Cod sursa(job #1332544)

Utilizator Eugen_VlasieFMI Vlasie Eugen Eugen_Vlasie Data 2 februarie 2015 10:11:06
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp Status done
Runda Arhiva educationala Marime 1.1 kb
#include<fstream>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
queue<int> q;
vector<pair<int,int> > v[50010];
pair<int,int> per1,per2;
int n,m,a,b,i,c,viz[50010],dist[50010],d1,n1,n2,d2;
int main()
{
    f>>n>>m;
    for(i=1;i<=n;i++)
        dist[i]=1000000000;
    for(i=1;i<=m;i++)
    {
        f>>a>>b>>c;
        v[a].push_back(pair<int,int>(b,c));
    }
    dist[1]=0;
    q.push(1);
    while(!q.empty())
    {
        n1=q.front();
        q.pop();
        viz[n1]++;
        if(viz[n1]==n)
        {
            g<<"Ciclu negativ"<<'\n';
            return 0;
        }
        for(vector<pair<int,int> >::iterator it=v[n1].begin();it!=v[n1].end();it++)
        {
            per2=*it;
            n2=per2.first;
            d2=per2.second;
            if(dist[n2]>dist[n1]+d2)
            {
                dist[n2]=dist[n1]+d2;
                q.push(n2);
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        g<<dist[i]<<' ';
    }
    g<<'\n';
    return 0;
}