Space - Lee #27
Open
Space - Lee #27
Conversation
This file contains hidden or 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
Oct 7, 2020
CheezItMan
left a comment
CheezItMan
left a comment
There was a problem hiding this comment.
Nice work Lee, you hit the learning goals here. Well done.
Comment on lines
+4
to
6
| # Time Complexity: O(n log n), where n is the number of nodes and because this method adds the elements to a heap, then places them back in the array in order | ||
| # Space Complexity: O(log n), due to recursive calls of the heap_up and heap_down methods within the add and remove methods | ||
| def heapsort(list) |
There was a problem hiding this comment.
👍 Since you are building a heap, the space complexity is O(n) (a heap of n elements).
Comment on lines
+17
to
19
| # Time Complexity: O(log n), where n is the number of nodes in a heap (a complete binary tree has log n levels) | ||
| # Space Complexity: O(log n), due to recursive calls of the heap_up method | ||
| def add(key, value = key) |
Comment on lines
+26
to
28
| # Time Complexity: O(log n), where n is the number of nodes in a heap (a complete binary tree has log n levels) | ||
| # Space Complexity: O(log n), due to recursive calls of the heap_down method | ||
| def remove() |
Comment on lines
+54
to
56
| # Time complexity: O(n), where n is the number of nodes | ||
| # Space complexity: O(1) | ||
| def empty? |
| # It could be **very** helpful for the add method. | ||
| # Time complexity: ? | ||
| # Space complexity: ? | ||
| def heap_up(index) |
| # This helper method takes an index and | ||
| # moves it up the heap if it's smaller | ||
| # than it's parent node. | ||
| def heap_down(index) |
There was a problem hiding this comment.
Nice, very clever way to handle checking if the right and left children are beyond the array.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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?