Cod sursa(job #2656461)

Utilizator divianegoescuDivia Negoescu divianegoescu Data 7 octombrie 2020 19:33:51
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <fstream>
#include <vector>
#include <deque>
#define K 50002
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
int n,m,i,j,x,y,c,f[K],viz[K],d[K];
vector <pair <int,int> > v[K];
deque <int> q;
int main(){
    fin>>n>>m;
    for(i=1;i<=m;i++){
        fin>>x>>y>>c;
        v[x].push_back({y,c});
    }
    for(i=2;i<=n;i++)
        d[i]=9999999;
    q.push_back(1);
    f[1]=viz[1]=1;
    while(!q.empty()){
        int nod=q.front();
        q.pop_front();
        viz[nod]=0;
        for(i=0;i<v[nod].size();i++){
            int vecin=v[nod][i].first;
            int cost=v[nod][i].second;
            if(d[nod]+cost<d[vecin]){
                d[vecin]=d[nod]+cost;
                if(!viz[vecin]){
                    f[vecin]++;
                    viz[vecin]=1;
                    q.push_back(vecin);
                    if(f[vecin]==n){fout<<"Ciclu negativ!";return 0;}
                }
            }
        }
    }
    for(i=2;i<=n;i++)
        fout<<d[i]<<" ";
    return 0;
}