 1]) == [1, 1, 1, 1]
print('All tests pass!')

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data Tree a = Node a [Tree a] deriving (Show)
withRoot :: [a] -> [Tree a]
withRoot xs = xs |> toThing |> fmap buildTree
buildTree :: (a, [a])
toTree :: [a] -> Tree a
toTree [x] = Node x []
toTree [x | xs] = Node x (toTree xs)