Cod sursa(job #2801602)

Utilizator VladdalVVasile Vlad Raul VladdalV Data 16 noiembrie 2021 17:15:49
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.94 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

int n, m, s;

vector<int>viz;
vector<int>G[100005];
vector<int>d;

void bfs(int nod, int cc)
{
    queue<int>q;
    q.push(nod);
    viz[nod]=cc;
    d[nod]=0;
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(int j=0; j<G[nod].size(); j++)
        {
            int nod_viz=G[nod][j];
            if (viz[nod_viz]==0)
            {
                viz[nod_viz]=cc ;
                d[nod_viz]=d[nod]+1;
                q.push(nod_viz);
            }
        }
    }
}

int main()
{
    int x, y;
    fin>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        fin>>x>>y;
        G[x].push_back(y);
    }
    viz.assign(n+1, 0);
    d.assign(n+1, -1);
    bfs(s, 1);
    for(int i=1 ;i<=n ;i++)
        fout<<d[i]<<" ";
    return 0;
}