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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. int rec(int n) {
  6. 	c++;
  7.  
  8. 	if(n == 1) {
  9. 		return 1;
  10. 	}
  11.  
  12. 	else if(n == 2) {
  13. 		return 2;
  14. 	}
  15.  
  16. 	else {
  17. 		return -6*rec(n-1) -9*rec(n-2);
  18. 	}
  19. }
  20.  
  21. int main(void) {
  22. 	int n = 5;
  23.  
  24. 	printf("数列a &dの値は%d\n", n, rec(n));
  25. 	printf("このときrecの呼び出し回数は%d\n", c);
  26.  
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 5316KB
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Standard input is empty
stdout
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数列a &dの値は5
このときrecの呼び出し回数は9
https://ideone.com/RYyRG0
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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