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Эта замечательная задача давно стала классикой — выдал ее на занятии на этой неделе. Весной этой задаче исполнится 30 лет.

Ее автор Сергей Маркелов, замечательный человек, которого сегодня увы не стало.



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Эта замечательная задача давно стала классикой — выдал ее на занятии на этой неделе. Весной этой задаче исполнится 30 лет.

Ее автор Сергей Маркелов, замечательный человек, которого сегодня увы не стало.

BY Олимпиадная геометрия




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Telegram | DID YOU KNOW?

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On February 27th, Durov posted that Channels were becoming a source of unverified information and that the company lacks the ability to check on their veracity. He urged users to be mistrustful of the things shared on Channels, and initially threatened to block the feature in the countries involved for the length of the war, saying that he didn’t want Telegram to be used to aggravate conflict or incite ethnic hatred. He did, however, walk back this plan when it became clear that they had also become a vital communications tool for Ukrainian officials and citizens to help coordinate their resistance and evacuations. Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp. Telegram does offer end-to-end encrypted communications through Secret Chats, but this is not the default setting. Standard conversations use the MTProto method, enabling server-client encryption but with them stored on the server for ease-of-access. This makes using Telegram across multiple devices simple, but also means that the regular Telegram chats you’re having with folks are not as secure as you may believe. Some privacy experts say Telegram is not secure enough Groups are also not fully encrypted, end-to-end. This includes private groups. Private groups cannot be seen by other Telegram users, but Telegram itself can see the groups and all of the communications that you have in them. All of the same risks and warnings about channels can be applied to groups.
from hk


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