Cod sursa(job #2016800)

Utilizator cristian_99Olaru Cristian cristian_99 Data 30 august 2017 14:14:35
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.25 kb
#include <iostream>
#include <vector>
#include <fstream>
#include <queue>
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

const int NodMax = 100005;
vector < int > v[NodMax];
queue < int > Q;

int n,m,s;
int dist[NodMax];

void citire ()
{
    fin>>n>>m>>s;
    for (int i=1; i<=m; ++i)
    {
        int a,b;
        fin>>a>>b;
        v[a].push_back(b);
    }
}

void distanta ()
{
    Q.push(s);
    dist[s]=1;
    while (!Q.empty())
    {

        int nod;
        nod=Q.front();
        vector < int > ::iterator it;
        for (it=v[nod].begin(); it!=v[nod].end(); ++it)
        if (!dist[*it])
            {
                Q.push(*it);
                dist[*it]=dist[nod]+1;
            }
        Q.pop();
    }
}

void afishare()
{
    for (int i=1;i<=n; i++)
        if (!dist[i]) fout<<"-1 ";
        else fout<<dist[i]-1<<" ";
}

int main()
{
//    for(int i=1; i<=100; ++i)
//        {
//            int x;
//            fin >> x;
//            v[i].push_back(x);
//        }
//
//    vector < int > ::iterator it;
//    for(it=v[i].begin(); it!=v[i].end(); ++it)
//    {
//        cout << *it;
//    }
    citire();
    distanta();
    afishare();



    return 0;
}