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- #include <iostream>
- #include <stack>
- #include <string>
- int main(void) {
- std::stack<char> stack;
- std::string str;
- std::cin >> str;
- int len = str.length();
- for (int i = 0; i < len; ++i) {
- if (str[i] == '{' || str[i] == '(' || str[i] == '[')
- stack.push(str[i]);
- switch (str[i])
- {
- case'}':
- if (stack.top() == '{')
- stack.pop();
- else {
- std::cout << "Nein" << std::endl;
- return 0;
- }
- break;
- case']':
- if (stack.top() == '[')
- stack.pop();
- else {
- std::cout << "Nein" << std::endl;
- return 0;
- }
- break;
- case')':
- if (stack.top() == '(')
- stack.pop();
- else {
- std::cout << "Nein" << std::endl;
- return 0;
- }
- break;
- default:
- break;
- }
- }
- if (stack.size() == 0) {
- std::cout << "Ja" << std::endl;
- }
- return 0;
- }
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