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  1. #include <vector>
  2. #include <string>
  3. #include <iostream>
  4. #include <iomanip>
  5. #include <chrono>
  6. #include <random>
  7.  
  8. using namespace std;
  9.  
  10. class muTimer
  11. {
  12.     using Clock = std::chrono::high_resolution_clock;
  13.     bool active = false;
  14.     Clock::duration   duration_;
  15.     Clock::time_point start_ = Clock::now(), stop_ = Clock::now();
  16.  
  17.     muTimer(const muTimer&)             = delete;
  18.     muTimer& operator=(const muTimer&)  = delete;
  19. public:
  20.     using ns       = std::chrono::nanoseconds;
  21.     using mks      = std::chrono::microseconds;
  22.     using ms       = std::chrono::milliseconds;
  23.     muTimer() { reset(); start(); }
  24.     ~muTimer() = default;
  25.     muTimer& reset()
  26.     {
  27.         duration_ = std::chrono::nanoseconds(0);
  28.         active    = false;
  29.         return *this;
  30.     }
  31.     muTimer& start()
  32.     {
  33.         if (!active)
  34.         {
  35.             start_ = Clock::now();
  36.             active = true;
  37.         }
  38.         return *this;
  39.     }
  40.     muTimer& stop()
  41.     {
  42.         if (active)
  43.         {
  44.             stop_      = Clock::now();
  45.             duration_ += stop_ - start_;
  46.             active     = false;
  47.         }
  48.         return *this;
  49.     }
  50.     template<typename T = mks>
  51.         unsigned long long duration()
  52.     {
  53.         return static_cast<unsigned long long>
  54.             (std::chrono::duration_cast<T>(stop_-start_).count());
  55.     }
  56. };
  57.  
  58.  
  59. int day(const char * nm)
  60. {
  61.     long long x = nm[0]+nm[1]+nm[2]-300;
  62.     return (((((101047ll*x+694384ll)*x-19207693ll)*x-61935874ll)*x
  63.              +1060034136ll)*x-1218412800)*(2+x)/2058376320+1;
  64. }
  65.  
  66. int DAY(const char * str)
  67. {
  68.     if((str[0] =='M') && (str[1] == 'o') && (str[2] == 'n')) return 1;
  69.     if((str[0] =='T') && (str[1] == 'u') && (str[2] == 'e')) return 2;
  70.     if((str[0] =='W') && (str[1] == 'e') && (str[2] == 'd')) return 3;
  71.     if((str[0] =='T') && (str[1] == 'h') && (str[2] == 'u')) return 4;
  72.     if((str[0] =='F') && (str[1] == 'r') && (str[2] == 'i')) return 5;
  73.     if((str[0] =='S') && (str[1] == 'a') && (str[2] == 't')) return 6;
  74.     if((str[0] =='S') && (str[1] == 'u') && (str[2] == 'n')) return 7;
  75.     return 0;
  76. }
  77.  
  78.  
  79. int main()
  80. {
  81.  
  82.     char M[7][4] = { "Mon","Tue","Wed","Thu","Fri","Sat","Sun" };
  83.  
  84.     {
  85.         mt19937 gen(0);
  86.         uniform_int_distribution<> distrib(0,6);
  87.         int sum = 0;
  88.         muTimer mt;
  89.         for(int i = 0; i < 20000000; ++i)
  90.         {
  91.             sum += day(M[distrib(gen)]);
  92.         }
  93.         mt.stop();
  94.         cout << sum << " for " << mt.duration<>() << " mks\n";
  95.     }
  96.     {
  97.         mt19937 gen(0);
  98.         uniform_int_distribution<> distrib(0,6);
  99.         int sum = 0;
  100.         muTimer mt;
  101.         for(int i = 0; i < 20000000; ++i)
  102.         {
  103.             sum += DAY(M[distrib(gen)]);
  104.         }
  105.         mt.stop();
  106.         cout << sum << " for " << mt.duration<>() << " mks\n";
  107.     }
  108.  
  109. }
  110.  
Success #stdin #stdout 1.34s 4504KB
comments (?)
stdin
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Standard input is empty
stdout
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80000618 for 587948 mks
80000618 for 747356 mks
https://ideone.com/NXnXzU
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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