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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. long f3(int n){
  5.     if (n == 0) return 0;
  6.     else if (n == 1) return 1;
  7.     else if (n == 2) return 2;
  8.     else return f3(n-1) + f3(n-2) + f3(n-3);
  9. }       
  10.  
  11. int main(){
  12.     int n;
  13.     long result;
  14.  
  15.     scanf("%d",&n); // nの入力
  16.     result = f3(n); // f3の計算
  17.     printf("f3(%d) = %ld\n", n, result); // 結果の出力
  18.  
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0.11s 5308KB
comments (?)
stdin
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30
stdout
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f3(30) = 45152016
https://ideone.com/eRkzgq
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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