Cod sursa(job #1630842)

Utilizator Bijoux12Andreea Gae Bijoux12 Data 5 martie 2016 11:38:22
Problema Parcurgere DFS - componente conexe Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.98 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

int n,m,s;
vector <vector<int> > graph;
vector <int> visited;

void bfs(int vertex)
{
    if(vertex<0 || vertex>n-1)
        return;
    queue<int> q;
    unsigned int element,i,prev;
    q.push(vertex);
    visited[vertex]=0;
    while(!q.empty())
    {
        element=q.front();
        for(i=0;i<graph[element].size();i++)
            if(visited[graph[element][i]]==-1)
        {
            q.push(graph[element][i]);
            visited[graph[element][i]]=visited[element]+1;
        }
        q.pop();
    }
}

int main()
{
    f>>n>>m>>s;
    s--;
    graph.resize(n);
    visited.resize(n,-1);
    int x,y,i;
    for(i=0;i<m;i++)
    {
        f>>x>>y;
        x--;
        y--;
        graph[x].push_back(y);
    }
    bfs(s);
    for(i=0;i<n;i++)
        g<<visited[i]<<" ";
    return 0;
}