Cod sursa(job #2720856)

Utilizator radu16012003Radu Dumitrache radu16012003 Data 11 martie 2021 12:44:02
Problema Algoritmul lui Dijkstra Scor 70
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <fstream>
#include <queue>
#include <vector>
#define inf (1<<30)
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n,m,d[50000];
vector <pair <int ,int > > g[50000];
priority_queue <int,vector <int>,greater <int> > q;
bool verif[50000];
void dijkstra(int start)
{
    for (int i=1;i<=n;i++)
        d[i]=inf;
    d[start]=0;
    q.push(start);
    verif[start]=true;
    while (!q.empty())
    {
        int nod_curent=q.top();
        q.pop();
        verif[nod_curent]=false;
        for (vector <pair <int,int> > :: iterator it= g[nod_curent].begin();it!=g[nod_curent].end();it++)
        {
            int vecin= (*it).first;
            int cost=(*it).second;
            if (d[nod_curent]+cost <d[vecin])
            {
                d[vecin]=d[nod_curent]+cost;
                if (!verif[vecin])
                {
                    q.push(vecin);
                    verif[vecin]=true;

                }


            }
        }



    }


}


int main()
{
    fin>>n>>m;
    for (int i=1;i<=m;i++)
    {
        int x,y,z;
        fin>>x>>y>>z;
        g[x].push_back(make_pair(y,z));
    }
    dijkstra(1);
    for (int i=2;i<=n;i++)
        if (d[i]!=inf)
        fout<<d[i]<<' ';
    else
        fout<<"0 ";
    return 0;
}