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  1. #include <cstdlib>
  2. #include <cmath>
  3. #include <cstdint>
  4. #include <iostream>
  5. #include <sstream>
  6. #include <set>
  7. #include <iterator>
  8. #include <algorithm>
  9. #include <iostream>
  10. #include <chrono>
  11.  
  12. using namespace std;
  13.  
  14. const auto n = 10000000ULL; // constexptr is tested, no effect
  15.  
  16. int main() {
  17.     {
  18.         auto t1 = std::chrono::high_resolution_clock::now();
  19.  
  20.         std::string s;
  21.  
  22.         for (auto i = 0ULL; i < n; i++)
  23.             s += "1234567890";
  24.  
  25.         auto x = s.length();
  26.  
  27.         auto t2 = std::chrono::high_resolution_clock::now();
  28.         auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(t2 - t1).count();
  29.         cout << "Result: " << x << " -- time (ms):" << t / 0.1e7 << endl;
  30.     }
  31.  
  32.     auto t1 = std::chrono::high_resolution_clock::now();
  33.  
  34.     std::ostringstream ss;
  35.  
  36.     for (auto i = 0ULL; i < n; i++)
  37.         ss << "1234567890";
  38.  
  39.     auto x = ss.str().length();
  40.  
  41.     auto t2 = std::chrono::high_resolution_clock::now();
  42.     auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(t2 - t1).count();
  43.     cout << "Result: " << x << " -- time (ms):" << t / 0.1e7 << endl;
  44. }
Success #stdin #stdout 1.46s 3472KB
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Standard input is empty
stdout
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Result: 100000000 -- time (ms):534.02
Result: 100000000 -- time (ms):927.578
https://ideone.com/4od3pE
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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