Cod sursa(job #2592757)

Utilizator georgecristian2002Raducanu George-Cristian georgecristian2002 Data 2 aprilie 2020 12:18:09
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.25 kb
#include<fstream>
using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

const  int INF=1<<20;
int a[5000][5000],d[5000],mini,v[5000],n,start,poz,i,m;

void citire()
{
    int x,y,z;
    fin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            a[i][j]=INF;
        }
        a[i][i]=0;
    }
    while(m)
    {
        fin>>x>>y>>z;
        a[x][y]=z;
        a[y][x]=z;
        m--;
    }
}
void dijkstra(int C)
{
    v[C] = 1 ;
    for(i =1 ; i <= n ; i ++ )
    {
        d[i] = a[C][i];
    }
    for(int i=1;i<=n-1;i++)
    {
        int mini=INF;
        for(int j=1;j<=n;j++)
        {
            if(v[j]==0)
                if(d[j]<mini)
            {
                mini=d[j];
                poz=j;
            }
        }
        v[poz]=1;
        for(int j=1;j<=n;j++)
        {
            if(v[j]==0)
                if(d[j]>d[poz]+a[poz][j])
            {
                d[j]=d[poz]+a[poz][j];
            }
        }
    }

}
int main()
{
    citire();
    dijkstra(1);
    for(int i=2;i<=n;i++)
    {
        if(d[i]==INF) fout<<"-1";
        else fout<<d[i]<<" ";
    }
    fin.close();
    fout.close();
    return 0;
}