What is ​ BitMap?

This article is to share with you about what BitMap is. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

BitMap

BitMap uses the bit bit to mark the value corresponding to the element, and the BitMap algorithm can save a lot of storage space. This will greatly improve the efficiency in some user portrait scenarios.

Suppose we want to save numbers less than 0-7 [3, 5, 6, 6, 1, 2] to save as much space as possible. Usually we use array storage, but what if the amount of data is very large? Arrays can take up a lot of memory.

At this time, we can choose the BitMap algorithm to store, that is, using the space of 8bit to store these numbers, and each number is represented by 1 in the corresponding position.

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