Cod sursa(job #2691906)

Utilizator emma.chirlomezEmma Chirlomez emma.chirlomez Data 30 decembrie 2020 17:46:54
Problema BFS - Parcurgere in latime Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1 kb
#include <bits/stdc++.h>
using namespace std;

const int NMAX = 1000;
vector <int> adiacenta[NMAX];
int tata[NMAX];
bool vizitat[NMAX];
int dist[NMAX];

int main()
{
    ifstream in("bfs.in");
    ofstream out("bfs.out");
    int n, m, s;
    in >> n >> m >> s;
    for (int i = 0; i < m; i++) {
        int a, b;
        in >> a >> b;
        adiacenta[a].push_back(b);
    }

    queue <int> q;
    q.push(s);
    vizitat[s] = 1;
    tata[s] = -1;
    dist[s] = 0;

    while (!q.empty()){
        int nod = q.front();
        q.pop();
        for (int i = 0; i < (int)adiacenta[nod].size(); i++) {
            int fiu = adiacenta[nod][i];
            if (vizitat[fiu] == 0){
                q.push(fiu);
                tata[fiu] = nod;
                vizitat[fiu] = 1;
                dist[fiu] = dist[nod] + 1;
            }
        }
    }

    for (int i = 1; i <= n; i++) {
        if (vizitat[i] == 0)
            out << -1 << " ";
        else
            out << dist[i] << " ";
    }
    out << '\n';
    return 0;
}