Cod sursa(job #2858049)

Utilizator stefandutastefandutahoria stefanduta Data 26 februarie 2022 21:25:44
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
#include <vector>
#define NMAX 100005

using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");

int n, m, s, x, y;
int dist[NMAX];
vector <int> vecini[NMAX];
bool viz[NMAX];

void bfs(int i)
{
    viz[i] = 1;
    for (int j = 0; j < vecini[i].size(); ++j)
    {
        if (viz[vecini[i][j]] == 0 || dist[i] + 1 < dist[vecini[i][j]])
        {
            dist[vecini[i][j]] = dist[i] + 1;
            bfs(vecini[i][j]);
        }
    }
}

int main()
{
    int i;
    in >> n >> m >> s;
    for (i = 1; i <= m; ++i)
    {
        in >> x >> y;
        vecini[x].push_back(y);
    }
    bfs(s);
    for (i = 1; i <= n; ++i)
    {
        if (viz[i] == 0)
            out << -1 << " ";
        else
            out << dist[i] << " ";
    }
    return 0;
}