Cod sursa(job #2547227)

Utilizator Bru_2_sBercia Razvan Bru_2_s Data 15 februarie 2020 10:14:56
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

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

vector<int> v[100005];
queue<int> q;
int n,m,s,x,y,d[100005],viz[100005];

void bfs(int s)
{
    int i,j;
    q.push(s);
    for(i=1; i<=n; i++)
    {
        d[i]=-1;
    }
    d[s]=0;
    viz[s]=1;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(i=0; i<v[nod].size(); i++)
        {
            if(!viz[v[nod][i]])
            {
                q.push(v[nod][i]);
                d[v[nod][i]]=d[nod]+1;
                viz[v[nod][i]]=1;
            }
        }
    }
}

int main()
{
    int i;
    in>>n>>m>>s;
    for(i=1; i<=m; i++)
    {
        in>>x>>y;
        v[x].push_back(y);
    }
    bfs(s);
    for(i=1; i<=n; i++)
    {

        out<<d[i]<<" ";
    }
    return 0;
}