Cod sursa(job #2740541)

Utilizator Uriesu_IuliusUriesu Iulius Uriesu_Iulius Data 13 aprilie 2021 14:54:42
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.82 kb
#include <bits/stdc++.h>

using namespace std;

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

int n, m, st;
vector<int> G[100001];
int d[100001];

void Citire()
{
    int i, j;
    fin >> n >> m >> st;
    for(int c=0; c<m; c++)
    {
        fin >> i >> j;
        G[i].push_back(j);
    }
    for(i=1; i<=n; i++)
        d[i]=-1;
}

void bfs(int st)
{
    queue<int> Q;
    int k;
    d[st]=0;
    Q.push(st);
    while(!Q.empty())
    {
        k=Q.front();
        Q.pop();
        for(int x : G[k])
            if(d[x]==-1)
            {
                d[x]=d[k]+1;
                Q.push(x);
            }
    }
}

void Afisare()
{
    int i;
    for(i=1; i<=n; i++)
        fout << d[i] << ' ';
}

int main()
{
    Citire();
    bfs(st);
    Afisare();
    return 0;
}