Alternative solution for Q15

[cck181851]

I think learning pad function may be helpful and it is more dynamic A=numpy.zeros([4,4]) print(numpy.pad(A,(1,1),"constant",constant_values=1))

[cck181851]

I just realized that Q16 is very similar and uses pad.But anyway,I think using pad is more dynamic

[rougier]

Thanks. Can you make a PR and add your solution alognside the old one (like alternative way: ...) ? Make sure to modify the ktx files that are used to generate others.