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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. 	{
  17.     	auto start = chrono::high_resolution_clock::now();
  18.     	string d;
  19.     	d.reserve(s.length()*3/2);
  20.     	for(size_t i = 0; i < s.length(); ++i)
  21.     	{
  22.         	d += s[i++];
  23.         	if (i < s.length())
  24.         	{
  25.             	d += s[i];
  26.             	d += '-';
  27.         	}
  28.     	}
  29.     	auto stop = chrono::high_resolution_clock::now();
  30.     	cout << chrono::duration_cast<chrono::nanoseconds>(stop-start).count() << endl;
  31. 	}
  32.  
  33. 	{
  34.     	auto start = chrono::high_resolution_clock::now();
  35.  
  36.    	    string str;
  37.     	str.resize(s.length() * 3/2);
  38.     	size_t size = 0;
  39.  
  40.     	for (size_t i = 0; i < s.length(); ++i) {
  41.         	str[size++] = s[i++];
  42.         	if (i < s.length()) {
  43. 	            str[size++] = s[i];
  44.             	if (i != s.length() - 1)
  45.                 	str[size++] = '-';
  46.         	}
  47.     	}
  48.     	// ;-)
  49.     	str.resize(size);
  50.  
  51.     	auto stop = chrono::high_resolution_clock::now();
  52.     	cout << chrono::duration_cast<chrono::nanoseconds>(stop-start).count() << endl;
  53. 	}
  54.  
  55.  
  56. }
  57.  
Success #stdin #stdout 0s 3416KB
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https://ideone.com/VbE5RW
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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