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  1. #include <stdio.h>
  2.  
  3. int tri(int n){
  4.     if(n == 0) 
  5.     return 0;
  6.     else if(n == 1) 
  7.     return 0;
  8.     else if(n == 2) 
  9.     return 1;
  10.     else return tri(n-1) + tri(n-2) + tri(n-3);
  11. }
  12.  
  13. int main(void) {
  14. 	int n = 7;
  15.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  16. 	return 0;
  17. }
  18.  
Success #stdin #stdout 0s 5316KB
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Standard input is empty
stdout
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数列Tnについて, n=7のときの値は13
https://ideone.com/rxdNyj
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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