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  1. #include <stdio.h>
  2.  
  3. int b(int n) {
  4.     if(n==0){
  5.     	return 5;
  6.     }else{
  7.     	return b(n-1)+6;
  8.     }
  9. }
  10.  
  11. int a(int n){
  12.     if(n==0){
  13.     	return 2;
  14.     }else if(n==1){
  15.     	return 7;
  16.     }else{
  17.     return a(n-1)+b(n-1);    	
  18.     }
  19. }
  20.  
  21. int main(void) {
  22.     int n;
  23.     scanf("%d", &n);
  24.     if(n<0){
  25.         printf("書き直し\n");
  26.     }else{
  27.         printf("%d\n",a(n));
  28.     }
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/A92n8d
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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