C15 - Katrina K#24
Open
SterlingSunshine wants to merge 1 commit into
Open
Conversation
CheezItMan
reviewed
Jan 11, 2022
CheezItMan
left a comment
CheezItMan
left a comment
There was a problem hiding this comment.
Nice work Katrina, you hit the learning goals here. Well done.
Comment on lines
3
to
7
| def heap_sort(list): | ||
| """ This method uses a heap to sort an array. | ||
| Time Complexity: ? | ||
| Space Complexity: ? | ||
| """ |
Comment on lines
21
to
26
| def add(self, key, value = None): | ||
| """ This method adds a HeapNode instance to the heap | ||
| If value == None the new node's value should be set to key | ||
| Time Complexity: ? | ||
| Space Complexity: ? | ||
| Time Complexity: O(log n) | ||
| Space Complexity: O(1) *same space is added to the list every time but the behind the scenes buffer might be using more memory than this | ||
| """ |
There was a problem hiding this comment.
👍 The space complexity is also log n due to the recursive call stack as you note
Comment on lines
30
to
35
| def remove(self): | ||
| """ This method removes and returns an element from the heap | ||
| maintaining the heap structure | ||
| Time Complexity: ? | ||
| Space Complexity: ? | ||
| Time Complexity: O(log n) | ||
| Space Complexity: O(1) | ||
| """ |
There was a problem hiding this comment.
👍 The space complexity is also O(log n)
Comment on lines
+62
to
+65
| if len(self.store) < 1: | ||
| return True | ||
|
|
||
| return False |
There was a problem hiding this comment.
Suggested change
| if len(self.store) < 1: | |
| return True | |
| return False | |
| return len(self.store) == 0 |
| return False | ||
|
|
||
|
|
||
| def heap_up(self, index): |
There was a problem hiding this comment.
👍 Due to the call stack the space complexity is O(log n)
Comment on lines
+96
to
+97
| self.heap_down((index * 2 + 2)) | ||
| self.heap_down(index) |
There was a problem hiding this comment.
This works, but you do potentially end up with an extra swap. However you avoid extra complicated conditionals.
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
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?