Cod sursa(job #2384979)

Utilizator xXoctavianXxStanescu Matei Octavian xXoctavianXx Data 21 martie 2019 13:25:06
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.76 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> vecini[100005];
queue <int> q;

int d[100005],s,f,n,m;
void bfs(int nod)
{
    d[nod]=1;
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(int i=0; i<vecini[nod].size(); i++)
        {
            if(d[vecini[nod][i]]==0 || d[vecini[nod][i]]>d[nod]+1)
            {
                d[vecini[nod][i]]=d[nod]+1;
                q.push(vecini[nod][i]);
            }
        }
    }
}
int main()
{
    fin>>n>>m>>s;
    int x,y;
    for(int i=0; i<m; i++)
    {
        fin>>x>>y;
        vecini[x].push_back(y);
    }
    q.push(s);
    bfs(s);
    for(int i=1; i<=n; i++) fout<<d[i]-1<<" ";
}