Cod sursa(job #3284308)

Utilizator Razvan23Razvan Mosanu Razvan23 Data 11 martie 2025 13:56:10
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.84 kb
#include <bits/stdc++.h>
using namespace std;

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

vector<int> L[100005];
bitset<100005> v;
int n, m, r;
queue<int> q;
int d[100005];

void BFS(int k)
{
    q.push(k);
    v[k] = 1;
    d[k] = 0;
    while(!q.empty())
    {
        k = q.front();
        q.pop();
        for(auto w : L[k])
            if(v[w] == 0)
            {
                d[w] = d[k] + 1;
                q.push(w);
                v[w] = 1;
            }
    }
}

int main()
{
    int i, x, y;
    fin >> n >> m >> r;
    for(i=1; i<=m; i++)
    {
        fin >> x >> y;
        L[x].push_back(y);
    }
    BFS(r);
    for(i=1; i<=n; i++)
        if(d[i] == 0 && i != r) fout << "-1 ";
        else fout << d[i] << " ";
    fin.close();
    fout.close();
    return 0;
}