Cod sursa(job #2783603)

Utilizator Horis21Horia Radu Horis21 Data 14 octombrie 2021 19:25:00
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <fstream>
#include <queue>
#include <vector>
#define N 100001

using namespace std;

ifstream in ("bfs.in");
ofstream out ("bfs.out");

vector<int> graph[N];
int d[N];
queue<int> q;

void bfs()
{
    while(!q.empty())
    {
        int x= q.front();
        q.pop();
        for(auto y: graph[x])
        {
            if(d[y]==-1)
            {
                d[y]=1+d[x];
                q.push(y);
            }
        }
    }

}

int main()
{
    int n,m,s,x,y;
    in >> n >> m >> s;
    for(int i=1; i<=n; i++)
    {
        d[i]=-1;
    }
    for(int i=0; i<m; i++)
    {
        in >> x >> y;
        graph[x].push_back(y);
        //graph[y].push_back(x);
    }
    q.push(s);
    d[s]=0;
    bfs();
    for(int i=1; i<=n; i++)
        out << d[i] << " ";
    return 0;
}