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  1. #include <stdio.h>
  2.  
  3. #define MaxN 100
  4.  
  5. int m[3][MaxN];
  6.  
  7. int f(int n)
  8. {
  9.     int i;
  10.  
  11.     m[0][1] = m[1][1] = m[2][1] = 1;
  12.  
  13.     for (i = 2; i <= n; i++)
  14.     {
  15.         m[0][i] = m[0][i-1] + m[1][i-1] + m[2][i-1];
  16.         m[1][i] = m[0][i-1] + m[2][i-1];
  17.         m[2][i] = m[0][i-1] + m[1][i-1];
  18.     }
  19.  
  20.     return m[0][n] + m[1][n] + m[2][n];
  21. }
  22.  
  23. int main()
  24. {
  25.     int i;
  26.  
  27.     for (; scanf("%d\n", &i) > 0 && i < MaxN; printf("f(%d) = %d\n", i, f(i)));
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0s 1836KB
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stdin
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10 20 101
stdout
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f(10) = 8119
f(20) = 54608393
https://ideone.com/RllXdk
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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