Cod sursa(job #3305350)

Utilizator MXelAMocanu Alexandru-Matei MXelA Data 31 iulie 2025 22:03:06
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.82 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

const int Nmax = 1e5+5;

vector<int> ad[Nmax];

int Dist[Nmax];

queue<int> q;

int n,m,s;

void bfs(int node);

int main()
{
    int i,a,b;
    fin>>n>>m>>s;
    for (i=1;i<=m;i++)
    {
        fin>>a>>b;
        ad[a].push_back(b);
    }
    bfs(s);
    for (i=1;i<=n;i++)
    {
        fout<<Dist[i]<<" ";
    }
    return 0;
}

void bfs(int node)
{
    int i;
    for (i=1;i<=n;i++)
    {
        Dist[i]=-1;
    }
    Dist[node]=0;
    q.push(node);
    while (!q.empty())
    {
        int org = q.front();
        q.pop();
        for (auto it : ad[org])
        {
            if (Dist[it]==-1)
            {
                Dist[it]=Dist[org]+1;
                q.push(it);
            }
        }
    }
}