Commit graph

5 commits

Author SHA1 Message Date
William Carroll
fa717e8a6f Re-implement suffix_tree function
Create a suffix tree from an input string. This implementation uses a stack to
control the flow of the program.

I expected this attempt to be easier than my first attempt, but surprisingly, it
was similarly difficult. It took me ~30-45 minutes to successfully implement
this function, and I'm still not pleased with the final result.
2020-11-19 21:12:36 +00:00
William Carroll
1088e4143d Implement a suffix tree
While it took me awhile to implement, this exercise was definitely worth
doing. I think there should be a more elegant way to construct the tree using
maybe a stack, but I couldn't find it.

All of this was part of a larger effort to search a string for a variety of
patterns. The solution is to compile the string into a suffix tree and then
search the suffix tree for each of the patterns.

I'm glad I didn't gloss over this exercise.
2020-11-19 00:35:23 +00:00
William Carroll
c0268ed31a Refactor random-choice
Prefer initializing `result` to an empty array of size `m`, which makes the
algorithm a bit more elegant.
2020-11-17 23:54:54 +00:00
William Carroll
751b5327a9 Solve algorithms dealing with randomness
Tonight I learned that random sample where each element in the sampling corpus
has an equal likelihood of being chosen is a brand of algorithms known as
"reservoir sampling".

- Implement random.shuffle(..)
- Implement random.choice(..)

Surprisingly, candidates are expected to encounter problems like this during
interviews.
2020-11-17 22:28:24 +00:00
William Carroll
92ab94943e Start working on the "Hard" problems
Firstly, implement a function that adds two arguments together... without using
the `+` operator. I need to drill this problem. Thankfully I took a Coursera
course that taught me how to make a half-adder and a full-adder, but the
recommended solution for this is a bit more difficult.
2020-11-16 17:10:57 +00:00