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pre-commit-ci[bot] 2024-11-18 04:10:31 +00:00
parent a92936bd01
commit 071ce716e4
1 changed files with 9 additions and 7 deletions
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10
data_structures/heap/fibonacci_heap.py
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@ -12,6 +12,7 @@ Operations supported:
- Merge: O(1) - Merge: O(1)
""" """
class Node: class Node:
""" """
A node in a Fibonacci heap. A node in a Fibonacci heap.
@ -28,6 +29,7 @@ class Node:
degree: Number of children. degree: Number of children.
mark: Boolean indicating if node has lost a child. mark: Boolean indicating if node has lost a child.
""" """
def __init__(self, val): def __init__(self, val):
self.val = val self.val = val
self.parent = None self.parent = None
@ -231,7 +233,7 @@ class FibonacciHeap:
This is an internal method that maintains the heap's structure. This is an internal method that maintains the heap's structure.
""" """
max_degree = int(self.size ** 0.5) + 1 max_degree = int(self.size**0.5) + 1
degree_table = [None] * max_degree degree_table = [None] * max_degree
# Collect all roots # Collect all roots
@ -299,7 +301,7 @@ class FibonacciHeap:
Args: Args:
node: Node to be cut. node: Node to be cut.
parent: Parent of the node to be cut. parent: Parent of the node to be cut.
"""""" """ """
Performs cascading cut operation. Performs cascading cut operation.
Args: Args:
@ -324,8 +326,7 @@ class FibonacciHeap:
node: Starting node for cascading cut. node: Starting node for cascading cut.
""" """
parent = node.parent if parent := node.parent:
if parent:
if not node.mark: if not node.mark:
node.mark = True node.mark = True
else: else:
@ -359,4 +360,5 @@ class FibonacciHeap:
if __name__ == "__main__": if __name__ == "__main__":
import doctest import doctest
doctest.testmod() doctest.testmod()