Алгоритм upper_bound
Он возвращает итератор, указывающий на первый элемент в диапазоне [first, last), который больше значения, или last, если такой элемент не найден.
Элементы в диапазоне должны быть уже отсортированы или, по крайней мере, разделены по значению val.
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BY C++ geek
Telegram has made it easier for its users to communicate, as it has introduced a feature that allows more than 200,000 users in a group chat. However, if the users in a group chat move past 200,000, it changes into "Broadcast Group", but the feature comes with a restriction. Groups with close to 200k members can be converted to a Broadcast Group that allows unlimited members. Only admins can post in Broadcast Groups, but everyone can read along and participate in group Voice Chats," Telegram added.
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