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  1. #include <string>
  2. #include <iostream>
  3. #include <iomanip>
  4. #include <chrono>
  5.  
  6.  
  7. using namespace std;
  8.  
  9.  
  10. int main(int argc, const char * argv[])
  11. {
  12.  
  13.     string s;
  14.     for(int i = 0; i < 100000; ++i) s += rand()%26+'A';
  15.  
  16.     auto start = chrono::high_resolution_clock::now();
  17.     string d;
  18.     d.reserve(s.length()*3/2);
  19.     for(size_t i = 0; i < s.length(); ++i)
  20.     {
  21.         d += s[i++];
  22.         if (i < s.length())
  23.         {
  24.             d += s[i];
  25.             d += '-';
  26.         }
  27.     }
  28.     auto stop = chrono::high_resolution_clock::now();
  29.     cout << chrono::duration_cast<chrono::nanoseconds>(stop-start).count() << endl;
  30.  
  31.     start = chrono::high_resolution_clock::now();
  32.     string t;
  33.     for(size_t i = 0; i < s.length(); ++i)
  34.     {
  35.         t += s[i++];
  36.         if (i < s.length())
  37.         {
  38.             t += s[i];
  39.             t += '-';
  40.         }
  41.     }
  42.     stop = chrono::high_resolution_clock::now();
  43.     cout << chrono::duration_cast<chrono::nanoseconds>(stop-start).count() << endl;
  44.  
  45.     //cout << t << endl << endl << endl;
  46.  
  47.     start = chrono::high_resolution_clock::now();
  48.     for (size_t i(0), j(0); i < s.size(); i++, j++)
  49.     {
  50.         if (j > 1) {
  51.  
  52.             s.insert(i, "-");
  53.             j = -1;
  54.         }
  55.     }
  56.     stop = chrono::high_resolution_clock::now();
  57.     cout << chrono::duration_cast<chrono::nanoseconds>(stop-start).count() << endl;
  58.     // cout << s << endl;
  59.  
  60.  
  61. }
  62.  
Success #stdin #stdout 0.51s 3416KB
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965493
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https://ideone.com/Jmlwde
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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