Cod sursa(job #1921790)

Utilizator VictoriaNevTascau Victoria VictoriaNev Data 10 martie 2017 14:29:19
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.03 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
const int NMAX=50001, inf=(1<<25);
vector< pair<int, int> > g[NMAX];
queue< int> q;
int vis[NMAX], d[NMAX], n, m;

int bellmanford()
{
    for(int i=2; i<=n; i++)
        d[i]=inf;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        vis[x]++;
        if(vis[x]>=n)
            return -1;
        for(vector< pair<int, int> >::iterator it=g[x].begin(); it!=g[x].end(); it++)
            if(d[it->first]>d[x]+it->second)
            {
                d[it->first]=d[x]+it->second;
                q.push(it->first);
            }
    }
    return 1;
}


int main()
{
    ifstream cin("bellmanford.in");
    ofstream cout("bellmanford.out");
    cin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int u, v, c;
        cin>>u>>v>>c;
        g[u].push_back(make_pair(v, c));
    }
    q.push(1);
    if(bellmanford()<0)
        cout<<"Ciclu negativ!";
    else
        for(int i=2; i<=n; i++)
            cout<<d[i]<<' ';

    return 0;
}