Cod sursa(job #3258060)

Utilizator Alez11jokler Alez11 Data 20 noiembrie 2024 18:32:07
Problema BFS - Parcurgere in latime Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.91 kb
#include <fstream>
#include <set>
#include <queue>

using namespace std;
const string task("bfs");
ifstream cin(task+".in");
ofstream cout(task+".out");
int n,m,s;
set<int> a[100001];
int v[100001];
struct quee
{
    int x,y;
};
queue <int> q;
int main()
{
    cin>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        cin>>x>>y;
        a[x].insert(y);

    }
    v[s]=0;
    q.push(s);
    while(!q.empty())
    {
        int n=q.front();
        q.pop();
        for(set<int>::iterator it=a[n].begin(); it!=a[n].end(); it++)
        {
           if(v[*it]==0 && *it!=s)
           {
               v[*it]=v[n]+1;
               q.push(*it);
           }

        }
    }
    for(int i=1;i<=n;i++)
    {
        if(v[i]==0 && i!=s)
        {
         cout<<-1<<" ";
        }
        else
        {
            cout<<v[i]<<" ";
        }
    }


    return 0;
}