Cod sursa(job #1813109)

Utilizator MihaiPescaruMihai Pescaru MihaiPescaru Data 22 noiembrie 2016 18:26:58
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.13 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int m,start[50005],i,n,vmin,j,k,T[3][250005],c,x,y,d[50002],viz[50002],infinit=2000000000;
int main()
{
    fin>>n>>m;
    k=0;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        k++;
        T[0][k]=y;
        T[1][k]=c;
        T[2][k]=start[x];
        start[x]=k;

    }
    for(i=1;i<=n;i++)
    {
        viz[i]=0;
        d[i]=infinit;
    }
    d[1]=0;
    for(i=1;i<=n;i++)
    {
        vmin=infinit;
        for(j=1;j<=n;j++)
        {
            if(viz[j]==0 && d[j]<vmin)
            {
                vmin=d[j];
                k=j;
            }
        }
        if(vmin==2000000000)
            break;
        viz[k]=1;
        for(j=start[k];j!=0;j=T[2][j])
        {
            y=T[0][j];
            c=T[1][j];
            if(d[k]+c<d[y])
            {
                d[y]=d[k]+c;
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if(d[i]==infinit)
            fout<<"0 ";
        else
            fout<<d[i]<<" ";
    }
    return 0;
}