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- #include <iostream>
- #include <stack>
- int main()
- {
- std::stack<char> brackets;
- std::string input;
- std::getline(std::cin, input);
- bool isValid = true;
- for (char i : input)
- {
- switch (i)
- {
- case '(':
- brackets.push(')');
- break;
- case '{':
- brackets.push('}');
- break;
- case '[':
- brackets.push(']');
- break;
- case ')':
- case '}':
- case ']':
- if (brackets.empty() || brackets.top() != i)
- {
- isValid = false;
- }
- else
- {
- brackets.pop();
- }
- break;
- default:
- break;
- }
- if (!isValid)
- {
- break;
- }
- }
- if (isValid && brackets.empty())
- {
- std::cout << "Valid" << std::endl;
- }
- else
- {
- std::cout << "Invalid" << std::endl;
- }
- return 0;
- }
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