Cod sursa(job #1284175)

Utilizator PetrutiuPaulPetrutiu Paul Gabriel PetrutiuPaul Data 6 decembrie 2014 12:17:36
Problema Algoritmul Bellman-Ford Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.02 kb
#include <iostream>
#include <fstream>
#include <set>
#include <vector>

using namespace std;

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

vector<int> v[50100],c[50100];
set<pair< int, int> >s;
int d[50100],n,m,inf=10000000000;

void dijkstra()
{
    int x,val;
    for(int i=2;i<=n;i++)d[i]=inf;
    s.insert(make_pair(0,1));
    while(s.size()>0)
    {
        val=(*s.begin()).first;
        x=(*s.begin()).second;
        s.erase(*s.begin());
        for(int i=0;i<v[x].size();i++)
        {
            if(d[ v[x][i]] > c[x][i]+val)
            {
                d[v[x][i]]=c[x][i]+val;
                s.insert(make_pair(d[v[x][i]],v[x][i]));
            }
        }
    }
}


int main()
{
    int x,y,z;
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>z;
        v[x].push_back(y);
        c[x].push_back(z);
    }

    dijkstra();

    for(int i=2;i<=n;i++)
    {
        if(d[i]==inf)fout<<0<<' ';
        else fout<<d[i]<<' ';
    }
}