Cod sursa(job #2166461)

Utilizator alex.surdubobAlex Surdu alex.surdubob Data 13 martie 2018 17:15:17
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.82 kb
#include <fstream>
#include <vector>
#include <queue>
#include <string.h>
using namespace std;

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

vector<int> vecini[100010];
queue<int> q;

int d[100010];
//bool viz[100010];

int main()
{
    int n, m, s;
    fin >> n >> m >> s;
    for(int i = 0 ; i < m ; i++)
    {
        int a, b;
        fin >> a >> b;
        vecini[a].push_back(b);
    }
    memset(d, -1, 100009);
    d[s] = 0;
    q.push(s);
    while(!q.empty())
    {
        int t = q.front();
        q.pop();
        for(int i = 0 ; i < vecini[t].size(); i++)
        {
            if(d[vecini[t][i]] == -1)
            {
                d[vecini[t][i]] = d[t] + 1;
                q.push(vecini[t][i]);
            }
        }
    }
    for(int i = 1; i <= n; i++)
    {
        fout << d[i] << ' ';
    }

    return 0;
}