Cod sursa(job #2849928)

Utilizator Theo14Ancuta Theodor Theo14 Data 15 februarie 2022 22:58:58
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include<bits/stdc++.h>
using namespace std;

ifstream f("bellmanford.in");
ofstream g("bellmanford.out");

int n,m,d[50003],in[50003],nr[50003];
vector< pair<int,int> >v[50003];
queue<int>q;

int main()
{
    int i,x,y,c;
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>x>>y>>c;
        v[x].push_back(make_pair(y,c));
    }
    q.push(1);
    in[1]=1;
    for(i=2;i<=n;i++)
        d[i]=1<<30;
    d[i]=0;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        in[nod]=0;
        for(auto it:v[nod])
        {
            int p=it.first;
            int z=it.second;
            if(d[p]>d[nod]+z)
            {
                d[p]=d[nod]+z;
                if(in[p]==0)
                {
                    nr[p]++;
                    if(nr[p]==n)
                    {
                        g<<"Ciclu negativ!";
                        return 0;
                    }
                    q.push(p);
                    in[p]=1;
                }
            }
        }
    }
    for(i=2;i<=n;i++)
        g<<d[i]<<" ";
    return 0;
}