Java Solution only 0ms


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      public static boolean isSameTree(TreeNode p, TreeNode q) {
        		if(p == null && q == null)
        			return true;
        		else if((p != null && q == null) || (p == null && q != null))
        			return false;
        		else if(p.val != q.val)
        			return false;
        		else 
        			return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
       }

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