Mai intai trebuie sa te autentifici.
Cod sursa(job #1795186)
Utilizator | Data | 2 noiembrie 2016 07:51:47 | |
---|---|---|---|
Problema | BFS - Parcurgere in latime | Scor | 70 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.99 kb |
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
vector <int> L[100000];
int n, m, d[100000], s, viz[100000];
queue <int> q;
void initializare()
{
fin >> n >> m >> s;
int x, y;
for(int i=1;i<=m;i++)
{
fin >> x >> y;
L[x].push_back(y);
}
}
void BFS(int nod)
{
viz[nod]=1;
d[nod]=0;
q.push(nod);
while(!q.empty())
{
int val=q.front();
q.pop();
for(int i=0;i<L[val].size();i++)
{
int vecin=L[val][i];
if(viz[vecin]==0)
{
q.push(vecin);
d[vecin]=d[val]+1;
viz[vecin]=1;
}
}
}
}
int main()
{
initializare();
BFS(s);
for(int i=1;i<=n;i++)
{
if(d[i]>0 || i==s)
fout << d[i] << " ";
else
fout << "-1" << " ";
}
return 0;
}