Cod sursa(job #1810494)

Utilizator adu18sptAndrei Mircea adu18spt Data 20 noiembrie 2016 08:58:05
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.92 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

vector<int> v[100010];
int d[100010];
char vaz[100010];

void bfs(int nod)
{
    queue<int> q;
    q.push(nod);
    vaz[nod]=1;
    d[nod]=0;
    
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        
        for(int i=0;i<v[nod].size();i++)
            if(!vaz[v[nod][i]])
            {
                d[v[nod][i]]=d[nod]+1;
                
                vaz[v[nod][i]]=1;
                
                q.push(v[nod][i]);
            }
    }
}

int main()
{
    int n,m,nod,x,y;
    
    fin>>n>>m>>nod;
    
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        
        v[x].push_back(y);
    }
    bfs(nod);
    
    for(int i=1;i<=n;i++)
        if(!vaz[i]) fout<<"-1 ";
        else fout<<d[i]<<" ";
    return 0;
}