Getting wrong output for one string in custom input

#1

https://ide.codingblocks.com/s/163179 this is my code

#2

i got this from the solution segment
pls see the comment of the code, definition of redundant parenthesis is given

char[] str = s.toCharArray();
for (char ch : str) {
// if current character is close parenthesis ‘)’
if (ch == ‘)’) {
// pop character from the stack
char top = Stack.peek();
Stack.pop();

            // stores the number of characters between a  
            // closing and opening parenthesis  
            // if this count is less than or equal to 1  
            // then the brackets are redundant else not  
            int elementsInside = 0; 
            while (top != '(') { 
                elementsInside++; 
                top = Stack.peek(); 
                Stack.pop(); 
            } 
            if (elementsInside < 1) { 
                return true; 
            } 
        } // push open parenthesis '(', operators and  
        // operands to stack  
        else { 
            Stack.push(ch); 
        } 
    }
#3

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