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Cod sursa(job #676757)
#include<fstream>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
int n,m,a[2600][2600],v[2600],c[2600],li=1,ls,d[2600],start;
void citire(){
int i,x,y;
in>>n>>m>>start;
for(i=1; i<=m; i++){
in>>x>>y;
a[x][y]=1;
}
}
void pune(int x){
ls++;
c[ls]=x;
}
void scoate(int &x){
x=c[li];
li++;
}
int coada_vida(){
if(li>ls)
return 1;
return 0;
}
void bf(int start){
v[start]=1;
pune(start);
while(!coada_vida()){
int x;
scoate(x);
for(int i=1; i<=n; i++)
if(a[x][i] and !v[i]){
v[i]=1;
pune(i);
d[i]=d[x]+1;
}
}
}
int main(){
citire();
bf(start);
for(int i=1; i<=n; i++)
if(d[i]==0 and i!=start)
d[i]=-1;
for(int i=1; i<=n; i++)
out<<d[i]<<" ";
return 0;
}