Cod sursa(job #2702429)

Utilizator radumihai10Radu Caprarin radumihai10 Data 3 februarie 2021 23:26:05
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.53 kb
#include <fstream>
#include <iostream>
#include <queue>
#include <vector>

using namespace std;

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

const int NMax = 5005;
const int oo = (1 << 30);

int N, M;
int D[NMax];
bool inCoada[NMax];

vector<pair<int, int>> G[NMax];

struct comparaDistante {
    bool operator()(int x, int y) {
        return D[x] > D[y];
    }
};

priority_queue<int, vector<int>, comparaDistante> Coada;

void Citeste() {
    fin >> N >> M;
    for (int i = 1; i <= M; i++) {
        int x, y, c;
        fin >> x >> y >> c;
        G[x].push_back(make_pair(y, c));
    }
}

void Dijkstra(int nodStart) {
    for (int i = 1; i <= N; i++) {
        D[i] = oo;
    }
    D[nodStart] = 0;
    Coada.push(nodStart);
    inCoada[nodStart] = true;
    while (!Coada.empty()) {
        int nodCurent = Coada.top();
        Coada.pop();
        inCoada[nodCurent] = false;

        for (size_t i = 0; i < G[nodCurent].size(); i++) {
            int Vecin = G[nodCurent][i].first;
            int Cost = G[nodCurent][i].second;
            if (D[nodCurent] + Cost < D[Vecin]) {
                D[Vecin] = D[nodCurent] + Cost;
                if (inCoada[Vecin] == false) {
                    Coada.push(Vecin);
                    inCoada[Vecin] = true;
                }
            }
        }
    }
}

void Afiseaza() {
    for (int i = 2; i <= N; i++) {
        if (D[i] != oo)
            fout << D[i] << " ";
        else
            fout << "0 ";
    }
}
int main() {
    Citeste();
    Dijkstra(1);
    Afiseaza();
    return 0;
}