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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <random>
  4.  
  5. using namespace std;
  6.  
  7. class Rand
  8. {
  9. public:
  10.     Rand(bool rand_seed = true, int value = 0)
  11.     {
  12.         if(rand_seed) u.seed(std::random_device()());
  13.         else          u.seed(value);
  14.     }
  15.     int operator()(int from, int to)
  16.     {
  17.         return d(u,std::uniform_int_distribution<>::param_type{from,to});
  18.     }
  19. private:
  20.     std::default_random_engine u;
  21.     std::uniform_int_distribution<> d;
  22. } r;
  23.  
  24. int counts()
  25. {
  26.     int s_1[2] = {2,3};
  27.     int s_2[4] = {1,3,6,4};
  28.     int s_3[4] = {1,2,6,5};
  29.     int s_4[3] = {2,6,5};
  30.     int s_5[3] = {3,6,4};
  31.  
  32.     int cnt = 0, s = 1;
  33.     for(;s != 6; ++cnt)
  34.     {
  35.         switch(s)
  36.         {
  37.         case 1: s = s_1[r(0,1)]; break;
  38.         case 2: s = s_2[r(0,3)]; break;
  39.         case 3: s = s_3[r(0,3)]; break;
  40.         case 4: s = s_4[r(0,2)]; break;
  41.         case 5: s = s_5[r(0,2)]; break;
  42.         }
  43.     }
  44.     return cnt;
  45. }
  46.  
  47. int main()
  48. {
  49.     int tot = 0, ok = 0;
  50.     for(; tot < 10000000;)
  51.     {
  52.         ++tot;
  53.         ok += counts();
  54.     }
  55.     cout << double(ok)/tot << "\n";
  56. }
  57.  
Success #stdin #stdout 1.94s 4888KB
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https://ideone.com/KZ2KAG
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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