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  1. #include <iostream>
  2. #include <sstream>
  3. #include <fstream>
  4. #include <stack>
  5.  
  6. void test_branch(std::ostream& _out, std::istream& _in){
  7. 	std::stack<char> st;
  8. 	char c;
  9. 	int  r = 1;
  10.  
  11. 	while(_in.get(c) && !_in.fail()){
  12. 		if(c == '\n' || c == '\r')
  13. 			break;
  14. 		else if(c == '[' || c == '(' || c == '{')
  15. 			st.push(c);
  16. 		else if(c == ']' || c == ')' || c == '}'){
  17. 			if(st.empty()){
  18. 				r = 0;
  19. 				break;
  20. 			}
  21. 			if(st.top() == '(' && c == ')' || 
  22. 			   st.top() == '[' && c == ']' ||	
  23. 			   st.top() == '{' && c == '}')
  24. 				st.pop();
  25. 			else {
  26. 				r = 0;
  27. 				break;
  28. 			}
  29. 		}
  30. 	}
  31.  
  32. 	if(! st.empty())
  33. 		r = 0;
  34. 	_out << ((r) ? "ПРАВИЛЬНО." : "НЕПРАВИЛЬНО.") << std::endl;
  35. }
  36.  
  37. int main(void) {
  38. 	//с консоли
  39. 	test_branch(std::cout, std::cin);
  40. /*  со строкового-потока
  41. 	char s[] = "Лвыо(лдв)дло((влдо)лоады)щ{{df}]";
  42. 	std::istringstream sp(s);
  43. 	test_branch(std::cout, sp);
  44. */
  45.  
  46. /*  из файла
  47. 	std::ifstream fin("intput.txt");
  48. 	std::ofstream fout("output.txt");
  49. 	test_branch(fout, fin);
  50. 	fin.close();
  51. 	fout.close();
  52. */
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
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Лвыо(лдв)дло((влдо)лоады)щ{{df}]
stdout
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НЕПРАВИЛЬНО.
https://ideone.com/17EI2D
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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