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# Connected Components

Problem Description

Given a graph with A nodes.
The edges in graph are given in a 2D array B.
There is an undirected edge between B[i][0] and B[i][1].
Find the number of connected components in the given graph.

Problem Constraints
1 <= A <= 105
1 <= |B| <= 105
1 <= B[i][0], B[i][1] <= A

Input Format
First argument is an integer A.
Second argument is a 2D integer array B.

Output Format
Return an integer.

Example Input
Input 1:
```A = 4
B = [[1, 2],
[2, 3]]
```

Input 2:

```A = 3
B = [1, 2]
[2, 1]
```

Example Output
Output 1:
`2`

Output 2:

`2`

Example Explanation
Explanation 1:
``` The two connected components are [1, 2, 3] and [4].
```

Explanation 2:

```The two connected components are [1, 2] and [3].
```

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.
Hints
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## Discussion

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