Abigail C. - Rock #36
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CheezItMan
reviewed
Jan 18, 2022
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| def heap_sort(list): | ||
| """ This method uses a heap to sort an array. | ||
| Time Complexity: ? | ||
| Space Complexity: ? | ||
| Time Complexity: O(n log n) | ||
| Space Complexity: O(1) |
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👍 However the space complexity is O(n) because you are building up a heap of n nodes as the function runs.
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| if value == None: | ||
| value = key | ||
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| node = HeapNode(key,value) | ||
| self.store.append(node) | ||
| self.heap_up(len(self.store) -1) |
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| def remove(self): | ||
| """ This method removes and returns an element from the heap | ||
| maintaining the heap structure | ||
| Time Complexity: ? | ||
| Time Complexity: O(log n) | ||
| Space Complexity: ? | ||
| """ | ||
| pass | ||
| if len(self.store) == 0: | ||
| return None | ||
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| self.swap(0, len(self.store) -1) | ||
| min = self.store.pop() | ||
| self.heap_down(0) |
| @@ -49,7 +61,7 @@ def empty(self): | |||
| Time complexity: ? | |||
| Space complexity: ? | |||
| """ | |||
| pass | |||
| return self.store == [] | |||
| @@ -49,7 +61,7 @@ def empty(self): | |||
| Time complexity: ? | |||
| Space complexity: ? | |||
| """ | |||
| pass | |||
| return self.store == [] | |||
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| def heap_up(self, index): | |||
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| def heap_down(self, index): | ||
| """ This helper method takes an index and | ||
| moves the corresponding element down the heap if it's | ||
| larger than either of its children and continues until | ||
| the heap property is reestablished. | ||
| """ |
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Heaps Practice
Congratulations! You're submitting your assignment!
Comprehension Questions
heap_up&heap_downmethods useful? Why?