Cod sursa(job #999337)

Utilizator muresan_bogdanMuresan Bogdan muresan_bogdan Data 19 septembrie 2013 22:22:54
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.17 kb
#include<iostream>
#include<fstream>
#include<vector>
#include<queue>
using namespace std;

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

struct nod {
    bool vizitat;
    vector<int> vecini;
};
struct cuplu {
    int cost;
    int pozitie;
};

int n, m, s, i, a, b, v[100002];
nod nodes[100002];
queue<cuplu> coada;
cuplu element;

void search(cuplu x) {
    int l, j;
    cuplu y;
    nodes[x.pozitie].vizitat = true;
    l = nodes[x.pozitie].vecini.size();
    for(j = 0; j < l; j++) {
        int vecin = nodes[x.pozitie].vecini[j];
        if(nodes[vecin].vizitat == false) {
            y.pozitie = vecin;
            y.cost = x.cost + 1;
            coada.push(y);
            v[y.pozitie] = y.cost;
        }
    }
}

int main() {
    fin >> n >> m >> s;
    for(i = 0; i < m; i++) {
        fin >> a >> b;
        nodes[a].vecini.push_back(b);
    }
    element.pozitie = s;
    element.cost = 1;
    coada.push(element);
    while(!coada.empty()) {
        search(coada.front());
        coada.pop();
    }
    for(i = 1; i <= n; i++) {
        fout << v[i] - 1 << ' ';
    }
    fin.close();
    fout.close();
    return 0;
}