fork download
copy 
  1. #include <stdio.h>
  2.  
  3.  
  4. int c = 0;
  5.  
  6. int rec(int n){
  7.     c++; 
  8.     if(n == 1){
  9.         return 1;
  10.     }
  11.     else if(n == 2){
  12.         return 2;
  13.     }
  14.     else{
  15.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  16.     }
  17. }
  18.  
  19. int main(void) {
  20.     int n;
  21.     scanf("%d", &n);
  22.  
  23.     int result = rec(n);
  24.     printf("数列a%dの値は%d\n", n, result);
  25.     printf("recの呼び出し回数は%d回です\n", c);
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
5
stdout
copy 
数列a5の値は-459
recの呼び出し回数は9回です
https://ideone.com/Jw8Ei5
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!