Cod sursa(job #2884118)

Utilizator mjmilan11Mujdar Milan mjmilan11 Data 2 aprilie 2022 13:49:00
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <bits/stdc++.h>

using namespace std;

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

const int NMAX = 100005;
vector <int> v[NMAX];
int dist[NMAX];
int n,m,S,x,y;

void citire(){
    fin >> n >> m >> S;
    for(int i=1;i<=m;i++){
        fin >> x >> y;
        v[x].push_back(y);
    }
    return;
}

void bfs(){
    for(int i=1;i<=n;i++) dist[i]=-1;
    queue <int> q;
    q.push(S);
    dist[S]=0;
    while(!q.empty()){
        int node = q.front();
        q.pop();
        for(int i=0;i<v[node].size();i++){
            int vecin=v[node][i];
            if(dist[vecin]==-1){
                dist[vecin]=dist[node]+1;
                q.push(vecin);
            }
        }
    }
}

void afis(){
    for(int i=1;i<=n;i++)
        fout << dist[i] << ' ';
    return;
}

int main()
{
    citire();
    bfs();
    afis();
    return 0;
}