Cod sursa(job #1086695)

Utilizator DanaNeaguDaniela D DanaNeagu Data 18 ianuarie 2014 14:25:49
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include <iostream>
#include <fstream>
#define inf 100000;
using namespace std;

long long n, x0;
double c[10000][10000], d[10000];
long long pre[10000], M[10000];
ofstream g("dijkstra.out");
void initializare();
void afisare();

int main()
{
long long i, vfmin, j;
double dmin;
initializare();
for(j=1;j<n;j++)
{
    dmin=inf;
    for(i=1;i<=n;i++)
        if(!M[i] && dmin>d[i])
            {
            dmin=d[i];
            vfmin=i;
            }
    M[vfmin]=1;
    for(i=1;i<=n;i++)
        if(!M[i] && d[i]>dmin+c[vfmin][i])
            {
            pre[i]=vfmin;
            d[i]=dmin+c[vfmin][i];
            }
}
afisare();
return 0;
}
void initializare()
{  long long i, j, m, x, y;
    double cost;
    ifstream f("dijkstra.in");
    f>>n>>m;
    x0=1;
    for(i=1;i<=n;i++)
        for(j=i+1;j<=n;j++)
            c[j][i]=c[i][j]=inf;
    for(i=1;i<=m;i++)
        {
        f>>x>>y>>cost;
        c[x][y]=cost;
        }
    for(i=1;i<=n;i++)
        {
        d[i]=c[x0][i];
        pre[i]=x0;
        }
    M[x0]=1;
    pre[x0]=0;
    f.close();
}

void afisare()
{
    long i, j;
    for(i=1;i<=n;i++)
        if(i!=x0)
            g<<d[i]<<' ';
}