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Problem of the day

You are given a 2D matrix ‘MATRIX’ of ‘N’*’M’ dimension. You have to return the spiral traversal of the matrix.

Example:

```
Input:
MATRIX = [ [1, 3, 5, 7], [10, 11, 16, 20], [23, 30, 34, 60] ]
Output:
1 3 5 7 20 60 34 30 23 10 11 16
Explanation: Starting from the element in the first row and the first column, traverse from left to right (1 3 5 7), then top to bottom (20 60), then right to left (34 30 23), then bottom to up (10) and then left to right (11 16).
```

Detailed explanation

```
1 <= N, M <= 10^5
1 <= MATRIX [ i ] [ j ] <= 10^9
The sum of N*M over all test cases is less than 2*10^5.
Time Limit: 1 sec
```

```
3 3
1 3 7
10 12 15
19 20 21
```

```
1 3 7 15 21 20 19 10 12
```

```
Input:
MATRIX = [ [1, 3, 7], [10, 12, 15], [19, 20, 21] ],
Output:
1 3 7 15 21 20 19 10 12
Explanation: Starting from the element in the first row and the first column, traverse from left to right (1 3 7), then top to bottom (15 21), then right to the left (20 19), then bottom to up (10) and then left to right (12).
```

```
4 4
1 5 9 13
14 15 16 17
19 20 21 50
59 60 71 80
```

```
1 5 9 13 17 50 80 71 60 59 19 14 15 16 21 20
```