Cod sursa(job #885536)

Utilizator narcis_c2007Ciobotariu Narcis Paul Dumitru narcis_c2007 Data 22 februarie 2013 08:54:32
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.16 kb
#include<fstream>
using namespace std;
const int inf = 1 << 30;
struct graf
{
  int nod,cost;
  graf *next;
};
int n,m;
graf *a[50001];
int d[50001],verif[50001];
void add(int unde,int ce,int cost)
{
    graf*q=new graf;
    q->nod=ce;
    q->cost=cost;
    q->next=a[unde];
    a[unde]=q;
}
void citire()
{
    ifstream f("dijkstra.in");
    f>>n>>m;
    int x,y,z;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y>>z;
        add(x,y,z);
    }
}
void dijkstra(int inceput)
{
    int min,pmin,i,j;
    for(i=1;i<=n;i++)
    if(i!=inceput)
    d[i]=inf;
    for(i=1;i<=n;i++)
    {
        min=inf;
        for(j=1;j<=n;j++)
            if(min>d[j]&&verif[j]==0)
            {
                min=d[j];
                pmin=j;
            }
        verif[pmin]=1;
        graf *t=a[pmin];
        while(t)
        {
            if(d[t->nod]>d[pmin]+t->cost)
            d[t->nod]=d[pmin]+t->cost;
            t=t->next;
        }
    }
}
int main()
{
    citire();
    dijkstra(1);
    ofstream g("dijkstra.out");
    for ( int i = 2; i <= n; i++ )
    if(d[i]!=inf)
        g<<d[i]<<" ";
else
g<<"0 ";
    return 0;
}