Cod sursa(job #2565457)

Utilizator mirceaisherebina mircea mirceaishere Data 2 martie 2020 14:15:55
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.08 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");

int n, m, i, j, x, y, c, d[50010], f[50010], v[50010], nod, vecin, cost;
vector < pair<int, int> > a[50010];
queue <int> s;

int main(){
    fin>>n>>m;
    for(i=1; i<=m; i++){
        fin>>x>>y>>c;
        a[x].push_back({y, c});
    }
    for(i=1; i<=n; i++){
        d[i]=1000000000;
    }
    s.push(1);
    v[1]=1;
    d[1]=0;
    while(!s.empty()){
        nod=s.front();
        v[nod]=0;
        f[nod]++;
        if(f[nod]>n){
            fout<<"Ciclu negativ!";
            return 0;
        }
        for(i=0; i<a[nod].size(); i++){
            vecin=a[nod][i].first;
            cost=a[nod][i].second;
            if(d[nod]+cost<d[vecin]){
                d[vecin]=d[nod]+cost;
                if(v[vecin]==0){
                    s.push(vecin);
                    v[vecin]=1;
                }
            }
        }
        s.pop();
    }
    for(i=2; i<=n; i++){
        fout<<d[i]<<" ";
    }
}