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Cod sursa(job #686646)
#include <fstream>
#include <queue>
#include <vector>
#include <iostream>
using namespace std;
ifstream in ("bfs.in");
ofstream out ("bfs.out");
int d[100020], S, M, N,x,y;
queue <int> q;
vector<int> a[100020];
void citire ()
{
int x,y;
for (int i=1;i<=M;i++)
{
in>>x>>y;
a[x].push_back(y);
}
}
void bfs(int S)
{
for ( int i=1; i<=N ; i++)
{
d[i]=-1;
}
q.push (S);
d[S] = 0;
while (!q.empty())
{
x = q.front ();
q.pop ();
for (int i=0; i<a[x].size() ; i++)
{
y = a[x][i];
if (d[y] == -1)
{
q.push (y);
d [y] = 1 + d [x];
}
}
}
}
int main ()
{
//cout << "aaaa\n";
in>>N>>M>>S;
citire ();
bfs (S);
for (int i=1; i<=N ; i++)
{
out<<d[i]<<" ";
}
return 0;
}