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Do not ask open ended questions Better to email them or post it in your activity feed https://www.sololearn.com/discuss/1316935/?ref=app
As I understand that feature is not there because it is not cost effective. It will require to maintain a constant connection between the server and the device. And a user can take a long time for providing the input, thereby effectively reducing the server capacity to serve the maximum number of connections at a time. Almost all online compilers works the same way. The only exception i know of is onlinegdb.com. There may be few more but i don't know about them.