Cod sursa(job #3321670)

Utilizator Tudor_11Tudor Ioan Calin Tudor_11 Data 10 noiembrie 2025 21:46:45
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int> v[100001];
void bfs(int x,int s,int n)
{
    vector<bool> aux(n+5,0);
    queue<int> Q;
    Q.push(s);
    int cnt=0;
    bool ok=0;
    while(!Q.empty())
    {
        int node=Q.front();
        Q.pop();
        if(node==x)
        {
            ok=1;
            break;
        }
        for(auto it:v[node])
        {
            if(aux[it]==0)
            {
                aux[it]=1;
                cnt++;
                Q.push(it);
            }
        }
    }
    if(!ok) fout<<"-1 ";
    else fout<<cnt-2<<' ';
}
int main()
{
    int n,m,s,x,y;
    fin>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
    {
        bfs(i,s,n);
    }
    return 0;
}