Consider a Array of N x N
For example take 3 X 3
Since the array is sorted by row and column , sort all the array
elements by reading it in zig-zag order.

for example
5    8    9
6   10  13
11  15  17


can be read as

5  6  8  9  10  11  13  15  17

by chechking whether the row or column entry contains smaller number
when reading in zig zag order.

After the two given N x N array are sorted , merge the two using sorted
outputs

Take the first N of final merged sorted array and arrange it in zig azg
order
It contains the least N^2 elements from the two given array

and the median is the centre element ie.,(N/2,N.2) of the array


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