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  1. #include <stdio.h>
  2. int c=0;
  3.  
  4.  
  5. int rec(int n){
  6.     c++;  
  7.  
  8.     if(n == 1) return 1;
  9.     if(n == 2) return 2;
  10.  
  11.     return -6 * rec(n-1) - 9 * rec(n-2);
  12. }
  13.  
  14. int main(void) {
  15.     int n = 5;
  16.  
  17.     int ans = rec(n);
  18.     printf("数列a%dの値は%d\n", n, ans);
  19.     printf("このときrecの呼び出し回数は%d\n", c);
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5304KB
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stdin
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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/kQkeFO
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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