Cod sursa(job #2179384)

Utilizator RaduXD1Nicolae Radu RaduXD1 Data 20 martie 2018 10:32:12
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.3 kb
#include <fstream>
#include <queue>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
vector<pair <int, int> > v[50003];
deque<int> co;
int n, m, i, a, b, c, cost, nod, vecin ,d[50003], f[50003], h[50003];

int main()
{
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {
        fin>>a>>b>>c;
        v[a].push_back(make_pair(b, c));
    }
    for(i=1;i<=n;i++)
        d[i]=10000000;
    d[1]=0;h[nod]=1;
    co.push_back(1);
    while(co.size())
    {
        nod=co.front();
        co.pop_front();
        h[nod]=0;
        for(i=0;i<v[nod].size();i++)
        {
            vecin=v[nod][i].first;
            cost=v[nod][i].second;
            if(d[vecin]>d[nod]+cost)
            {
                if(h[vecin]==0)
                {
                    co.push_back(vecin);
                    h[vecin]=1;
                }
                d[vecin]=d[nod]+cost;
                f[vecin]++;
                if(f[vecin]==n)
                {
                    fout<<"Ciclu negativ!";
                    return 0;
                }
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if(d[i]==10000000)
            fout<<0<<" ";
        else
            fout<<d[i]<<" ";
    }
    fin.close();
    fout.close();
    return 0;
}