Cod sursa(job #2776674)

Utilizator bombardieruuCristi Mihai bombardieruu Data 20 septembrie 2021 17:28:03
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.96 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

const int maxN=100000;
vector <int> G[maxN+5];
queue <int> q;
int nr_noduri, nr_muchii, sursa, d[maxN+5];

void citire()
{
    fin>>nr_noduri>>nr_muchii>>sursa;
    for(int i=1; i<=nr_muchii; i++)
    {
        int a, b;
        fin>>a>>b;
        G[a].push_back(b);
    }
}

void bfs()
{
    d[sursa]=1;
    q.push(sursa);
    while(!q.empty())
    {
        int poz=q.front();
        q.pop();
        for(int i=0; i<G[poz].size(); i++)
        {
            int vecin=G[poz][i];
            if(d[poz]+1 < d[vecin] || d[vecin]==0)
            {
                d[vecin]=d[poz]+1;
                q.push(vecin);
            }
        }
    }
}

void afisare()
{
    for(int i=1; i<=nr_noduri; i++)
        fout<<d[i]-1<<' ';
}

int main()
{
    citire();
    bfs();
    afisare();
    return 0;
}