Why only streamlined input?

Question

Why does the code playground only have the ability to prompt for streamlined input, and not for live console input?

Answer 1

online compilers run whole bunch of code at once, making "live input" will require sending data to and from client with every Console.ReadLine();
which would slow down all process (execution of program). especially if ≈10000 codes run simultaneously

Answer 2

It's most likely not an issue of resources (taking input and prompting for it is not resource-intensive), it's just difficult to detect that the program is waiting for input. You'll find that any online compiler that allows for user input does the same thing-- You provide all input before running the program.

As far as I can tell, SoloLearn looks for code that appears to be reading input, even if you don't use it. For example,

if(false) std::cin << x;

will show the input prompt, even though it's never called.