Cod sursa(job #1166079)

Utilizator PaueyPaula Nicoleta Gradu Pauey Data 3 aprilie 2014 10:59:24
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.8 kb
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
vector<int> v[10010];
int q[10010];
int cost[10010];

int main()
{
    ifstream in("bfs.in");
    ofstream out("bfs.out");
    int n, m, s, x, y;
    in>>n>>m>>s;
    for(int i=1; i<=m; ++i)
    {
       in>>x>>y;
       v[x].push_back(y);
    }
    int st=0,dr=0;
    for(int i=1;i<=n;++i) cost[i]=-1;
    cost[s]=0;
    q[st]=s;
          while(st<=dr)
          {
             for(int j=0; j<v[q[st]].size(); ++j)
             {
                if(cost[v[q[st]][j]]==-1)
                {++dr;
                q[dr]=v[q[st]][j];
                if(q[dr]!=q[st]) cost[q[dr]]=cost[q[st]]+1;}
             }
             ++st;
          }
    for(int i=1;i<=n;++i) out<<cost[i]<<" ";
    return 0;
}