std::lower_bound - cppreference.com
https://en.cppreference.com/w/cpp/algorithm/lower_bound
WEBApr 3, 2024 · Returns the first iterator iter in [first,last) where bool(*iter < value) is false, or last if no such iter exists. If the elements elem of [first,last) are not partitioned with respect to the expression bool(elem < value), the behavior is undefined. Equivalent to std::lower_bound(first, last, value, std::less{}) .
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