Where can I get more in depth i/o instruction?

Question

I now have about 60 different ways to code z=x+y. whoop-de-doo. 50 ways to get an x, and another 50 to get a y and an infinite ways to display/store z, and sololearn hasn't scratched the basics. Better data search, better data store and display is what is needed. Another way of turning the data inside out is not

Answer 1

hackerrank.com type of sites