Cod sursa(job #3212525)

Utilizator gabriel.9619Gabriel Stefan Tita gabriel.9619 Data 11 martie 2024 20:57:14
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");

int viz[100001], q[100001];
vector <int> l[100001];

int main()
{
    int n, m, start, x, y;
    fin>>n>>m>>start;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        l[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
    {
        viz[i]=-1;
    }
    int p=1,u=1;
    q[1]=start;
    viz[start]=1;
    while(p<=u)
    {
        int nod=q[p];
        p++;
        for(int i=0;i<l[nod].size();i++)
        {
            int vecin=l[nod][i];
            if(viz[vecin]<0)
            {
                u++;
                viz[vecin]=viz[nod]+1;
                q[u]=vecin;
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        if(viz[i]>0)
        {
            fout<<viz[i]-1<<" ";
        }
        else
        {
            fout<<viz[i]<<" ";
        }
    }
}