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  1. #include <stdio.h>
  2. int c = 0; 
  3.  
  4. int rec(int n){
  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.  
  21.     printf("数列a%dの値は%d\n", n, rec(n));
  22.     printf("このときrecの呼び出し回数は%d\n", c);
  23.  
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5304KB
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Standard input is empty
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/6LOdKM
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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