Cod sursa(job #2143615)

Utilizator andrei32576Andrei Florea andrei32576 Data 26 februarie 2018 09:39:04
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;

int n,m,s,i,x,y;
int viz[100002],d[100002];
vector <int> G[100002];

struct nod
{
    int x,d;
};

queue <nod> q;

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

void bfs(int x)
{
    int i,vf;
    d[x]=0;
    q.push({x,0});
    while(!q.empty())
    {
        vf=q.front().x;
        for(i=0;i<G[vf].size();i++)
        {
            if(d[G[vf][i]]==-1)
            {
                d[G[vf][i]]=d[vf]+1;
                q.push({G[vf][i],d[G[vf][i]]});
            }
        }
        q.pop();
    }
}

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

    for(i=1;i<=n;i++)
        d[i]=-1;

    bfs(s);

    for(i=1;i<=n;i++)
        fout<<d[i]<<" ";

    fin.close();
    fout.close();
    return 0;
}