Cod sursa(job #1072491)

Utilizator StickmanLazar Alexandru Stickman Data 4 ianuarie 2014 15:49:57
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

vector <int> v[500001];
int n,m,cost[500001],x,y,c,q[500001];

void blf()
{
    int i, top=1;
    for(i=0; i<top; i++)
    {

        for(int k=0; k<v[q[i]].size(); k+=2)
        {

            if(cost[v[q[i]][k]]>cost[q[i]]+v[q[i]][k+1])
            {

                cost[v[q[i]][k]]=cost[q[i]]+v[q[i]][k+1];
                q[top]=v[q[i]][k];
                top++;
            }
        }

    }
}

int main()
{
    ifstream in("bellmanford.in");
    ofstream out("bellmanford.out");
    in>>n>>m;
    for(int i=0; i<m; i++)
    {
        in>>x>>y>>c;
        v[x].push_back(y);
        v[x].push_back(c);

    }
    in.close();
    for(int i=2; i<=n; i++)
    {
        cost[i]=99999;
    }
    q[0]=1;
    blf();
    for(int i=2; i<=n; i++)
    {
        out<<cost[i]<<" ";
    }
    out.close();
    return 0;
}