Redundant parentheses

#1

import java.util.*;
public class Main {
public static boolean check(String s){
Stack st=new Stack<>();
char[] str=s.toCharArray();
for(char ch:str){
if(ch==’)’){
char top=st.peek();
st.pop();
boolean flag=true;
while(top!=’(’){

				if(top=='+' || top=='-'||top=='/'||top=='*')
				   flag=false;
				 top=st.peek();
				 st.pop();  
			}
			if(flag==true)
			return true;}
		else{
				st.push(ch);}
			
		

	}return false;	}
	public static void find(String stri){
		boolean ans=check(stri);
		if(ans==true){
		System.out.println("Yes");
	}
	else
	System.out.println("No");}

public static void main(String args[]) {
	try{
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		for(int i=0;i<t;i++){

		
		String stri=sc.nextLine();
		find(stri);
		}
	}
	catch(Exception e){System.out.println(e);}

}

}
i cannot understand what is error in this codde.

#2

there is some kind of ambiguity in the question. you are checking for parenthesis that don’t enclose any arithmetic operator.
what about the cases like eg. (a) . this will be a redundant parenthesis acc to your code, but i think it is not expected to be a redundant one. can you please check this.
thanks

#3

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