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Cod sursa(job #780753)
#include <cstdio>
#include <vector>
using namespace std;
#define Max 100001
vector<int>g[Max];
int n,m,s,d[Max],c[Max];
bool was[Max];
void bfs(){
int p,u,x,y;
c[p = u = 1] = s;
d[s] = 0;
was[s] = 1;
while(p <= u)
{
x = c[p++];
for(int i=0;i<g[x].size();i++)
{
y = g[x][i];
if( !was[y] )
{
d[y] = d[x] + 1;
was[y] = 1;
c[++u] = y;
}
}
}
}
int main(){
int a,b;
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",&a,&b);
g[a].push_back(b);
}
bfs();
for(int i=1;i<=n;i++)
if(i == s)printf("0 "); else
if(d[i] == 0)printf("-1 ");else printf("%d ",d[i]);
return 0;
}