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Cod sursa(job #688707)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream in ("bfs.in");
ofstream out ("bfs.out");
int n, m, s, v[100001];
vector <int> a[100001];
queue <int> q;
void citire () {
in >> n >> m >> s;
int x,y;
for (int i = 1; i <= m; ++i) {
in >> x >> y;
a[x].push_back(y);
}
}
int main()
{
int x,y;
citire();
for (int i = 0;i<=n;i++)
v[i]=-1;
q.push(s);
v[s]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(size_t i=0; i<a[x].size();i++)
{
y=a[x][i];
if(v[y]==-1)
{
q.push(y);
v[y]=1+v[x];
}
}
}
for(int i=1;i<=n;i++)
out<<v[i]<<" ";
return 0;
}