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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n;
  5.     scanf("%d", &n);
  6.  
  7.     long long dp0 = 1, dp1 = 1, dp2 = 0;
  8.  
  9.     for (int i = 2; i <= n; i++) {
  10.         long long new_dp0 = dp0 + dp1 + dp2;
  11.         long long new_dp1 = dp0;
  12.         long long new_dp2 = dp1;
  13.  
  14.         dp0 = new_dp0;
  15.         dp1 = new_dp1;
  16.         dp2 = new_dp2;
  17.     }
  18.  
  19.     printf("%lld\n", dp0 + dp1 + dp2);
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/MSw65W
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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