Programmer Think

1. Prepare a data sheet called fruits MariaDB [vincen]> CREATE TABLE fruits #Create a data table -> ( -> f_id char(10) NOT NULL, -> s_id INT NOT NULL, -> f_name char(255) NOT NULL, -> f_price decimal(8,2) NOT NULL, -> PRIMARY KEY(f_id) -> ); Query OK, 0 ...

The structure of snowflake is as follows (each part is separated with -): 0 - 0000000000 0000000000 0000000000 0000000000 0 - 00000 - 00000 - 000000000000 The first bit is unused, the next 41 bits are millisecond time (the length of 41 bits can be used for 69 years), then 5-bit datacenterId and 5-bit workerid (the length of 10 bits can suppor ...

Demand analysis: 1. Independent function, that is, a page can have multiple input boxes with the same function 2. There are various functional requirements, and there are differences in the maximum number and data form 3. After completion of input, data interaction with the background (pass id) 4. Click delete or delete to ...

Effect: Train of thought: 1, Use relative positioning and absolute positioning, place the list on the upper layer and the delete button on the lower layer (z-index should not be negative). 2, There are three touch events: bindtouchstart, bindtouchmove and bindtouchend. 1. bindtouchstart records the starting point of touch ...

Original address: http://poj.org/problem?id=2018 Question meaning: give you N numbers, let you find the maximum average value of a continuous number string, and the number of continuous number strings shall not be less than F. Idea: bisection average value, and then for each average value, to judge whether there is a segment o ...

Area map reference ecrats address: http://echarts.baidu.com/examples/editor.html?c=area-stack Area map github address: https://github.com/dkr380205984/myComponent/blob/master/src/page/d3/area.vue There are almost no difficulties in the implementation of area map. If you have known how to write my broken line map. Function ...

score table: CREATE TABLE `score` ( `student_id` int(10) DEFAULT NULL, `class_id` int(10) DEFAULT NULL, `score` int(5) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci Field student ID student ID, class ID: class ID, score: Score Data preparation: insert into score values(1,1,100),(2,1,93 ...

**Algorithm: parallel search set** Difficulty: (NOIP -) In fact, this problem can be directly bfs, but the search is skilled, can not be violent search! First of all, it's easy to find out that it must be the optimal solution to build water pumps only in all of our own cities. Therefore, according to this property, we come to ...

Project 12 re optimization of port management of switch background managementProject presentation 1. Why to use pointer The function's value is passed, and the function's arguments cannot be modified by calling the function. 2. Pointer definition What is the pointer The pointer is essentially an address value: #include <stdio.h> int mai ...

Preface The problem encountered in the previous development process is that the time in the message body is 8 hours less than the current time when the rabbitmq template is used to send messages. This is the time zone problem. Let's talk about why it appears. The previous configuration is as follows: @Bean public RabbitTemplate rabbitTempl ...