Cod sursa(job #3367063)

Utilizator Razvan23Razvan Mosanu Razvan23 Data 6 octombrie 2026 10:21:51
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.01 kb
#include <bits/stdc++.h>

void BFS(int k, const std::vector<std::vector<int>>& L, std::vector<int>& viz, std::vector<int>& dis)
{
    std::queue<int> q;
    viz[k] = 1;
    dis[k] = 0;
    q.push(k);
    while(!q.empty())
    {
        int x = q.front();
        q.pop();
        for(const auto& w: L[x])
            if(viz[w] == 0)
            {
                dis[w] = dis[x] + 1;
                viz[w] = 1;
                q.push(w);
            }
    }
}

int main()
{
    std::ifstream fin("bfs.in");
    std::ofstream fout("bfs.out");
    int N{}, M{}, x, y, P;
    fin >> N >> M >> P;
    std::vector<std::vector<int>> L(N+1);
    std::vector<int> viz(N+1, 0);
    std::vector<int> dis(N+1, 0);
    for(int i = 0; i < M; i++)
    {
        fin >> x >> y;
        L[x].push_back(y);
    }
    BFS(P, L, viz, dis);
    for(int i = 1; i <= N; i++)
        if(dis[i] == 0 && i != P) fout << "-1 ";
        else fout << dis[i] << " ";
    fin.close();
    fout.close();
    return 0;
}