Find the total number of regions in a two dimensional array.
0 represents water and hence its not considered as region and any other decimal number 1 to n represents a region. Up, down, left, right neighbors cordinates are considered for calculating regions.
Ex:
[ [2, 0],
[2, 2] ]
There is only one region formed by 2s

Example 2:
[[3, 1, 0],
[2, 3, 0],
[2, 2, 0]]
Here there are 4 regions formed by 1s, 2s, region formed by 3s considered as two different regions as they are diagnol to each other

Example 3:
[[1, 1, 0, 0,3],
[1, 0, 2, 0,0],
[2, 2, 2, 0,0],
[5, 5, 2, 0,4],
[0, 0, 3, 3, 0]]
Six regions formed by 1s, 2s, 3s (twice), 4s and 5s