Cod sursa(job #2308653)

Utilizator HaesteinnSabau Florin Vlad Haesteinn Data 27 decembrie 2018 15:24:48
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

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

int visited[100002];
vector<int> adj[100002];
int n,m,s;


void bfs()
{
    queue<int> q;
    q.push(s);
    visited[s]=0;
    while(!q.empty())
    {
        int v=q.front();
     //   cout<<v<<" ";
        q.pop();
        for(int i=0;i<adj[v].size();i++)
        {
            if(visited[adj[v][i]]==-1)
            {
                q.push(adj[v][i]);
                visited[adj[v][i]]=visited[v]+1;
            }
        }
    }
}

int main()
{
    fin>>n>>m>>s;
    for(int i=0;i<m;i++)
    {
        int v1,v2;
        fin>>v1>>v2;
        adj[v1].push_back(v2);
       // adj[v2].push_back(v1);
    }
    for(int i=0;i<=n;i++)
        visited[i]=-1;
    bfs();
    for(int i=1;i<=n;i++)
        fout<<visited[i]<<" ";
    return 0;
}