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  1. #include <stdio.h>
  2.  
  3.  
  4. int c = 0;
  5.  
  6.  
  7. int rec(int n) {
  8.     c++; 
  9.     if (n == 1) return 1;
  10.     if (n == 2) return 2;
  11.     return -6 * rec(n - 1) - 9 * rec(n - 2);
  12. }
  13.  
  14. int main(void) {
  15.     int n = 5;
  16.  
  17.  
  18.     printf("数列a%dの値は%d\n", n, rec(n));
  19.  
  20.  
  21.     printf("このときrecの呼び出し回数は%d\n", c);
  22.  
  23.     return 0;
  24. }
Success #stdin #stdout 0.01s 5288KB
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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/4z7B18
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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