Cod sursa(job #1933307)

Utilizator GeorgeCalinPetruta George-Calin GeorgeCalin Data 20 martie 2017 16:49:42
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.89 kb
#include <fstream>
#include <vector>
#include <cstring>
#include <queue>
#define nma 100002;
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");

vector <int> v[100002];
queue <int> q;

int n,m,p,x,y,s;
int lg[100002];
short int fr[100002];

void bfs()
{
    fr[p]=1;
    while(!q.empty())
    {
        int k=q.front();
        q.pop();
        for(vector <int> :: iterator i=v[k].begin();i!=v[k].end();i++)
        {
            if(fr[*i]==0)
            {
                fr[*i]=1;
                lg[*i]=lg[k]+1;
                q.push(*i);
            }
        }
    }
}
int main()
{
    memset(lg,-1,sizeof(lg));
    fin>>n>>m>>p;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    q.push(p);
    lg[p]=0;
    bfs();
    for(int i=1;i<=n;i++)
    {
        fout<<lg[i]<<" ";
    }
    return 0;
}