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Cod sursa(job #305691)
#include <cstdio>
struct node{
node* next;
int id;
};
int main(){
freopen("bfs.in","rt",stdin);
freopen("bfs.out","wt",stdout);
int m,n,s;
node* v[100002];
int sel[100002];
int st[100002];
int cost[100002];
scanf("%d%d%d",&n,&m,&s);
int i,j;
node* tmp;
for(i=0;i<n;i++){
v[i]=NULL;
sel[i]=0;
cost[i]=-1;
}
for(i=0;i<m;i++){
int a,b;
scanf("%d%d",&a,&b);
tmp=new node;
tmp->id=b;
tmp->next=v[a];
v[a]=tmp;
}
int stl=1,l=0;
st[0]=s;
cost[s]=0;
sel[s]=1;
while(l<stl){
for(tmp=v[st[l]];tmp;tmp=tmp->next)
if(!sel[tmp->id]){
cost[tmp->id]=cost[st[l]]+1;
st[stl++]=tmp->id;
sel[tmp->id]=1;
}
l++;
}
for(i=1;i<=n;i++)
printf("%d ",cost[i]);
return 0;
}