Cod sursa(job #2565430)

Utilizator MihneaGhiraMihnea MihneaGhira Data 2 martie 2020 14:13:37
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.14 kb
#include<fstream>
#include<queue>
#include<vector>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
int n,m,x,y,c;
int f[50010],verif[50010],d[50010];
vector < pair<int,int> > L[50010];
queue <int> coada;
int main(){
    fin>>n>>m;
    for(int i=1;i<=m;i++){
        fin>>x>>y>>c;
        L[x].push_back(make_pair(y,c));
    }
    for(int i=1;i<=n;i++)
        d[i]=200000000;
    coada.push(1);
    d[1]=0;
    f[1]=1;
    while(!coada.empty()){
        x=coada.front();
        coada.pop();
        f[x]=0;
        for(int i=0;i<L[x].size();i++){
            int vecin=L[x][i].first;
            int cost=L[x][i].second;
            if(d[vecin]>d[x]+cost){
                d[vecin]=d[x]+cost;
                if(f[vecin]==0){
                    verif[vecin]++;
                    if(verif[vecin]==n){
                        fout<<"Ciclu negativ!";
                        return 0;
                    }
                }
                coada.push(vecin);
                f[vecin]=1;
            }
        }
    }
    for(int i=2;i<=n;i++)
        fout<<d[i]<<" ";
    return 0;
}