## Question 1
What should be the output if the following tree is given as input?

tree = [25, 14, 35, -1, 15, null, 200, null, 10, null, null, 90, 350]
```text
          __ 25 _ 
         |       |
      __ 14 _    35 _ 
     |       |       |
     -1 _    15   __ 200 _ 
         |       |        |
         10      90       350 
### Options

1. [[25], [14, 35], [-1, 15, 200], [10, 90, 350]]
Incorrect

----------------------------

2. [[-1], [14, 10], [25, 15], [35, 90], [200], [350]]
Correct
Moving from left to right, this is the correct column by column order of the node values.
----------------------------

3. [[-1], [14], [10], [25], [15], [35],  [90], [200], [350]]
Incorrect

----------------------------

4. [[25, 14, -1], [10], [14, 15], [200, 90], [125, 35, 200, 350]]
Incorrect

----------------------------

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## Question 2
What should be the output if the following tree is given as input?

tree = [25, 17, 26, -1, 18, null, 28]
```text
	       __ 25 _ 
	      |       |
	   __ 17 _    26 _ 
	  |       |       |
	  -1      18      28 
### Options

1. [[25], [17, 26], [-1, 18, 28]]
Incorrect

----------------------------

2. [[25], [17], [26], [-1], [18], [28]]
Incorrect

----------------------------

3. [[-1], [17], [25, 18], [26], [28]]
Correct
Moving from left to right, this is the correct column by column order of the node values.
----------------------------

4. [[-1, 18, 28], [17, 26], [25]]
Incorrect

----------------------------

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