It is showing tle, what am i doing wrong?

#1

import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc=new Scanner(System.in);

	String str=sc.nextLine();
	int a=1;
	int low=0;
	int high=str.length()-1;
	if(str.length()==0 || str.length()==1){
		System.out.println("true");
	}
	else{
		while(low<high){
			if(str.charAt(low)==str.charAt(high)){
				low++;
				high--;
			}
			else{
				a=0;
			}
		}
		if(a==0){
			System.out.println("false");
		}
		else{
			System.out.println("true");
		}
	}
}

}

#2

@laibaahsan27_1dfa992390072fd9 You should break the loop when str.charAt(low)==str.charAt(high) comes out to be false because your else condition makes a = 0; but since it is not updating low and high so the loop will continue for infinite times. so just add a break statement after you make a = 0; like this :

if(str.charAt(low)==str.charAt(high)){
				low++;
				high--;
			}
			else{
				a=0;
				//added break statement here
				break;
			}
#3

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