Cod sursa(job #1637969)

Utilizator edim98Eduard Constantinescu edim98 Data 7 martie 2016 20:14:21
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.96 kb
#include <bits/stdc++.h>
#define N 100000
using namespace std;

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

int n, m, s;
vector <int> Graf[N + 1];
int d[N + 1];
queue <int> Q;

void Add(int x, int y)
{
    Graf[x].push_back(y);
}

void Citire()
{
    int x, y;

    fin >> n >> m >> s;
    for(int i = 1; i <= m; i++)
    {
        fin >> x >> y;
        Add(x, y);
    }

}

void BFS()
{
    int nod, vecin;

    Q.push(s);
    d[s] = 1;

    while(Q.empty() == 0)
    {
        nod = Q.front();
        Q.pop();
        for(int i = 0; i < Graf[nod].size(); i++)
        {
            vecin = Graf[nod][i];
            if(d[vecin] == 0)
            {
                d[vecin] = d[nod] + 1;
                Q.push(vecin);
            }
        }
    }
}

void Afisare()
{
    for(int i = 1; i <= n; i++)
        fout << d[i]-1 << " ";
}

int main()
{
    Citire();
    BFS();
    Afisare();
    return 0;
}