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Cod sursa(job #425654)
# include <algorithm>
# include <queue>
# include <vector>
using namespace std;
int n,m,s,x,y,i,a[100005];
vector <int> G[100005];
queue <int> Q;
void BF(int k)
{
int x;
vector <int>::iterator it;
fill(a+1,a+n+1,-1);
a[k]=0;
Q.push(k);
while (!Q.empty())
{
x=Q.front();
Q.pop();
for (it=G[x].begin();it!=G[x].end();it++)
if (a[*it]==-1)
{
a[*it]=a[x]+1;
Q.push(*it);
}
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d %d %d", &n, &m, &s);
for (; m; --m)
{
scanf("%d %d", &x, &y);
G[x].push_back(y);
}
BF(s);
for (i=1;i<=n;i++)
printf("%d ", a[i]);
return 0;
}