Cod sursa(job #2886172)

Utilizator NutaAlexandruASN49K NutaAlexandru Data 7 aprilie 2022 10:52:08
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.76 kb
#import<fstream>
#import<vector>
#import<algorithm>
#import<cstring>
using namespace std;
ifstream cin("bfs.in");
ofstream cout("bfs.out");
vector<vector<int>>a;
vector<int>sol;
void bfs(int x,const int rez)
{
    sol[x]=min(rez,sol[x]);
    for(auto c:a[x])
    {
        if(sol[c]==2e9)
        {
            bfs(c,rez+1);
        }
    }
}
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);
    }
    for(int i=1;i<=n;i++)
    {
        sol[i]=2e9;
    }
    bfs(s,0);
    for(int i=1;i<=n;i++)
    {
        if(sol[i]==2e9)
        {
            sol[i]=-1;
        }
        cout<<sol[i]<<' ';
    }
}