Cod sursa(job #1992966)

Utilizator VarticeanNicolae Varticean Varticean Data 21 iunie 2017 23:57:37
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <vector>
#include <queue>
#define nmax 100010
using namespace std;
       ifstream in("bfs.in");
       ofstream out("bfs.out");
int start,m,n;
int cost[nmax]; vector <int> v[nmax];
queue <int> coada;
void bfs( int start)
{
    int i,j;
    for(i=1; i<=n; i++ )
       cost[i]=-1;
    coada.push(start);
     cost[start]=0;
    while( !coada.empty() ){
        int L=coada.front();
        coada.pop();
        for( j=0; j<v[L].size(); j++)
        if (cost[v[L][j]] == -1)
            {
                coada.push(v[L][j]);
                cost[v[L][j]] = cost[L] + 1;
            }
    }

}
int main()
{
    int i,j,x,y;
    in>>n>>m>>start;
    for( i=1; i<=m; i++)
    {
        in>>x>>y;
        v[x].push_back(y);
    }
    bfs(start);
    for( i=1; i<=n; i++)
        out<<cost[i]<<' ';
    out<<'\n';
    return 0;
}