Cod sursa(job #1508701)

Utilizator TibixbAndrei Tiberiu Tibixb Data 22 octombrie 2015 21:13:17
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.34 kb
#include<fstream>
#include<vector>
#include<bitset>
#include<deque>
#define inf 2000000000
using namespace std;
vector < pair<int, int> > L[50003];
bitset<50003> v;
deque <int> q;
int n, m, i, x, y, z, D[50003], nr[50003], ok, nod, vecin;
void bellmanford()
{
    while(!q.empty() && !ok)
    {
        nod=*q.begin();
        for(int i=0; i<L[nod].size(); i++)
        {
            vecin=L[nod][i].first;
            if(D[vecin]>D[nod]+L[nod][i].second)
            {
                D[vecin]=D[nod]+L[nod][i].second;
                if(v[vecin]==0)
                {
                    q.push_back(vecin);
                    nr[vecin]++;
                    v[vecin]=1;
                    if(nr[vecin]==n)
                    {
                        ok=1;
                        break;
                    }
                }
            }
        }
        v[nod]=0;
        q.pop_front();
    }
}
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
int main()
{
    in>>n>>m;
    for(i=1; i<=m; i++)
    {
        in>>x>>y>>z;
        L[x].push_back(make_pair(y, z));
    }
    for(i=2; i<=n; i++)
        D[i]=inf;
    q.push_back(1);
    v[1]=1;
    nr[1]++;
    bellmanford();
    if(ok)
        out<<"Ciclu negativ!";
    else
        for(i=2; i<=n; i++)
            out<<D[i]<<" ";
}