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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. int rec(int n) {
  6.  
  7.     c++;
  8.  
  9.     if (n == 1) return 2;
  10.     if (n == 2) return 3;
  11.  
  12.     return 2 * rec(n - 1) + rec(n - 2);
  13. }
  14.  
  15. int main(void) {
  16.     int n = 5; 
  17.  
  18.     c = 0; 
  19.  
  20.     int result = rec(n);
  21.  
  22.     printf("数列a%dの値は%d\n", n, result);
  23.  
  24.     printf("回数は%d\n", c);
  25.  
  26.     return 0;
  27. }
  28.  
  29.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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数列a5の値は46
回数は9
https://ideone.com/q1Jg1P
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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