Cod sursa(job #2049718)

Utilizator vladboss2323Ciorica Vlad vladboss2323 Data 27 octombrie 2017 16:23:04
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.09 kb
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

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

const int N=50001;
const int oo=200000000;
vector<pair <int,int > >a[N];
int n,m,s[N],d[N];
void citire()
{
    int i,x,y,z;
    in>>n>>m;
    for(i=1; i<=m; i++)
    {
        in>>x>>y>>z;
        a[x].push_back(make_pair(y,z));
    }
    in.close();
}

void dijkstra()
{
    int i,j,nod,cost;
    for(i=2; i<=n; i++)
        d[i]=oo;
    for(i=1; i<n; i++)
    {
        int minim=oo;
        for(j=1; j<=n; j++)
            if(d[j]<minim && s[j]==0)
            {
                minim=d[j];
                nod=j;
            }
        s[nod]=1;
        for(j=0; j<(int)a[nod].size(); j++)
        {
            int vecin=a[nod][j].first;
            cost=a[nod][j].second;
            d[vecin]=min(d[vecin],d[nod]+cost);
        }
    }

}


int main()
{

    citire();
    dijkstra();
    for(int i=2; i<=n; i++)
    {
        if(d[i]==oo)
            d[i]=0;
        out<<d[i]<<" ";
    }
    return 0;
}