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Invert the Binary Tree

Problem Description

Given a binary tree A, invert the binary tree and return it.

Inverting refers to making left child as the right child and vice versa.

Problem Constraints

1 <= size of tree <= 100000

Input Format

First and only argument is the head of the tree A.

Output Format

Return the head of the inverted tree.

Example Input

Input 1:

```
1
/   \
2     3
```

Input 2:

```
1
/   \
2     3
/ \   / \
4   5 6   7
```

Example Output

Output 1:

```
1
/   \
3     2
```

Output 2:

```
1
/   \
3     2
/ \   / \
7   6 5   4
```

Example Explanation

Explanation 1:

```Tree has been inverted.
```

Explanation 2:

```Tree has been inverted.
```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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