Cod sursa(job #1324034)

Utilizator StickmanLazar Alexandru Stickman Data 21 ianuarie 2015 18:53:13
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.85 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

vector <int> v[100001];
queue <int> q;
int cost[100001];
int s, n, m, x ,y;

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

void bfs()
{
    cost[s]=0;
    q.push(s);
    while(!q.empty())
    {
        int nod;
        nod = q.front();
        for(int k=0; k<v[nod].size(); k++)
        {
            if(cost[v[nod][k]]==-1)
            {
                cost[v[nod][k]]=cost[nod]+1;
                q.push(v[nod][k]);
            }
        }
        q.pop();
    }
}

int main()
{
    in>>n>>m>>s;
    for(int i = 0; i<m; i++)
    {
        in>>x>>y;
        v[x].push_back(y);
    }
    for(int i = 1; i<=n; i++)
        cost[i]=-1;
    bfs();
    for(int i = 1; i<=n; i++)
        out<<cost[i]<<" ";
    return 0;
}