Cod sursa(job #2486866)

Utilizator SurduTonySurdu Tony SurduTony Data 3 noiembrie 2019 16:51:01
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.89 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");
int N, M, S;
vector <int> vecini[100001];
queue <int> coada;
int dist[100001];

int main()
{
    fin >> N >> M >> S;

    int x, y;
    for(int i=0; i<M; i++) {
        fin >> x >> y;
        vecini[x].push_back(y);
    }

    for(int i=1; i<=N; i++)
        dist[i] = -1;

    coada.push(S);
    dist[S] = 0;

    int nod;
    while(!coada.empty()) {
        nod = coada.front();
        coada.pop();

        for(int i=0; i<vecini[nod].size(); i++) {
            int Vecin = vecini[nod][i];
            if(dist[Vecin] == -1) {
                dist[Vecin] = dist[nod] + 1;
                coada.push(Vecin);
            }
        }
    }

    for(int i=1; i<=N; i++)
        fout << dist[i] << ' ';

    return 0;
}