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Cod sursa(job #395675)
#include<stdio.h>
#include <vector>
using namespace std;
#define N 1<<17
int n,m,s,d[N],coada[N];
vector<int> a[N];
void bfs()
{
int p,u,x,y,i;
d[s]=0;
p=u=0;
coada[u++]=s;
while(p!=u)
{
x=coada[p++];
for(i=0;i<a[x].size();++i)
{
y=a[x][i];
if(d[y]==-1)
{
d[y]=d[x]+1;
coada[u++]=y;
}
}
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
int i,x,y;
scanf("%d%d%d", &n,&m,&s);
for(i=1;i<=m;++i)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
for(i=1;i<=n;++i)
d[i]=-1;
bfs();
for(i=1;i<=n;++i)
printf("%d ",d[i]);
return 0;
}