Cod sursa(job #2545912)

Utilizator cookieAndreea L. cookie Data 13 februarie 2020 17:49:04
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.08 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

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

int n, m, s, dist[100005];
vector<int> gr[100005];

queue <int> q;

int main() {
    fin >> n >> m >> s;
    int x;
    for (int i = 0; i < m; i++) {
        int a, b;
        fin >> a >> b;
        gr[a].push_back(b);
    }
    q.push(s);
    for (int i = 0; i <= n; i++) {
        dist[i] = -1;
    }
    dist[s] = 0;
    while (!q.empty()) {
        int nod = q.front();
        for (int j = 0; j < gr[nod].size(); j++) {
            if (dist[gr[nod][j]] == -1) {
                q.push(gr[nod][j]);
                dist[gr[nod][j]] = dist[nod] + 1;
            }
        }
        q.pop();
    }
    for (int i = 1; i <= n; i++) {
        fout << dist[i] << " ";
    }
    return 0;
}
// queue
/*
    cout << "Vecini 2:\n";
    for (int i = 0; i < gr[s].size(); i++) {
        q.push(gr[s][i]);
        cout << gr[s][i] << " ";
    }
    */
/*
while(!q.empty()){
	cout<<" "<<q.front();
	q.pop();
}
*/