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  1. #include <stdio.h>
  2. int c=0;
  3. int rec(int n){
  4. c++;
  5. if(n==1){
  6. return 1;
  7. }
  8. else if(n==2){
  9. return 2;
  10. }
  11. else{
  12. return -6*rec(n-1)-9*rec(n-2);
  13. }
  14. }
  15. int main(void) {
  16. int n;
  17. scanf("%d",&n);
  18. printf("数列a%dの値は%d\n", n, rec(n));
  19. printf("このときrecの呼び出し回数は%d",c);
  20. return 0;
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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5
stdout
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数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/pe7Fuz
language:
C (gcc 8.3)
created:
73 days ago
visibility:
public

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