Cod sursa(job #2712644)

Utilizator AndiAndi39Sabo Andrei Claudiu AndiAndi39 Data 26 februarie 2021 10:44:33
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.03 kb
#include<iostream>
#include<fstream>
#include<vector>
#include<queue>

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

#define MAX 100005
vector<int>graf[MAX];
int dist[MAX];
int n,m,s;
queue<int>coada;

void read()
{
    fin>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        int x,y;
        fin>>x>>y;
        graf[x].push_back(y);
    }
}

void bfs()
{
    coada.push(s);
    while(!coada.empty())
    {
        int ant=coada.front();
        coada.pop();
        for(int i=0; i<graf[ant].size(); i++)
        {
            int nod=graf[ant][i];
            if(dist[nod]==-1)
            {
                coada.push(nod);
                dist[nod]=dist[ant]+1;
            }
        }
    }
}

void afisare()
{
    for(int i=1; i<=n; i++)
    {
        fout<<dist[i]<<" ";
    }
}
int main ()
{
    read();
    for(int i=1; i<=n; i++)
    {
        dist[i]=-1;
    }
    dist[s]=0;
    bfs();
    afisare();
    fin.close();
    fout.close();
    return 0;
}