Leaves - Yasmin #14
Open
Leaves - Yasmin #14
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
CheezItMan
reviewed
Mar 18, 2020
There was a problem hiding this comment.
Well heap_down isn't implemented and that's the hardest method here. The rest work as advertised with the exception of heap_sort (see my note on that). See if you can implement heap_down as it's a good exercise. If you want me to take another look just ping me on Slack.
| heap.add(list.pop) | ||
| end | ||
| sorted_list = [] | ||
| list.length.times do |
There was a problem hiding this comment.
Remember at this stage the list is empty!
Suggested change
| list.length.times do | |
| until heap.empty? |
Comment on lines
+4
to
+6
| # Time Complexity: o(n log(n)) | ||
| # Space Complexity: o(n) | ||
| def heapsort(list) |
There was a problem hiding this comment.
One showstopper of a bug preventing this from working. See my suggestion below.
Comment on lines
+17
to
19
| # Time Complexity: o(log n) | ||
| # Space Complexity: o(log n) | ||
| def add(key, value = key) |
Comment on lines
+28
to
30
| # Time Complexity: o(log n) | ||
| # Space Complexity: o(log n) | ||
| def remove() |
Comment on lines
+58
to
60
| # Time complexity: o(1) | ||
| # Space complexity: o(1) | ||
| def empty? |
Comment on lines
+70
to
72
| # Time complexity: o(log n) | ||
| # Space complexity: o(log n) | ||
| def heap_up(index) |
CheezItMan
reviewed
Mar 19, 2020
| right_child = (index * 2) + 2 | ||
| return if @store[left_child].nil? | ||
|
|
||
| if @store[left_child].key < @store[right_child].key |
There was a problem hiding this comment.
What if @store[right_child] is nil?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Heaps Practice
Congratulations! You're submitting your assignment!
Comprehension Questions
heap_up&heap_downmethods useful? Why?