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Cod sursa(job #553872)
#include <stdio.h>
#include<vector>
using namespace std;
const int N=100001;
int n,m,s;
vector <int> a[N];
int b[N],c[N],down,up;
void bfs(int nod)
{
for (int i=0;i<a[nod].size();i++)
if (b[a[nod][i]]==0&&a[nod][i]!=s)
{
b[a[nod][i]]=b[nod]+1;
c[++up]=a[nod][i];
}
}
int main()
{
int x,y;
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);
//a[y].push_back(x);
}
b[s]=0;
c[1]=s;down=1;up=1;
while (down<=up)
{
bfs(c[down]);
down++;
}
for(int i=1;i<=n;i++)
{
if (b[i]==0)
{
if (i==s) printf("0 ");
else printf("-1 ");
}
else printf("%d ",b[i]);
}
}