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  1. #include <iostream>
  2. #include <stack>
  3. using namespace std;
  4. int main() {
  5. 	stack<char>s;
  6. 	char ch;
  7. 	while (1) {
  8. 		int check = 1, start = 1;
  9. 		for (int i = 0; i < s.size(); i++)
  10. 			s.pop();
  11. 		while (1) {
  12. 			scanf("%c", &ch);
  13. 			if (start == 1 && ch == '.')
  14. 				start = -1;
  15. 			else if (start == 1)
  16. 				start = 0;
  17. 			else if (start == -1 && (ch == EOF || ch == '\n')) {
  18. 				start = 1;
  19. 				break;
  20. 			}
  21. 			else if (start == -1)
  22. 				start = 0;
  23. 			if (start == 0 && ch == '.') {
  24. 				scanf("%c", &ch);
  25. 				break;
  26. 			}
  27. 			if (ch == '(' || ch == '[')
  28. 				s.push(ch);
  29. 			else if (ch == ')') {
  30. 				if (s.empty()) {
  31. 					check = 0;
  32. 				}
  33. 				else if (s.top() == '(') {
  34. 					s.pop();
  35. 				}
  36. 				else if (s.top() == '[') {
  37. 					check = 0;
  38. 				}
  39. 			}
  40. 			else if (ch == ']') {
  41. 				if (s.empty()) {
  42. 					check = 0;
  43. 				}
  44. 				else if (s.top() == '[') {
  45. 					s.pop();
  46. 				}
  47. 				else if (s.top() == '(') {
  48. 					check = 0;
  49. 				}
  50. 			}
  51. 		}
  52. 		if (start == 1)
  53. 			break;
  54. 		if (check == 0 || !s.empty())
  55. 			cout << "no" << '\n';
  56. 		else
  57. 			cout << "yes" << '\n';
  58. 	}
  59. 	return 0;
  60. }
Success #stdin #stdout 0.01s 5476KB
comments (?)
stdin
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[[.
].
.
stdout
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no
yes
https://ideone.com/D7VxIr
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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