Cod sursa(job #1884628)

Utilizator dragosmdvMoldovan Dragos dragosmdv Data 18 februarie 2017 22:42:03
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp Status done
Runda Arhiva educationala Marime 1.06 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");

int n, m, i, a, b, c, cost[50010], aux,freq[50010];
pair <int, int > pp, x;
vector < pair<int,int> > v[50010];
queue <int>q;
int main()
{
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {
        fin>>a>>b>>c;
        v[a].push_back(make_pair(b,c));
    }
    for(i=2;i<=n;i++)
        cost[i]=1<<30;
    q.push(1);

    while(!q.empty()){
            if(freq[q.front()]==n)
               return 0;
        aux=q.front();
        q.pop();
        for( i=0;i<v[aux].size();i++)
        {
            x=v[aux][i];
            if(cost[x.first]>cost[aux]+x.second)
            {
                cost[x.first]=cost[aux]+x.second;
                q.push(x.first);
                freq[x.first]++;
            }

        }

    }

    for( i=2;i<=n;i++)
       {
        if(cost[i]==1<<30)
            fout<<0<<" ";
        else
       fout<<cost[i]<< " " ;
       }

    return 0;
}