Cod sursa(job #3203334)

Utilizator alexandraiacobelAlexandra Iacob alexandraiacobel Data 13 februarie 2024 15:29:38
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream cin("bfs.in");
ofstream cout("bfs.out");
vector<int> L[100001];
int d[100001]; //initializat tot ca -1
queue<int> q;
int n,m,s,i,j;
bool viz[100001];

void bfs()
{
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int vec: L[nod])
        {
            if(!viz[vec])
            {
                viz[vec]= 1;
                q.push(vec);
                //debug cout<<vec<<' ';
                d[vec]=d[nod]+1;
            }
        }
    }
}
int main()
{
    cin>>n>>m>>s;
    while(m--)
    {
        cin>>i>>j;
        L[i].push_back(j); //ca e orientat
    }
    q.push(s);
    for(i=1;i<=n;i++)
    {
        d[i]=-1;
    }
    d[s]=0;
    viz[s]=1;
    bfs();
    for(i=1; i<=n;i++)
        cout<<d[i]<<' ';
    return 0;
}