@bootcoder-himanshu

Sorry for tge audio guys ,i will take care of it from Tommorow

@bootcoder-himanshu

class FindElements {
        HashSet<Integer> hs;
      public void Recover(TreeNode root,int val){
        hs.add(val);
      if(root==null) return ;
      if(root.left!=null){ 
       Recover(root.left,val*2+1);}
        if(root.right!=null){ 
       Recover(root.right,val*2+2);
       }

   }
    public FindElements(TreeNode root) {
          hs=new HashSet<>();

          Recover(root,0);

     }
    
    public boolean find(int target) {
        if(hs.contains(target)) return true;
        return false;
    }
}