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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 = 0;
  4. int rec(int n){
  5. 	c++;
  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; 
  19.     scanf("%d", &n);
  20.     int value = rec(n);
  21.     printf("数列a%dの値は%d\n", n, value);
  22.     printf("このときrecの呼び出し回数は%d\n", c);
  23. 	return 0;
  24. }
  25.  
  26.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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5
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/PrU1MM
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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