Cod sursa(job #3343821)

Utilizator Dragu_AndiDragu Andrei Dragu_Andi Data 28 februarie 2026 16:05:39
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <bits/stdc++.h>

using namespace std;

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

const int nmax=1e5 +1, mmax=1e6;
int N, M, S;

vector<int> G[nmax];
int drum[nmax];
queue<int> coada;

int main()
{
    fin >> N >> M >> S;
    int x, y;
    for(int i=0; i<M; i++)
    {
        fin >> x >> y;
        G[x].push_back(y);
    }
    for(int i=1; i<=N; i++)
        drum[i]=mmax;
    drum[S]=0;
    coada.push(S);
    while(!coada.empty())
    {
        for(auto i: G[coada.front()])
            if(drum[i]==mmax)
            {
                drum[i]=1+drum[coada.front()];
                coada.push(i);
            }
        coada.pop();
    }
    for(int i=1; i<=N; i++)
    {
        if(drum[i]==mmax)
            fout << -1 << ' ';
        else
            fout << drum[i] << ' ';
    }
    return 0;
}