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  1. #include <iostream>
  2. #include <chrono>
  3.  
  4. using namespace std;
  5.  
  6. inline unsigned GenUnsigned()
  7. {
  8.     static constexpr unsigned im = 139968, ia = 3877, ic = 29573;
  9.     static unsigned last = 42;
  10.     return (last = (last * ia + ic) % im);
  11. }
  12.  
  13. inline int GenSigned()
  14. {
  15.     static constexpr int im = 139968, ia = 3877, ic = 29573;
  16.     static int last = 42;
  17.     return (last = (last * ia + ic) % im);
  18. }
  19.  
  20.  
  21. int main()
  22. {
  23.     using timer = std::chrono::high_resolution_clock;
  24.     using to_ms = std::chrono::duration<double, std::milli>;
  25.  
  26.     auto time_start = timer::now();
  27.     unsigned long long u_result = 0;
  28.     for(unsigned i = 0; i < 200000000u; ++i)
  29.         u_result += GenUnsigned();
  30.     auto time_end = timer::now();
  31.  
  32.     std::cout << "uint time: " << to_ms(time_end - time_start).count() << " result:" << u_result << std::endl;
  33.  
  34.     time_start = timer::now();
  35.     long long i_result = 0;
  36.     for(int i = 0; i < 200000000; ++i)
  37.         i_result += GenSigned();
  38.     time_end = timer::now();
  39.  
  40.     std::cout << " int time: " << to_ms(time_end - time_start).count() << " result:" << i_result << std::endl;
  41.  
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 1.6s 4512KB
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stdin
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Standard input is empty
stdout
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uint time: 770.316 result:13996696082304
 int time: 823.6 result:13996696082304
https://ideone.com/QfmPCL
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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