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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int c;
  4. int rec(int n){
  5.   if(n==1){
  6.     c++;
  7. 	return 1;
  8.   }
  9.   else if(n==2){
  10.     c++;
  11. 	return 2;
  12.   }
  13.   else{
  14.     c++;
  15. 	return -6*rec(n-1)-9*rec(n-2);
  16.   }
  17.  
  18.  
  19. }
  20.  
  21. int main(void) {
  22.     int n = 5;
  23.     printf("数列a%dの値は%d\n", n, rec(n));
  24.     printf("このときrecの呼び出し回数は%d",c);
  25. 	return 0;
  26. }
  27.  
  28.  
Success #stdin #stdout 0s 5288KB
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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/E3tti1
language:
C (gcc 8.3)
created:
72 days ago
visibility:
public

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