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Cod sursa(job #228445)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
int w[100002],m,n,s;
vector <int> v[100002];
queue <int> q;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
void citire()
{
int x,y;
fin >> n >> m >> s;
for (int i=0; i<m; i++)
{
fin >> x >> y;
v[x].push_back(y);
}
}
void bfs()
{
int a;
while (!q.empty())
{
a=q.front();
q.pop();
for (vector <int> ::iterator it=v[a].begin(); it!=v[a].end(); it++)
if (w[*it]==-1)
{
q.push(*it);
w[*it]=w[a]+1;
}
}
}
int main()
{
memset(w, 0xff, sizeof(w));
citire();
w[s]=0;
q.push(s);
bfs();
for (int i=1; i<=n; i++)
fout << w[i] << " ";
return 0;
}