Hey,

I've used stacks to solve this. Although I'm getting correct results for all the test cases I could think of, I'm still getting a WA on submission. Please Help!

import java.util.*;
import java.lang.*;
import java.io.*;
 
 
class Codechef
{ 
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		Stack<Integer> stack = new Stack<Integer>();
		int pos1=0;
		int pos2=0;
		int length=0;
		int lengthmax=0;
		int depth=0;
		int depthmax=0;