From a82ab0900401ff0a3c616dcd260c6b855d27b7eb Mon Sep 17 00:00:00 2001 From: "pre-commit-ci[bot]" <66853113+pre-commit-ci[bot]@users.noreply.github.com> Date: Mon, 13 Jan 2025 22:08:27 +0000 Subject: [PATCH] [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --- .../binary_tree/lowest_common_ancestor.py | 32 +++++++++---------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/data_structures/binary_tree/lowest_common_ancestor.py b/data_structures/binary_tree/lowest_common_ancestor.py index f99b6c721..2ca489b1f 100644 --- a/data_structures/binary_tree/lowest_common_ancestor.py +++ b/data_structures/binary_tree/lowest_common_ancestor.py @@ -25,21 +25,21 @@ def swap(a: int, b: int) -> tuple[int, int]: def create_sparse(max_node: int, parent: list[list[int]]) -> list[list[int]]: """ Create a sparse table that saves each node's 2^i-th parent. - + The given ``parent`` table should have the direct parent of each node in row 0. This function fills in: - + parent[j][i] = parent[j - 1][parent[j - 1][i]] - + for each j where 2^j is less than max_node. - + For example, consider a small tree where: - Node 1 is the root (its parent is 0), - Nodes 2 and 3 have parent 1. - + We set up the parent table for only two levels (row 0 and row 1) for max_node = 3. (Note that in practice the table has many rows.) - + >>> parent0 = [0, 0, 1, 1] # 0 is unused; node1's parent=0, nodes 2 and 3's parent=1. >>> parent1 = [0, 0, 0, 0] >>> parent = [parent0, parent1] @@ -61,11 +61,11 @@ def lowest_common_ancestor( ) -> int: """ Return the lowest common ancestor (LCA) of nodes u and v in a tree. - + The lists ``level`` and ``parent`` must be precomputed. ``level[i]`` is the depth of node i, and ``parent`` is a sparse table where parent[0][i] is the direct parent of node i. - + >>> # Consider a simple tree: >>> # 1 >>> # / \\ @@ -106,10 +106,10 @@ def breadth_first_search( ) -> tuple[list[int], list[list[int]]]: """ Run a breadth-first search (BFS) from the root node of the tree. - + This sets each node's direct parent (stored in parent[0]) and calculates the depth (level) of each node from the root. - + >>> # Consider a simple tree: >>> # 1 >>> # / \\ @@ -140,17 +140,17 @@ def main() -> None: """ Run a BFS to set node depths and parents in a sample tree, then create the sparse table and compute several lowest common ancestors. - + The sample tree used is: - + 1 - / | \ + / | \ 2 3 4 / / \\ \\ 5 6 7 8 / \\ | / \\ 9 10 11 12 13 - + The expected lowest common ancestors are: - LCA(1, 3) --> 1 - LCA(5, 6) --> 1 @@ -158,9 +158,9 @@ def main() -> None: - LCA(6, 7) --> 3 - LCA(4, 12) --> 4 - LCA(8, 8) --> 8 - + To test main() without it printing to the console, we capture the output. - + >>> import sys >>> from io import StringIO >>> backup = sys.stdout