The first (and the only) input line contains integer number w (1 ≤ w ≤ 100)....
I just don't know how to say w=(1 ≤ w ≤ 100) in C++ language.
int w=(1 <= w <= 100); ?
That is telling you what the input will contain, not that you are supposed to check that is the case.
Exactly, it is just saying the input will consist of a number, and that it will lie within the range 1 to 100 inclusive. It's a description.
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