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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 count;
  4. int rec(int n){
  5.  
  6. if(n==1){count++;
  7.  return 1;
  8. }
  9. else if(n==2){count++;
  10.  return 2;}
  11. else{count++;
  12. return -6*rec(n-1)-9*rec(n-2);
  13. }
  14.  
  15. }
  16.  
  17. int main(void) {
  18.     int n = 4;
  19.     printf("数列a%dの値は%d\n", n, rec(n));
  20. printf("このときのrecの呼び出し回数は%d",count);
  21. 	return 0;
  22. }
  23.  
  24.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a4の値は108
このときのrecの呼び出し回数は5
https://ideone.com/pChxKT
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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