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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. long f3(int n){
  5.     if (n >= 3){
  6.         return f3(n-1) + f3(n-2) + f3(n-3);
  7.     }           
  8.     else if (n == 0){
  9.         return 0;
  10.     }
  11.     else if (n == 1){
  12.         return 1;
  13.     }
  14.     else if (n == 2){
  15.         return 2;
  16.     }
  17. }       
  18.  
  19. int main(){
  20.     int n;
  21.    long r;
  22.  
  23.     scanf("%d",&n); // nの入力
  24.     r= f3(n); // f3の計算
  25.     printf("f3(%d) = %ld\n", n, r); // 結果の出力
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0.16s 5280KB
comments (?)
stdin
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30
stdout
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f3(30) = 45152016
https://ideone.com/iRkJUU
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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