Cod sursa(job #1582985)

Utilizator DarianCDarian Craciun DarianC Data 28 ianuarie 2016 17:35:25
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.2 kb
#include <fstream>
#include <vector>
#include <queue>
#define nmax 50005
#define oo 1<<30
using namespace std;

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

vector< pair<int,int> > G[nmax];
int dmin[nmax],N,M;

class ComparVf{
public:
    bool operator() (const int& x, const int& y)
    {
        return dmin[x]>dmin[y];
    }
};
priority_queue<int, vector<int>, ComparVf> H;

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

void Dijkstra(int x0)
{
    int vfmin, i;
    fill(dmin, dmin+N+1, oo); dmin[x0]=0;
    H.push(x0);

    while(!H.empty())
    {
        vfmin=H.top(); H.pop();
        for(i=0; i<G[vfmin].size(); i++)
            if(dmin[G[vfmin][i].first] > dmin[vfmin]+G[vfmin][i].second)
        {
            dmin[G[vfmin][i].first]=dmin[vfmin] + G[vfmin][i].second;
            H.push(G[vfmin][i].first);
        }
    }
}

void afisare()
{
    for(int i=2; i<=N; i++)
        if(dmin[i]==oo) fout<<0<<' ';
        else fout<<dmin[i]<<' ';
    fout<<'\n';
}
int main()
{
    citire();
    Dijkstra(1);
    afisare();
    return 0;
}