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  1. #include <iostream>
  2. #include <string>
  3. #include <utility>
  4.  
  5. std::string spinWords( const std::string &s, std::string::size_type length = 5 )
  6. {
  7. 	std::string t( s );
  8. 	const char *delim = " \t";
  9.  
  10. 	for ( std::string::size_type i = 0; i != t.size();  )
  11. 	{
  12. 		auto pos = t.find_first_not_of( delim, i );
  13.  
  14. 		if ( pos != std::string::npos )
  15. 		{
  16. 			i = t.find_first_of( delim, pos );
  17.  
  18. 			if ( i == std::string::npos ) i = t.size();
  19.  
  20. 			if ( length < i - pos )
  21. 			{
  22. 				auto n = i - pos;
  23.  
  24. 				for ( std::string::size_type j = 0; j < n / 2; j++ )
  25. 				{
  26. 					std::swap( t[pos + j], t[i - j - 1] );
  27. 				}
  28. 			}
  29. 		}
  30. 		else
  31. 		{
  32. 			i = t.size();
  33. 		}
  34. 	}
  35.  
  36. 	return t;
  37. }
  38.  
  39. int main() 
  40. {
  41.  
  42. 	std::string s( "1 12 123 1234 12345 123456 1234567 123456789 1234567890" );
  43.  
  44. 	std::cout << s << '\n';
  45. 	std::cout << spinWords( s ) << '\n';
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 4524KB
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stdin
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Standard input is empty
stdout
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1 12 123 1234 12345 123456 1234567 123456789 1234567890
1 12 123 1234 12345 654321 7654321 987654321 0987654321
https://ideone.com/u8kwYr
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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