Cod sursa(job #2342471)

Utilizator SamySam2099Irsai Samuel SamySam2099 Data 12 februarie 2019 20:46:48
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <vector>
#include <queue>
#include <fstream>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");

#define NMax 100005

vector <int> G[NMax];
queue <int>Q;
int D[NMax],n,m,s;
void read()
{
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        f>>x>>y;
        G[x].push_back(y);
        D[i]=-1;
    }
    D[s]=0;
}
void bfs()
{
    int nod,vecin;
    Q.push(s);
    while(!Q.empty())
    {
        nod = Q.front();
        Q.pop();
        for(int i=0;i<G[nod].size();i++)
        {
            vecin = G[nod][i];
            if(D[vecin] ==-1)
            {
                Q.push(vecin);
                D[vecin]=D[nod]+1;
                bfs();
            }
        }
    }
}
int main()
{
    read();
    bfs();
    for(int i=1;i<=n;i++)
        g<<D[i]<<' ';
    return 0;
}