Cod sursa(job #2459143)

Utilizator mihaimodiMihai Modi mihaimodi Data 22 septembrie 2019 11:21:12
Problema Algoritmul Bellman-Ford Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.16 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
vector< pair <int,int> >g[50001];
queue <int> q;
int n,m,x,y,c;
int d[50001],nr[50001];
bool viz[50001];
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        g[x].push_back(make_pair(y,c));
    }
    for(int i=2;i<=n;i++)
        d[i]=INT_MAX;

    q.push(1);
    viz[1]=nr[1]=1;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        viz[nod]=0;
        for(int j=0;j<g[nod].size();j++)
        {
            int v=g[nod][j].first;
            int c=g[nod][j].second;
            if(d[v]>d[nod]+c)
            {
                d[v]=d[nod]+c;
                nr[v]++;
                if(nr[v]==n)
                {
                    fout<<"Ciclu negativ!";
                    return 0;
                }
                if(viz[v]==0)
                {
                    q.push(v);
                    viz[v]=1;
                }
            }
        }
    }
    for(int i=2;i<=n;i++)
        fout<<d[i]<<' ';
    return 0;
}