Cod sursa(job #2277556)

Utilizator SemetgTemes George Semetg Data 6 noiembrie 2018 15:28:40
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <fstream>
#include <vector>
using namespace std;

#define N_MAX 100005

ifstream cin{"bfs.in"};
ofstream cout{"bfs.out"};

int n, start;
vector<int> graf[N_MAX];
vector<int> d(N_MAX, -1);
int q[N_MAX];

void citeste() {
    int m;
    cin >> n >> m >> start;

    while (m--){
        int i, j;
        cin >> i >> j;
        graf[i].push_back(j);
    }
}

void BFS() {
    int stg = 0, drp = 0;
    q[stg] = start;
    d[start] = 0;

    for (; stg <= drp; ++stg) {
        int current = q[stg];

        for (auto& nod : graf[current])
            if (nod != start && d[nod] == -1) {
                d[nod] = d[current] + 1;
                q[++drp] = nod;
            }
    }
}

void afiseaza() {
    for (int i = 1; i <= n; ++i)
        cout << d[i] << ' ';
}

int main()
{
    citeste();
    BFS();
    afiseaza();
}