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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int c;
  4. int rec(int n){
  5. 	c++;
  6. 	if (n == 1){return 1;}
  7. 	else if (n == 2){return 2;}
  8. 	else{return -6*rec(n-1) - 9*rec(n-2);}
  9. }
  10.  
  11. int main(void) {
  12.     int n = 5;
  13.     printf("数列a%dの値は%d\n", n, rec(n));
  14.     printf("このときrecの呼び出し回数は%d\n", c);
  15. 	return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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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/IVD40x
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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