全域木 (lib/graph/spanning_tree.hpp)

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Last update: 2025-06-10 13:56:45+09:00
Include: #include "lib/graph/spanning_tree.hpp"

Depends on

重み付きグラフ (lib/graph/graph.hpp)

Code

#pragma once
#include <queue>
#include <vector>
#include "graph/graph.hpp"

/// @brief 全域木
template <class T>
Graph<T> spanning_tree(const Graph<T> &g, int r = 0) {
    int n = g.size();
    Graph<T> res(n);
    std::queue<int> que;
    std::vector<bool> visited(n);
    que.emplace(r);
    visited[r] = true;
    while (!que.empty()) {
        int x = que.front();
        que.pop();
        for (auto &e : g[x]) {
            if (!visited[e.to()]) {
                res.add_edges(e);
                que.emplace(e.to());
                visited[e.to()] = true;
            }
        }
    }
    return res;
}

Traceback (most recent call last):
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/resolver.py", line 291, in resolve
    bundled_code = language.bundle(path, basedir=basedir)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/verify/languages/cplusplus.py", line 242, in bundle
    bundler.update(path)
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/verify/languages/cplusplus_bundle.py", line 479, in update
    self._resolve(pathlib.Path(included), included_from=path)
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/verify/languages/cplusplus_bundle.py", line 286, in _resolve
    raise BundleErrorAt(path, -1, "no such header")
competitive_verifier.oj.verify.languages.cplusplus_bundle.BundleErrorAt: graph/graph.hpp: line -1: no such header