10918 - Tri Tiling/10918.cpp

   1 /*
   2   Wrong Answer.
   3  */
   4 #include <iostream>
   5
   6 using namespace std;
   7
   8
   9 unsigned long long x[31], y[31], z[31];
  10
  11 int main(){
  12   x[0] = 1; y[0] = 0; z[0] = 2;
  13   x[1] = 0; y[1] = 2; z[1] = 0;
  14   for (int i=2; i<=30; ++i){
  15     x[i] = x[i-2] + y[i-1];
  16     y[i] = z[i-1];
  17     z[i] = 2*x[i-1] + y[i-1];
  18   }
  19   int n;
  20   while (cin >> n && n != -1){
  21     cout << x[n] << endl;
  22   }
  23   return 0;
  24 }