ToruNiina 8208bbf236 fix: check and convert value manually ...

I totally have no idea when std::count returns a negative value, but the
result type of `std::count` is a differnce_type. So when it is added
with size_t value, implicit sign conversion happens. This changes check
this kind of (almost trivial but required) checking.

2019-06-20 22:27:16 +09:00

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