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- #include <iostream>
- using namespace std;
- void f(int n);
- void del(int n)
- {
- if(n > 0){
- del(n-2);
- cout<<-n<<" ";
- f(n-2);
- del(n-1);
- }
- }
- void f(int n)
- {
- if(n > 0)
- {
- f(n-1);
- del(n-2);
- cout<<n<<" ";
- f(n-2);
- }
- }
- int main(){
- int n;
- cin>>n;
- f(n);
- return 0;
- }
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