Cod sursa(job #2317106)

Utilizator AltexStefanButacu Stefan AltexStefan Data 12 ianuarie 2019 20:22:12
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <iostream>
#include <fstream>
#define Nmax 20000
using namespace std;
int a[Nmax][Nmax],n,m;
int inf=(1 << 30);
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
void citire()
{
    int i,j,x,y,c;
    f>>n;
    f>>m;
    for(int i=1;i<=m;i++)
        {
            f>>x>>y>>c;
            a[x][y]=c;
        }
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if( a[i][j]==0 && i!=j) a[i][j]=inf;
}
 int d[Nmax],viz[Nmax],tata[Nmax];
void Dijkstra (int x0)
{
    int i,j,ok;
    int mini,k;
    for(i=1; i<=n; i++)
    {
        d[i]=a[x0][i];
    }
    tata[x0]=0;
    viz[x0]=1;
    ok=1;
    while(ok)
    {
        mini=inf;
        for(i=1; i<=n; i++)
        if(viz[i]==0 && mini > d[i])
        {
            mini=d[i];
            k=i;
        }
        if(mini != inf)
        {
            viz[k]=1;
            for(i=1;i<=n;i++)
            {
                if(viz[i]==0 && d[i] > d[k]+a[k][i])
                {
                    tata[i]=k;
                    d[i]= d[k]+a[k][i];

                }
            }
        }
        else ok=0;
    }
}
int main()
{

    citire();
    Dijkstra(1);
    for(int i=2;i<=n;i++)
        g<<d[i]<<" ";
    return 0;
}