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- #include <fstream>
- #include <algorithm>
- using namespace std;
- ifstream fin("nrnod.in");
- ofstream fout("nrnod.out");
- int nt[5001],n;
- struct nod
- {
- int info;
- nod * st, *dr;
- };
- void citire(nod * & p)
- {
- int x;
- fin>>x;
- if(x==0)
- p=NULL;
- else
- {
- p=new nod;
- p->info=x;
- citire(p->st);
- citire(p->dr);
- }
- }
- void preordine(nod * p)
- {
- if(p)
- {
- if((p->st&&!p->dr)||(!p->st&&p->dr))
- n++;
- preordine(p->st);
- preordine(p->dr);
- }
- }
- void stergeTot(nod * & p)
- {
- if(p!=NULL)
- {
- stergeTot(p->st);
- stergeTot(p->dr);
- delete p;
- p=NULL;
- }
- }
- int main()
- {
- nod * p = NULL;
- citire(p);
- preordine(p);
- fout<<n;
- stergeTot(p);
- return 0;
- }
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