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  1. #include <stdio.h>
  2.  
  3. int fn(int n){
  4.     if(n<=0){
  5.         printf("0");
  6.     }else{
  7.         printf("%d",n);
  8.         fn(n-2);
  9.         fn(n-1);
  10.         printf("%d",n);
  11.     }
  12. }
  13.  
  14. int main(void){
  15.     fn(2);
  16.     return 0;
  17. }
  18.  
  19.  
Success #stdin #stdout 0s 5316KB
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2010012
https://ideone.com/5zI3Cv
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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