Cod sursa(job #1880230)

Utilizator RazvanatorHilea Razvan Razvanator Data 15 februarie 2017 17:07:28
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

#define N 100005

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

vector <int> a[N];
queue <int> coada;

int n,m,s,l;
int cost[N];

void bfs(int x)
{
    cost[x]=0;
    int nod;
    while (!coada.empty()) {
        nod=coada.front();
        coada.pop();
        for (int i=0;i<a[nod].size();i++) {
            if (cost[a[nod][i]]==-1) {
                coada.push(a[nod][i]);
                cost[a[nod][i]]=cost[nod]+1;
            }
        }
        nod=coada.front();
    }
}

int main()
{
    fin>>n>>m>>s;
    int x,y;
    for (int i=0;i<m;i++) {
        fin>>x>>y;
        a[x].push_back(y);
    }
    for (int i=1;i<=n;i++) cost[i]=-1;
    for (int i=1;i<=n;i++) {
        coada.push(s);
        bfs(s);
    }
    for (int i=1;i<=n;i++) fout<<cost[i]<<' ';
}