Cod sursa(job #2070994)

Utilizator DologXTurcas David Emil DologX Data 20 noiembrie 2017 08:11:22
Problema BFS - Parcurgere in latime Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.73 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

int n,m,s,x,y,b[100005];
vector <int> a[100005];
queue <int> q;

void bfs(int s)
{
    b[s]=1;
    q.push(s);
    while(!q.empty())
    {
        x=q.front();
        q.pop();
        for(int i=0;i<=a[x].size()-1;i++)
        {
            if(!b[a[x][i]])
            {
                q.push(a[x][i]);
                b[a[x][i]]=b[x]+1;
            }
        }
    }
}

int main()
{
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y;
        a[x].push_back(y);
    }
    bfs(s);
    for(int i=1;i<=n;i++)
        g<<b[i]-1<<' ';
    return 0;
}