getchar_unlocked( ) VS scanf() VS cin

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Two points to consider.

  1. getchar_unlocked is deprecated in Windows because it is thread unsafe version of getchar().

  2. Unless speed factor is too much necessary, try to avoid getchar_unlocked.

Now, as far as speed is concerned.

    getchar_unlocked > getchar

because there is no input stream lock check in getchar_unlocked which makes it unsafe.

    getchar > scanf

because getchar reads a single character of input which is char type whereas scanf can read most of the primitive types available in c.

    scanf > cin (>> operator)

because check this link

So, finally

getchar_unlocked > getchar > scanf > cin

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