Tag：Shift left
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Time：2021-10-25
Title: Implement lrucache class: Lrucache (int capacity) initializes the LRU cache with a positive integer as capacity Int get (int key) if the keyword key exists in the cache, the value of the keyword is returned; otherwise, – 1 is returned. Void put (int key, int value) if the keyword already exists, change its data […]
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Time：2021-8-5
For more compact data, C programs can store information with independent bits or multiple bits combined together. File access permission is a common application case. The bit operator allows processing of independent bits in a byte or larger data unit: any bit or multiple bits can be cleared, set, or inverted. You can also move […]
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Time：2020-12-4
Twitter’s snowflake is widely used in distributed generation of unique UUID, and there are also many variants of the algorithm based on snowflake on the Internet. Many of the UUIDs generated by using snowflake are used in distributed scenarios. I have seen several articles on the Internet that are implemented in PHP without considering thread […]
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Time：2020-11-27
preface At the beginning of July, we challenged leetcode‘s question 29 (medium difficulty, which seems nothing to boast about). The problem requires that the function of integer division be realized without division, multiplication and modular operation. Since the divisor and divisor are integers, subtraction can be used to achieve division (what a naive idea). A […]
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Time：2020-10-7
0. Summary In the first two articles, we have learned the basic principle of binary (talk about binary (1)) and the four binary operations (talk about binary (2)). In this article, we will take a look at binary bit operation. Let’s first look at the bit operations: The table above lists all the bit operators […]
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Time：2020-9-13
Twitter’s snowflake is widely used in distributed generation of unique UUID, and there are also many variants of the algorithm based on snowflake on the Internet. Many of the UUIDs generated by using snowflake are used in distributed scenarios. I have seen several articles on the Internet that are implemented in PHP without considering thread […]
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Time：2020-9-3
Operator is the operation characteristic of database. It can simplify SQL code and save development time and improve development efficiency for text characters and some label characters. Comparison operator In PostgreSQL, the comparison operator can be used for all data types, and the operation result of the comparison operator returns a Boolean value. That is, […]
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Time：2020-6-28
Original code, inverse code, complement code Signed displacement operation (< and > >Signed displacement operations are divided into < (shift left) and > > (shift right). These two kinds of displacements are for complement operation. Symbol bits are involved in displacement operation. Except for the negative number to fill 1 in the high position, the […]
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Time：2020-5-26
Operators are the operational characteristics of database. For the processing of text characters and some label characters, using operators can simplify SQL code, save development time and improve development efficiency. Comparison operator In PostgreSQL, all data types can use the comparison operator, and the comparison operator returns a Boolean value. True or false. The comparison […]
