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  1. #include <iostream>
  2. #include <fstream>
  3. #include <strstream>
  4. #include <cctype>
  5. #include <string>
  6.  
  7.  
  8. //кол-во слов в строке
  9. int count_words(const char* s){
  10. 	int n = 0;
  11. 	while(*s){
  12. 		while(*s && ! isalnum(*s))
  13. 			++s;
  14. 		if(isalnum(*s)){
  15. 			++n;
  16. 			while(isalnum(*s))
  17. 				++s;
  18. 		}
  19. 	}
  20. 	return n;
  21. }
  22.  
  23. //удаление слова
  24. void remove_avg(std::string& s){
  25. 	int inx;
  26. 	int cnt = count_words(s.c_str());
  27. 	if(cnt <= 2)
  28. 		return;
  29.  
  30. 	cnt = (cnt + 2) / 3;
  31. 	inx = 0;
  32.  
  33. 	const char* i, *p = s.c_str();
  34. 	while(*p){
  35. 		while(*p && ! isalnum(*p))
  36. 			++p;
  37.  
  38. 		if(isalnum(*p)){
  39. 			i = p + 1;
  40. 			while(isalnum(*i))
  41. 				++i;
  42.  
  43. 			if(inx++ >= cnt){
  44. 				s.erase((p - s.c_str()), i - p);
  45. 				break;
  46. 			}
  47. 			p = i;
  48. 		}
  49. 	}
  50. }
  51.  
  52.  
  53. //удаление среднего слова
  54. void output_rem(std::ostream& _o, std::istream& _i){
  55. 	std::string l;
  56. 	while((! _i.eof()) && (! _i.fail())){
  57. 		std::getline(_i, l);
  58. 		if(l.length() > 0){
  59. 			remove_avg(l);
  60. 			_o << l << std::endl;
  61. 		} else
  62. 			_o << std::endl;
  63. 	}
  64. 	_o.flush();
  65. }
  66.  
  67.  
  68.  
  69. int main(void){
  70. 	char s[] = "fox dog bat cat wolf bea cow\r\n"\
  71. 	           "AA BB CC DD EE FF\r\n"\
  72. 	           "A1 B2 C3 D4 C5";
  73. 	std::istrstream ist(s);
  74. 	output_rem(std::cout, ist);
  75.  
  76. /*  вот работать с файлом
  77. 	std::ifstream fin("input.txt");
  78. 	std::ofstream fout("output.txt");
  79. 	output_rem(fout, fin);
  80. 	fin.close();
  81. 	fout.close();
  82. */
  83. 	return 0;
  84. }
  85.  
Success #stdin #stdout 0s 3276KB
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stdin
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Standard input is empty
stdout
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fox dog bat  wolf bea cow
AA BB  DD EE FF
A1 B2  D4 C5
https://ideone.com/TWU1xe
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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