Cod sursa(job #3199804)

Utilizator indianu_talpa_iuteTisca Catalin indianu_talpa_iute Data 2 februarie 2024 18:02:37
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.06 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

int main() {
    int n, m;
    fin >> n >> m;
    std::vector<vector<pair<int, int>>> graph(n);

    for (int i = 0; i < m; i++) {
        int from, to, dist;
        fin >> from >> to >> dist;
        from--, to--;
        graph[from].emplace_back(to, dist);
    }

    std::vector<int> dists(n, INT_MAX);
    std::priority_queue<
            pair<int, int>,
            std::vector<pair<int, int>>,
            greater<>
    > path;
    path.emplace( 0, 0 );
    while (!path.empty()) {
        pair<int, int> current = path.top(); path.pop();
        for (auto& neighbour: graph[current.first]) {
            if (dists[neighbour.first] > current.second + neighbour.second) {
                dists[neighbour.first] = current.second + neighbour.second;
                path.emplace( neighbour.first, current.second + neighbour.second );
            }
        }
    }

    for (int i = 1; i < n; i++)
        fout << (dists[i] == INT_MAX ? 0 : dists[i]) << " ";
    return 0;
}