Cod sursa(job #1015709)

Utilizator MarghescuGabriel Marghescu Marghescu Data 24 octombrie 2013 23:59:10
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.48 kb
#include <fstream>
#defe NMAX 50002
 
using namespace std;
 
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
 
int n,m,a[1400][1400],d[NMAX],s[NMAX],p[NMAX];
const int INF=NMAX;
 
void read  ()
{
    f>>n>>m;
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=n; j++)
        {
            if (i==j)
                a[i][j]=0;
            else
                a[i][j]=INF;
        }
    }
    for (int i=1, nod1, nod2, cost; i<=m; i++)
    {
        f>>nod1>>nod2>>cost;
        a[nod1][nod2]=cost;
    }
}
 
void Dijkstra (int x)
{
    int i,j,minim,y;
    y=0;
    s[x]=1;
    for (i=1; i<=n; i++)
    {
        d[i]=a[x][i];
        if (i!=x && d[i]<INF)
        {
            p[i]=x;
        }
    }
    for (i=1; i<=n-1; i++)
    {
        for (j=1, minim=INF; j<=n; j++)
        {
            if (s[j]==0 && d[j]<minim)
            {
                minim=d[j];
                y=j;
            }
        }
        s[y]=1;
        for (j=1; j<=n; j++)
        {
            if (s[j]==0 && d[j]>d[y]+a[y][j])
            {
                d[j]=d[y]+a[y][j];
                p[j]=y;
            }
        }
    }
}
 
 
void print (int x)
{
    for (int i=2; i<=n; i++)
    {
        if (p[i]!=0)
        {
            if (d[i]==INF)
                d[i]=0;
            g<<d[i]<<" ";
        }
    }
}
 
int main ()
{
    read ();
    Dijkstra (1);
    print (1); 
    f.close();
    g.close();
    return 0;
}