how does this problem of concentric rectangle works , can I get some kind of explanation
Nested for loop question
I hope you are asking the question in which sir has shown the use of max function and how to print that rectangle.
It will return the max element from x+1,y+1,n-x,n-y
In python we can use max function to get the maximum value out of given some values such as for example if we have max(1,3,4,2,7,9,8,5,6) it will return value 9
So here we are focused with the max value at each step from the given inputs
so max(x+1,y+1,n-x,n-y) is there
for ex. of 3
if x = 0
and y = 0
then max(1,1,3,3) = 3
and y = 1
then max(1,2,3,2) = 3
and y = 2
then max(1,3,3,1) = 3
if x = 1
and y = 0
then max(2,1,2,3) = 3
and y = 1
then max(2,2,2,2) = 2
and y = 2
then max(2,3,2,1) = 3
if x = 2
and y = 0
then max(3,1,1,3) = 3
and y = 1
then max(3,2,1,2) = 3
and y = 2
then max(3,3,1,1) = 3
so overall it is
3 3 3
3 2 3
3 3 3
So I hope it is clear to you what is the max function.
In case you feel any doubt or confusion you are free to ask, I will surely help you out.
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Thanks 
Happy Coding !!
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yes thankyou , now I have understood