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  1. #include <stdio.h>
  2. //練習問題E
  3. #include <stdio.h>
  4. //練習問題E
  5.  
  6. int tri(int n) {
  7.     if (n == 0) {
  8.         return 0;
  9.     } else if (n == 1) {
  10.         return 0;
  11.     } else if (n == 2) {
  12.         return 1;
  13.     } else {
  14.         return tri(n - 1) + tri(n - 2) + tri(n - 3);
  15.     }
  16. }
  17.  
  18. int main(void) {
  19.     int n = 7;
  20.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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数列Tnについて, n=7のときの値は13
https://ideone.com/b0p2a2
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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