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Cod sursa(job #741658)
#include<cstdio>
#include<queue>
#include<vector>
using namespace std;
const int N = 1<<17 ;
int d[N] , n , m , x , y , s;
vector <int> a[N];
queue <int> q;
void read()
{
freopen ( "bfs.in" , "r" , stdin );
freopen ( "bfs.out" , "w" , stdout );
scanf ( "%d %d %d" , &n, &m , &s );
for (int i=1 ; i<=m ; ++i )
{
scanf("%d%d" , &x , &y );
a[x].push_back(y);
}
q.push(s);
}
void init()
{
for(int i=0 ; i<N ; ++i)
d[i] = -1;
}
void solve()
{
d[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(d[y]==-1)
{
d[y] = 1 + d[x];
q.push(y);
}
}
}
for (int i=1 ; i<=n ; ++i )
printf("%d " , d[i]);
}
int main()
{
read();
init();
solve();
return 0;
}