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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. void go(int x){
  4. 	if(x==0) return;
  5. 	cout<<x<<' ';
  6. 	go(x-1);
  7. 	cout<<x<<' ';
  8. }
  9. int main(){
  10. 	ios::sync_with_stdio(0); cin.tie(0);
  11. 	int n; cin>>n;
  12. 	go(n);
  13. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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5
stdout
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5 4 3 2 1 1 2 3 4 5
https://ideone.com/1bZxFp
5
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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