Cod sursa(job #1324183)

Utilizator dariusmareCostolas Darius dariusmare Data 21 ianuarie 2015 22:20:52
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.97 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int N,M,S;
vector <int> g[100005];
queue <int> vecini;
int cost[100005];
void Read()
{
    fin >> N>>M>>S;
    for(int i=0; i<M; i++)
    {
        int x,y;
        fin >> x>>y ;
        g[x].push_back(y);
    }
}
void BFS()
{
    int nod = S;
    cost[nod] = 0;
    vecini.push(nod);
    while(!vecini.empty())
    {
        int actual = vecini.front();
        vecini.pop();
        for(unsigned int i=0; i<g[actual].size(); i++)
            if(cost[g[actual][i]] == -1)
            {
                cost[g[actual][i]] = cost[actual] + 1;
                vecini.push(g[actual][i]);
            }
    }
    for(int i=1; i<=N; i++)
        fout << cost[i] << " ";
}
void init()
{
    for(int i=1; i<=N; i++)
        cost[i] = -1;
}
int main()
{
    Read();
    init();
    BFS();
    return 0;
}