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Cod sursa(job #457324)
#include <cstdio>
#include <cstring>
#include <deque>
using namespace std;
deque <int> coada;
int sol[100001],n,m,s,viz[100001];
struct nod {
int x;
nod *urm;
} *v[100001];
void adaugare(int x, int y) {//adaug varful y la varful x
nod *p;
p=new nod;
p->x=y;
p->urm=v[x];
v[x]=p;
}
void bfs(int dc) {
nod *p;
for( ;coada.size(); ) {
for(p=v[coada.front()]; p!=NULL; p=p->urm) {
if(!viz[p->x]) {
coada.push_back(p->x);
sol[p->x]=sol[coada.front()]+1;
}
}
viz[coada.front()]=1;
coada.pop_front();
}
}
int main()
{
int i,x,y;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
memset(sol,-1,sizeof(sol));
scanf("%d %d %d",&n, &m, &s);
for(i=0; i<m; i++) {
scanf("%d %d", &x, &y);
adaugare(x,y);
}
coada.push_back(s);
sol[s]=0;
viz[s]=1;
bfs(s);
for(i=1; i<=n; i++) printf("%d ", sol[i]);
return 0;
}