Cod sursa(job #1110343)

Utilizator andreiseiceanSeicean Andrei andreiseicean Data 17 februarie 2014 23:24:39
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.76 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

vector <int> v[100010];
queue <int> q;
int n,m,s,viz[100010],dist[100010],d;

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

void citeste(){
int i,x,y;
f>>n>>m>>s;
for (i=1;i<=m;i++){
    f>>x>>y;
    v[x].push_back(y);
}
}

void bfs(int s){
int x;
q.push(s);
viz[s]=1;
while (!q.empty()) {
  x=q.front();
  q.pop();
  for ( unsigned i=0;i<v[x].size();i++)
    if (viz[v[x][i]]==0) {
        q.push(v[x][i]);
        viz[v[x][i]]=1;
        dist[v[x][i]]=dist[x]+1;
    }
}
}

void afisare(){
int i;
for (i=1;i<=n;i++)
  if ((dist[i]!=0)&&(i!=s)) g<<dist[i]<<' ';
    else if (i==s) g<<0<<' '; else g<<-1<<' ';
}

int main(){
citeste();
bfs(s);
afisare();
}