Cod sursa(job #888100)

Utilizator narcis_c2007Ciobotariu Narcis Paul Dumitru narcis_c2007 Data 24 februarie 2013 10:35:12
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.17 kb
#include <iostream>
#include<fstream>
using namespace std;
const int inf=1<<30;
struct graf
{
    int nod,cost;
    graf *next;
};
int verif[50001],d[50001],n,m;
graf *a[50001];
void add(int unde,int ce,int cost)
{
    graf *q=new graf;
    q->cost=cost;
    q->nod=ce;
    q->next=a[unde];
    a[unde]=q;
}
void citire()
{
    int i,x,y,z;
    ifstream f("dijkstra.in");
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>x>>y>>z;
        add(x,y,z);
    }
}
void dijkstra(int inceput)
{
    int i,j,min,qmin=0;
    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)
        {
            qmin=j;
            min=d[j];
        }
        verif[qmin]=1;
        graf*t=a[qmin];
        while(t)
        {
            if(d[t->nod]>d[qmin]+t->cost)
                d[t->nod]=d[qmin]+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;
}