Cod sursa(job #1348048)

Utilizator roparexRoparex roparex Data 19 februarie 2015 14:47:15
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
using namespace std;
vector<int> v[100001];
queue<pair<int,int> > q;
int n,m,s,x,y,viz[100001],i;
pair<int,int> aux;
int main()
{
    fin>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    q.push(make_pair(s,0));
    while(!q.empty())
    {
        aux=q.front();
        q.pop();
        for(vector<int>::iterator j=v[aux.first].begin();j!=v[aux.first].end();j++)
        {
            if(viz[(*j)]==0)
            {
            viz[(*j)]=aux.second+1;
            q.push(make_pair((*j),aux.second+1));
            }
        }
    }
    viz[s]=0;
    for(i=1;i<=n;i++)
        if(viz[i]!=0||i==s) fout<<viz[i]<<' ';
    else fout<<-1<<' ';
    return 0;
}