mathdatech/Python
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/Python.git synced 2025-04-21 21:27:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

[pre-commit.ci] auto fixes from pre-commit.com hooks

Browse Source 
for more information, see https://pre-commit.ci
This commit is contained in:
pre-commit-ci[bot] 2024-10-19 11:14:53 +00:00
parent 55e6a87625
commit eaafd1ca3c
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
data_structures/persistent_segment_tree.py
View File

@ -1,11 +1,13 @@
from __future__ import annotations from __future__ import annotations
class Node: class Node:
def __init__(self, value: int = 0) -> None: def __init__(self, value: int = 0) -> None:
self.value: int = value self.value: int = value
self.left: Node | None = None self.left: Node | None = None
self.right: Node | None = None self.right: Node | None = None
class PersistentSegmentTree: class PersistentSegmentTree:
def __init__(self, arr: list[int]) -> None: def __init__(self, arr: list[int]) -> None:
self.n: int = len(arr) self.n: int = len(arr)
@ -81,8 +83,9 @@ class PersistentSegmentTree:
new_node.left = node.left new_node.left = node.left
new_node.right = self._update(node.right, mid + 1, end, index, value) new_node.right = self._update(node.right, mid + 1, end, index, value)
new_node.value = (new_node.left.value if new_node.left else 0) + \ new_node.value = (new_node.left.value if new_node.left else 0) + (
(new_node.right.value if new_node.right else 0) new_node.right.value if new_node.right else 0
)
return new_node return new_node
@ -121,12 +124,15 @@ class PersistentSegmentTree:
if left <= start and right >= end: if left <= start and right >= end:
return node.value return node.value
mid = (start + end) // 2 mid = (start + end) // 2
return (self._query(node.left, start, mid, left, right) + return self._query(node.left, start, mid, left, right) + self._query(
self._query(node.right, mid + 1, end, left, right)) node.right, mid + 1, end, left, right
)
# Running the doctests # Running the doctests
if __name__ == "__main__": if __name__ == "__main__":
import doctest import doctest
print("Running doctests...") print("Running doctests...")
result = doctest.testmod() result = doctest.testmod()
print(f"Ran {result.attempted} tests, {result.failed} failed.") print(f"Ran {result.attempted} tests, {result.failed} failed.")