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- public static boolean checkParentesis(String st){
- Stack<Character> expr=new Stack<Character>();
- char[] str=st.toCharArray();
- for(char ch:str){
- switch (ch) {
- case '(':
- expr.push('(');
- break;
- case '<':
- expr.push('<');
- break;
- case '[':
- expr.push('[');
- break;
- case ')':
- if(!expr.isEmpty()&&expr.peek()=='(')
- expr.pop();
- else
- return false;
- break;
- case ']':
- if(!expr.isEmpty()&&expr.peek()=='[')
- expr.pop();
- else
- return false;
- break;
- case '>':
- if(!expr.isEmpty()&&expr.peek()=='<')
- expr.pop();
- else
- return false;
- break;
- default:
- break;
- }
- }
- if(expr.isEmpty())
- return true;
- return false;
- }
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