Cod sursa(job #2647760)

Utilizator xXoctavianXxStanescu Matei Octavian xXoctavianXx Data 6 septembrie 2020 12:44:57
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.82 kb
#include <bits/stdc++.h>

using namespace std;

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

const int nmax=100002;

int x,y,n,m,s;
vector<int> vecini[nmax];
queue<int> q;
int vizitat[nmax];

int main()
{
    fin>>n>>m>>s;
    for(int i=0; i<m; i++)
    {
        fin>>x>>y;
        vecini[x].push_back(y);
    }
    for(int i=0; i<=n; i++) vizitat[i]=-1;
    vizitat[s]=0;
    q.push(s);
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int i=0; i<vecini[nod].size(); i++)
        {
            int next_nod=vecini[nod][i];
            if(vizitat[next_nod]==-1)
            {
                q.push(next_nod);
                vizitat[next_nod]=vizitat[nod]+1;
            }
        }
    }
    for(int i=1; i<=n; i++) fout<<vizitat[i]<<" ";
    return 0;
}