Cod sursa(job #2722663)

Utilizator AlexMariMarinescu Alexandru AlexMari Data 13 martie 2021 10:15:29
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.28 kb
#include<bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");

struct elem
{
    int vecin,cost;
};

vector<elem>g[200005];

int n,m,ans[200005],dist[200005],viz[200005];

void bellman()
{
    for(int i=2; i<=n; i++)
        dist[i]=INT_MAX;
    queue<int>coada;
    coada.push(1);
    viz[1]=1;
    while(coada.size())
    {
        int nod=coada.front();
        viz[nod]=0;
        coada.pop();
        for(int i=0; i<g[nod].size(); i++)
        {
            int vecin=g[nod][i].vecin;
            int cost=g[nod][i].cost;
            if(dist[vecin]>dist[nod]+cost)
            {
                dist[vecin]=dist[nod]+cost;
                ans[vecin]++;
                if(ans[vecin]>n)
                {
                    fout<<"Ciclu negativ!";
                    return;
                }
                if(viz[vecin]==0)
                {
                    viz[vecin]=1;
                    coada.push(vecin);
                }
            }
        }
    }
    for(int i=2; i<=n; i++)
        fout<<dist[i]<<" ";
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x,y,z;
        fin>>x>>y>>z;
        g[x].push_back({y,z});
    }
    bellman();
    return 0;
}