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  1. #include <stdio.h>
  2. int c=0;
  3. int rec(int n) {
  4.  
  5. c++;
  6.  
  7. if(n==1){
  8. return 1;
  9. }
  10. else if(n==2){
  11. return 2;
  12. }
  13. else{
  14. return -6*rec(n-1)-9*rec(n-2);
  15. }
  16. }
  17.  
  18. int main (void){
  19. int n=5;
  20. scanf("%d",&n);
  21. printf("数列a%dの値は%d\n",n,rec(n));
  22. printf("この時recの呼び出し回数は%d\n",c);
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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数列a5の値は-459
この時recの呼び出し回数は9
https://ideone.com/7fpbh9
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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