Cod sursa(job #3003414)

Utilizator gabriel.9619Gabriel Stefan Tita gabriel.9619 Data 15 martie 2023 18:37:23
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.91 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");

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

void bfs(int start)
{
    viz[start]=1;
    q.push(start);
    while(q.empty()==0)
    {
        int nod=q.front();
        q.pop();
        for(int i=0;i<l[nod].size();i++)
        {
            int vecin=l[nod][i];
            if(viz[vecin]==0)
            {
                viz[vecin]=viz[nod]+1;
                q.push(vecin);
            }
        }
    }
}

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