Cod sursa(job #2886702)

Utilizator NutaAlexandruASN49K NutaAlexandru Data 8 aprilie 2022 09:22:47
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#import<fstream>
#import<vector>
#import<algorithm>
#import<cstring>
#import<queue>
using namespace std;
ifstream cin("bfs.in");
ofstream cout("bfs.out");
vector<vector<int>>a;
vector<int>sol;
void bfs(int x)
{
    queue<int>q;
    q.push(x);
    while(!q.empty())
    {
         for(auto c:a[q.front()])
         {
             if(sol[c]==0 && c!=x)
             {
                 sol[c]=sol[q.front()]+1;
                 q.push(c);
             }
         }
         q.pop();
    }
}
main()
{
    int n,m,s;
    cin>>n>>m>>s;
    a.resize(n+1);
    sol.resize(n+1);
    for(int i=0;i<m;i++)
    {
        int x,y;
        cin>>x>>y;
        a[x].push_back(y);
    }
    bfs(s);
    for(int i=1;i<=n;i++)
    {
        if(!sol[i] && i!=s)
        {
            sol[i]=-1;
        }
        cout<<sol[i]<<' ';
    }
}