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  1. #include <stdio.h>
  2. int c = 0;
  3. int rec(int n) {
  4.     c++; 
  5.  
  6.     if (n == 1){
  7.         return 1;
  8.     }
  9.     else if (n == 2){
  10.         return 2;
  11.     }
  12.     else{
  13.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  14.     }
  15. }
  16.  
  17. int main(void) {
  18.     int n=5;
  19.     scanf("%d", &n);
  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 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/jHsoLa
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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