Cod sursa(job #2701893)

Utilizator Bogdan.paun50Mandresi Bogdan Bogdan.paun50 Data 2 februarie 2021 02:45:13
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <fstream>
#include <vector>

using namespace std;

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

vector<int> l[100005];

int a[100005], n, m, i, start, c[100005], x, y;

void bfs(int nod)
{
    int p = 1, u = 1;
    c[1] = nod;
    a[nod] = 1;
    while(p <= u)
    {
        for(int i = 0; i < l[c[p]].size(); i++)
        {
            if(a[l[c[p]][i]] == 0)
            {
                a[l[c[p]][i]] = a[c[p]] + 1;
                u++;
                c[u] = l[c[p]][i];
            }
        }
        p++;
    }
}

int main()
{
    fin >> n >> m >> start;
    for(int i = 1; i <= m; i++)
    {
        fin >> x >> y;
        l[x].push_back(y);
    }

    bfs(start);

    for(int i = 1; i <= n; i++)
    {
        fout << a[i] - 1 << " ";
    }
    fout << "\n";
    return 0;
}