Cod sursa(job #1035622)

Utilizator chiriacandrei25Chiriac Andrei chiriacandrei25 Data 18 noiembrie 2013 18:19:35
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;

vector <int> v[100001];
queue <int> q;

int d[100001],N,S;

inline void Read()
{
    int M,i,x,y;
    ifstream fin("bfs.in");
    fin>>N>>M>>S;
    for(i=1;i<=M;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    fin.close();
}

inline void Solve()
{
    int i,j,k;
    q.push(S);
    for(i=1;i<=N;i++)
        d[i]=-1;
    d[S]=0;
    while(!q.empty())
    {
        j=q.front();
        q.pop();
        for(i=0;i<v[j].size();i++)
        {
            k=v[j][i];
            if(d[k]<0)
            {
                d[k]=d[j]+1;
                q.push(k);
            }
        }
    }
}

int main()
{
    int i;
    Read();
    Solve();
    ofstream fout("bfs.out");
    for(i=1;i<=N;i++)
        fout<<d[i]<<" ";
    fout.close();
    return 0;
}