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Given a Matrix **mat** of **N*N** size, the task is to complete the function **constructLinkedMatrix(),** that constructs a 2D linked list representation of the given matrix.

```
Input : 2D matrix
1 2 3
4 5 6
7 8 9
Output :
1 -> 2 -> 3 -> NULL
| | |
v v v
4 -> 5 -> 6 -> NULL
| | |
v v v
7 -> 8 -> 9 -> NULL
| | |
v v v
NULL NULL NULL
```

**Input:**

The fuction takes 2 argument as input, first the 2D matrix **mat[][] **and second an integer variable **N**, denoting the size of the matrix.

There will be **T** test cases and for each test case the function will be called separately.

**Output:**

The function must return the reference pointer to the head of the linked list.

**Constraints:**

1<=T<=100

1<=N<=150

**Example:
Input:**

2

3

1 2 3 4 5 6 7 8 9

2

1 2 3 4

1 2 3 4 5 6 7 8 9

1 2 3 4

**Note:**The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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