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Cod sursa(job #538952)
#include<fstream.h>
#define NM 100001
ifstream in("dfs.in");
ofstream out("dfs.out");
int c[NM],viz[NM],d[NM],n,m,start,li=1,ls;
struct nod{
int x;
nod *next;
};
nod *v[NM];
void add(nod* &l,int x){
nod *n=new nod;
n->x=x;
n->next=l;
l=n;
}
int c_vida(){return ls<li;}
void pune(int x){c[++ls]=x;}
void scoate(int &x){x=c[li++];}
void build(){
int i,a,b;
in>>n>>m>>start;
for(i=1;i<=m;i++){
in>>a>>b;
add(v[a],b);
}
}
void bf(int start){
int a,b;
nod *nc;
pune(start);viz[start]=1;
while(!c_vida()){scoate(a);
nc=v[a];
while(nc){b=nc->x;
if(!viz[b]){pune(b);viz[b]=1;
d[b]=d[a]+1;
}
nc=nc->next;
}
}
}
int main(){
int i;
build();
bf(start);
for(i=1;i<=n;i++) if(d[i]==0&&i!=start) d[i]=-1;
for(i=1;i<=n;i++) out<<d[i]<<" ";
return 0;
}