Cod sursa(job #1177131)

Utilizator andi23roscaRosca Andrei andi23rosca Data 26 aprilie 2014 11:47:41
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

#define maxn 100010

using namespace std;

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

vector<int> muchii[maxn];

queue<int> stiva;

int vizitati[maxn], cost[maxn];

void citire(int &n, int &m, int &s)
{
    int i,x,y;

    f>>n>>m>>s;

    for(i=1;i<=m;i++)
    {
        f>>x>>y;

        muchii[x].push_back(y);
    }
}

int main()
{
    int n,m,s,i,distanta=0,nod;

    vector<int>::iterator it;

    citire(n,m,s);
    stiva.push(s);

    while(!stiva.empty())
    {
        nod = stiva.front();
        vizitati[nod] = 1;
        distanta = cost[nod] + 1;
        stiva.pop();

        for(it = muchii[nod].begin(); it != muchii[nod].end(); it++)
        {
            if(vizitati[*it] != 1)
            {
                stiva.push(*it);
                cost[*it] = distanta;
            }
        }

    }

    for(i=1;i<=n;i++)
    {
        if(cost[i]==0 && i!=s) cout<<-1<<" ";
        else cout<<cost[i]<<" ";
    }


    return 0;
}