Programmer Help

Reprinted from: https://blog.csdn.net/rpf2014/article/details/53116906 The last article introduced the operation of installation, addition, deletion, modification and query of FMDB This article is mainly about data query screening and common database statistical functions, which is convenient for later query and learni ...

Merge and sort: divide the problem into small problems and solve them recursively, and merge the answers obtained in different stages together. Combine two ordered arrays into one, give A=[1,2,3,4], B=[2,4,5,6], return [1,2,2,3,4,4,5,6]. Solution idea: compare the numbers in two series from the beginning, and take out ...

Continue to summarize the work of Java background 2 Preface Previously, I wrote a SSM to replace c3p0 data source with Druid: https://blog.csdn.net/larger5/article/details/79509895 Recently, projects are basically based on SpringBoot. Similarly, using Druid as data source is also a very simple operation and principle Cod ...

Quantitative stock selection is to use the method of quantity to judge whether a company is worth buying. According to a method, if the company meets the conditions of the method, it will be put into the stock pool, if not, it will be removed from the stock pool. There are many kinds of quantitative stock selection methods. Gen ...

1. Contents of file a.txt: the contents of each line are commodity name, price and quantity. apple 10 3 tesla 100000 1 mac 3000 2 lenovo 30000 3 chicken 10 3 Through code, it is constructed into this data type: [{'name':'apple','price':10,'amount':3}, {'name':'tesla','price':1000000,'amount':1}...] and calculate the total price. Answer: li = [] ...