Given a unsigned char bitmapRep[8192], how to efficiently find out all "开发者_运维百科1" bits' positions? Thanks.
What do you mean by "find"?
This may seem like a smart-ass answer, but I'm perfectly serious: you already have found them. There's a perfect map describing exactly where all the 1 bits are found, and it has a bit set in the corresponding positions.
Homework?
hint - Lookup table for each byte
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
微信重新建群怎么开发者_Go百科建？ 产品名称：苹果手机 产品型号：iPhone 11 系统版本：iOS 13
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