ダイクストラ法 (lib/graph/dijkstra_potential.hpp)

• View this file on GitHub
• Last update: 2025-06-10 13:56:45+09:00
• Include: #include "lib/graph/dijkstra_potential.hpp"

Depends on

• 重み付きグラフ (lib/graph/graph.hpp)

Code

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

/// @brief ダイクストラ法
template <class T, class U>
std::vector<T> dijkstra(const Graph<T> &g, const std::vector<U> &potentials, int s = 0,
                        T inf = std::numeric_limits<T>::max()) {
    struct _node {
        constexpr _node() : _to(), _dist() {}
        constexpr _node(int to, T dist) : _to(to), _dist(dist) {}
        constexpr bool operator<(const _node &rhs) const { return this->dist() < rhs.dist(); }
        constexpr bool operator>(const _node &rhs) const { return rhs < *this; }

        constexpr int to() const { return this->_to; }
        constexpr T dist() const { return this->_dist; }

      private:
        int _to;
        T _dist;
    };
    int n = g.size();
    std::vector<T> dists(n, inf);
    std::priority_queue<_node, std::vector<_node>, std::greater<>> p_que;
    dists[s] = T();
    p_que.emplace(s, T());
    while (!p_que.empty()) {
        auto node = p_que.top();
        p_que.pop();
        if (dists[node.to()] < node.dist()) continue;
        for (auto &e : g[node.to()]) {
            auto next_dist = node.dist() + e.weight() + potentials[node.to()] - potentials[e.to()];
            if (next_dist < dists[e.to()]) {
                dists[e.to()] = next_dist;
                p_que.emplace(e.to(), next_dist);
            }
        }
    }
    for (int i = 0; i < n; ++i) dists[i] += potentials[i] - potentials[s];
    return dists;
}

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

Back to top page