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Cod sursa(job #671528)
#include <fstream>
#include <vector>
using namespace std;
const int maxn=40100;
int viz[maxn],c[maxn],k,n,m,i,x,y;
long long cost[maxn];
vector <int> A[maxn];
ifstream f("bfs.in");
ofstream g("bfs.out");
void citire()
{
int x,y,i;
f>>n>>m>>k;
for(i=1;i<=n;i++)
{
f>>x>>y;
A[x].push_back(y);
}
g.close();
}
void bfs(int k)
{
int li,ls,i,nod,NV;
li=1;
ls=1;
c[li]=k;
viz[k]=1;
while(li<=ls)
{
nod=c[li];
NV=A[nod].size();
for(i=0;i<NV;i++)
if(viz[A[nod][i]]==0)
{
ls++;
c[ls]=A[nod][i];
viz[A[nod][i]]=1;
cost[A[nod][i]]=cost[nod]+1;
}
li++;
}
}
int main()
{
int i;
citire();
bfs(k);
for(i=1;i<=n;i++)
if(cost[i]!=0||i==k)
g<<cost[i]<<" ";
else
g<<-1<<" ";
g.close();
return 0;
}