Cod sursa(job #2259434)

Utilizator aturcsaTurcsa Alexandru aturcsa Data 13 octombrie 2018 12:29:04
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.73 kb
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> A[100001];
int n,m,p;
int R[100001];
void bfs(int nod,int k)
{
    R[nod]=k;
    int g=A[nod].size();
    for(int i=0;i<g;i++)
    {
        int s=A[nod][i];
        if(R[nod]+1<R[s])
            bfs(s,R[nod]+1);
    }
}
int main()
{
    fin>>m>>n>>p;
    for(int i=1;i<=n;i++)
    {
        int a,b;
        fin>>a>>b;
        A[a].push_back(b);
    }
    for(int i=1;i<=n;i++)
        R[i]=1000000001;
    bfs(p,0);
    for(int i=1;i<=m;i++)
    {
        if(R[i]==1000000001)
            fout<<-1<<" ";
        else
        fout<<R[i]<<" ";
    }
    return 0;
}