Cod sursa(job #2819338)

Utilizator Danut200333Dumitru Daniel Danut200333 Data 18 decembrie 2021 11:30:20
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.06 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
#define f first
#define s second
#define mp make_pair
vector<pair<int,int> > v[50001];
priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > >h;
int d[50001],n,m,a,b,c,x,i;
int w[50001];
int main()
{
    fin>>n>>m;
    for(i=1; i<=m; i++)
    {
        fin>>a>>b>>c;
        v[a].push_back(mp(c,b));
    }
    for(i=1;i<=n;i++)d[i]=1000000000;
    d[1]=0;
    h.push(mp(0,1));
    while(!h.empty())
    {
        x=h.top().s;
        h.pop();
        for(i=0; i<v[x].size(); i++)
        {
            if(d[x]+v[x][i].f<d[v[x][i].s])
            {
                w[v[x][i].s]++;
                d[v[x][i].s]=d[x]+v[x][i].f;
                h.push(mp(d[v[x][i].s],v[x][i].s));
                if(w[v[x][i].s]==n)
                {
                    fout<<"Ciclu negativ!";
                    return 0;
                }
            }
        }
    }
    for(i=2; i<=n; i++)fout<<d[i]<<" ";
    return 0;
}