How to count a string quickly?

Question

C++ / C#

There is a long string (up to 10^7 characters). How can it be quickly read from the console?
The cin option doesn't work. Preferably scanf or gets , but I'll take note of all the options.
Thank you.

Answer 1

Why doesn't cin fit? Just do not say that slow, block reading after decoupling from C-streams is faster than scanf.
You can read about comparisons of input methods: habrahabr.ru/post/246257

Answer 2

scanf();