Cod sursa(job #1769224)

Utilizator radu_uniculeu sunt radu radu_unicul Data 2 octombrie 2016 11:15:41
Problema Algoritmul Bellman-Ford Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 1.31 kb
#include<cstdio>
#include<vector>
#include<queue>
using namespace std;
#define inf 999999
int n,m,x,y,z;

struct edge
{
    int nod;
    int cost;
};

vector<edge> v[50050];
int dist[50055],checked[50055];
bool ciclunegativ=false;
queue<int> toupdate;

int main()
{
    freopen("bellmanford.in","r",stdin);
    freopen("bellmanford.out","w",stdout);
    scanf("%d %d",&n,&m);
    for(int i=0; i<m; i++)
    {
        scanf("%d %d %d",&x,&y,&z);
        v[x-1].push_back({y-1,z});
    }

    for(int i=0; i<m; i++) dist[i]=inf;
    dist[0]=0;

    toupdate.push(0);

    while(!toupdate.empty())
    {
        int nod=toupdate.front();
        toupdate.pop();
        int size;
        size=v[nod].size();
        for(int i=0; i<size; i++)
        {
            if(v[nod][i].cost+dist[nod]<dist[v[nod][i].nod])
            {
                toupdate.push(v[nod][i].nod);
                dist[v[nod][i].nod]=v[nod][i].cost+dist[nod];
                checked[v[nod][i].nod]++;
                if(checked[v[nod][i].nod]>=n)
                    {
                        printf("Ciclu negativ!");
                    return 0;
                    }
            }
        }
    }
    for(int i=1; i<n; i++)
        if(dist[i]==inf) printf("0 ");
        else printf("%d ",dist[i]);
}