Cod sursa(job #2422370)

Utilizator mihaibisoceanuBisoceanu Mihai Cosmin mihaibisoceanu Data 18 mai 2019 15:46:44
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <iostream>
#include<vector>
#include<fstream>
#include<queue>
#define N 100001
using namespace std;

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

int n,m,s;

vector<vector<int> > G(N);

void citire()
{
    f>>n>>m>>s;
    for(int i=0;i<m;i++)
    {
        int a,b;
        f>>a>>b;
        G[a].push_back(b);
    }
}


bool *viz=new bool[N];
vector<int> d(N,-1);
void bfs(int sursa)
{
    queue<int> q;
    q.push(sursa);
    viz[sursa]=1;
    d[sursa]=0;
    while(!q.empty())
    {
        int nod=q.front();
        for(auto i:G[nod])
        {
            if(!viz[i])
            {
                d[i]=d[nod]+1;
                q.push(i);
               viz[i]=1;
            }
        }
        q.pop();
    }
}

int main()
{
    citire();
    bfs(s);
    for(int i=1;i<=n;i++)
        fout<<d[i]<<" ";
    return 0;
}