Cod sursa(job #2116842)

Utilizator FunnyStockyMihnea Andreescu FunnyStocky Data 28 ianuarie 2018 08:47:47
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream cin("bellmanford.in");
ofstream cout("bellmanford.out");
const int nmax=50000,inf=2000000000;
struct graf
{
    int nod,cost;
};
int n,m;
int a,b,cost;
int nod,nod_nou;
vector<graf>v[nmax+5];
int best[nmax+5];
queue<int>q;
int main()
{
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        cin>>a>>b>>cost;
        v[a].push_back({b,cost});
    }
    for(int i=2;i<=n;i++)
        best[i]=inf;
    q.push(1);
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(int i=0;i<v[nod].size();i++)
        {
            nod_nou=v[nod][i].nod;
            cost=best[nod]+v[nod][i].cost;
            if(cost<best[nod_nou])
            {
                best[nod_nou]=cost;
                q.push(nod_nou);
            }
        }
    }
    for(int i=2;i<=n;i++)
        if(best[i]==inf)
        {
            cout<<"Ciclu negativ!";
            return 0;
        }
    for(int i=2;i<=n;i++)
        cout<<best[i]<<" ";
    return 0;
}