Why does the iPhone need so much less RAM than Android devices?

When the user is not actively using an app, the system moves it to the background state. For many apps, the background state is just a brief stop on the way to the app being suspended. Suspending apps is a way of improving battery life it also allows

The size of a program is 164 kb. I want it to be under 100 kb. How can I do it?

Yes you can. Just try a new way of solving it with less no. of lines of code.

The size of a program is 164 kb. I want it to be under 100 kb. How can I do it?

Yes you can. Just try a new way of solving it with less no. of lines of code.