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  1. #include <stdio.h>
  2.  
  3. int tri(int n) {
  4.     if (n <= 1) return 0;
  5.     if (n == 2) return 1;
  6.     return tri(n - 1) + tri(n - 2) + tri(n - 3);
  7. }
  8.  
  9. int main(void) {
  10.     int n = 7;
  11.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  12.     return 0;
  13. }
Success #stdin #stdout 0.01s 5320KB
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数列Tnについて, n=7のときの値は13
https://ideone.com/PZexSr
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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