Cod sursa(job #865521)

Utilizator ichigo2908mantu radu ichigo2908 Data 26 ianuarie 2013 16:49:30
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.86 kb
#include <fstream>
#include <queue>
#include <vector>
#define N_MAX 100001
using namespace std;

queue <int> q;
vector <int> v[N_MAX];
int dist[N_MAX], n, m, s;

int main()
{
    int iTemp1, iTemp2, x;
    ifstream in("bfs.in");
    ofstream out("bfs.out");

    in>>n>>m>>s;

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

    for(int i=0;i<m;i++)
    {
        in>>iTemp1>>iTemp2;
        v[iTemp1].push_back(iTemp2);
    }

    dist[s]=0;
    q.push(s);

    while(!q.empty())
    {
        x=q.front();
        q.pop();
        for(int i=0;i<v[x].size();i++)
        {
            if(dist[v[x][i]]==-1)
            {
                q.push(v[x][i]);
                dist[v[x][i]]=dist[x]+1;
            }
        }
    }

    for(int i=1;i<=n;i++)
        out<<dist[i]<<' ';

    in.close();
    out.close();

    return 0;
}