Cod sursa(job #2120167)

Utilizator nicu_serteSerte Nicu nicu_serte Data 1 februarie 2018 23:42:50
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.95 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
#define nmax 100005
int n, m, s, d[nmax];
vector<int> g[nmax];
queue<int> q;
bool viz[nmax];
void citire()
{
    int i, x, y;
    fin>>n>>m>>s;
    for(i=1; i<=m; i++)
    {
        fin>>x>>y;
        g[x].push_back(y);
    }
    fin.close();
}
void bfs(int nod)
{
    int i, k;
    vector<int>::iterator it;
    viz[nod]=1;
    q.push(nod);
    for(i=1; i<=n; i++)
        d[i]=-1;
    d[nod]=0;
    while(!q.empty())
    {
        k=q.front();
        q.pop();
        for(it=g[k].begin(); it!=g[k].end(); it++)
            if(!viz[*it])
            {
                q.push(*it);
                viz[*it]=1;
                d[*it]=d[k]+1;
            }
    }
}
void afisare()
{
    int i;
    for(i=1; i<=n; i++)
        fout<<d[i]<<' ';
    fout<<'\n';
    fout.close();
}
int main()
{
    citire();
    bfs(s);
    afisare();
    return 0;
}