Cod sursa(job #1183321)

Utilizator radu_cebotariRadu Cebotari radu_cebotari Data 8 mai 2014 20:07:51
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include<fstream>
#include<vector>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
const int nmax = 100009;
vector<int> v[nmax];
int coada[nmax],cost[nmax],lg[nmax];

void bfs(int S)
{
    int i,j;
    for(i = 1 ; i <= 100000 ; i++)
       cost[i] = -1;
    int L = 1;
    coada[L] = S;
    cost[S] = 0;
    for(i = 1 ; i <= L ; i++)
        for(j = 0 ; j < lg[coada[i]]; j++)
            if(cost[v[coada[i]][j]] == -1)
            {

                 coada[++L] = v[coada[i]][j];
                 cost[coada[L]] = cost[coada[i]]+1;
            }
}

int main()
{

    int N,M,S,i,x,y;
    in>>N>>M>>S;
    for(i = 1 ; i <= M ; i++)
    {

        in>>x>>y;
        v[x].push_back(y);
    }
    for(i = 1 ; i <= N ; i++)
        lg[i] = v[i].size();
    bfs(S);
    for(i = 1 ; i <= N ; i++)
        out<<cost[i]<<" ";
    return 0;
}