Cod sursa(job #2674678)

Utilizator Iulia14iulia slanina Iulia14 Data 19 noiembrie 2020 20:00:31
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.29 kb
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream cin ("dijkstra.in");
ofstream cout ("dijkstra.out");
struct ura{
    int x, c;
    bool operator <(const ura &other) const{
        return c > other.c;
    }
};
int n;
vector <ura> lista[50005];
priority_queue <ura> pq;
int dist[50005];
int viz[50005];
void dijkstra(int s)
{
    int i;
    for (i = 1; i <= n; i++)
       viz[i] = 0, dist[i] = 2e9;
 //   viz[s] = 1;
    dist[s] = 0;
    pq.push({s, 0});
    while (!pq.empty())
    {
        int x = pq.top().x;
        pq.pop();
        if (viz[x])
            continue;
        viz[x] = 1;
        for (i = 0; i < lista[x].size(); i++)
        {
            int y = lista[x][i].x;
            int c = lista[x][i].c;
            if (dist[y] > dist[x] + c)
            {
                dist[y] = dist[x] + c;
                pq.push({y, dist[y]});
            }
        }
    }
    for (i = 2; i <= n; i++)
        if (dist[i] != 2e9)
            cout << dist[i] << " ";
        else
            cout << 0 << " ";
}
int main()
{
    int m, i;
    cin >> n >> m;
    for (i = 1; i <= m; i++)
    {
        int x, y, c;
        cin >> x >> y >> c;
        lista[x].push_back({y, c});
    }
    dijkstra(1);

    return 0;
}