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07e991d553
* ci(pre-commit): Add pep8-naming to `pre-commit` hooks (#7038) * refactor: Fix naming conventions (#7038) * Update arithmetic_analysis/lu_decomposition.py Co-authored-by: Christian Clauss <cclauss@me.com> * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * refactor(lu_decomposition): Replace `NDArray` with `ArrayLike` (#7038) * chore: Fix naming conventions in doctests (#7038) * fix: Temporarily disable project euler problem 104 (#7069) * chore: Fix naming conventions in doctests (#7038) Co-authored-by: Christian Clauss <cclauss@me.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
from __future__ import annotations
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def dfs(u):
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global graph, reversed_graph, scc, component, visit, stack
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if visit[u]:
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return
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visit[u] = True
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for v in graph[u]:
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dfs(v)
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stack.append(u)
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def dfs2(u):
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global graph, reversed_graph, scc, component, visit, stack
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if visit[u]:
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return
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visit[u] = True
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component.append(u)
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for v in reversed_graph[u]:
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dfs2(v)
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def kosaraju():
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global graph, reversed_graph, scc, component, visit, stack
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for i in range(n):
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dfs(i)
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visit = [False] * n
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for i in stack[::-1]:
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if visit[i]:
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continue
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component = []
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dfs2(i)
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scc.append(component)
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return scc
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if __name__ == "__main__":
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# n - no of nodes, m - no of edges
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n, m = list(map(int, input().strip().split()))
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graph: list[list[int]] = [[] for i in range(n)] # graph
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reversed_graph: list[list[int]] = [[] for i in range(n)] # reversed graph
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# input graph data (edges)
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for i in range(m):
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u, v = list(map(int, input().strip().split()))
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graph[u].append(v)
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reversed_graph[v].append(u)
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stack: list[int] = []
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visit: list[bool] = [False] * n
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scc: list[int] = []
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component: list[int] = []
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print(kosaraju())
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