Cod sursa(job #2099754)

Utilizator serjiuuAvacaritei Sergiu serjiuu Data 4 ianuarie 2018 17:26:40
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include<fstream>
#include<climits>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n,p,dist[101],t[101],a[101][101],viz[101],m;
void dijkstra(int p)
{
    int i,j,poz;
    for(i=1;i<=n;i++)
    {
        dist[i]=a[p][i];
        if(dist[i]!=999999 && i!=p)
            t[i]=p;
        else
            t[i]=0;
    }
    viz[p]=1;
    t[p]=p;
    for(i=1;i<=n-1;i++)
    {
        int mini=999999;
        for(j=1;j<=n;j++)
            if(!viz[j] && dist[j]<mini)
            {
                mini=dist[j];
                poz=j;
            }
        for(j=1;j<=n;j++)
            if(!viz[j] & dist[j]>dist[poz]+a[poz][j])
            {
                dist[j]=dist[poz]+a[poz][j];
                t[j]=poz;
            }
        viz[poz]=1;
    }
    for(i=2;i<=n;i++)
        if(t[i])
            fout<<dist[i]<<' ';
        else
            fout<<0<<' ';
}
int main()
{
    int x,y,c,i,j;
    fin>>n>>m;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(i!=j)
                a[i][j]=999999;
            else
                a[i][j]=0;
    while(m--)
    {
        fin>>x>>y>>c;
        a[x][y]=c;
    }

    dijkstra(1);
}