Cod sursa(job #2422574)

Utilizator WoodsOfYpresAdora Vivos WoodsOfYpres Data 19 mai 2019 12:05:33
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

vector <int> graf[100005];
queue <int> coada;
int viz[100005];
int dist[100005];
void BFS(int S, int N)
{
    int nod,lim,vecin;
    viz[S]=1;
    coada.push(S);
    while(coada.empty()==0)
    {
        nod=coada.front();
        coada.pop();
        lim=graf[nod].size();
        for(int i=0;i<lim;i++)
        {
            vecin=graf[nod][i];
            if(viz[vecin]==0)
            {
                coada.push(vecin);
                viz[vecin]=1;
                dist[vecin]=dist[nod]+1;
            }
        }
    }
}
int main()
{
    ifstream in("bfs.in");
    ofstream out("bfs.out");
    int N,M,S,i,x,y,c=0;
    in>>N>>M>>S;
    for(i=1;i<=M;i++)
    {
        in>>x>>y;
        graf[x].push_back(y);
    }
    BFS(S,N);
    for(i=1;i<=N;i++)
        if(dist[i]==0 && i!=S)
        dist[i]=-1;
    for(i=1;i<=N;i++)
        out<<dist[i]<<" ";
    return 0;
}