Programmer Group

Preface Recommend: Android learning PDF + Architecture Video + interview document + source notes In the actual development, the proportion of testing and debugging time is relatively high in the total development time. When repairing product defects, we usually need to observe the value of an object in real time. Although output can be in the f ...

Try to access instance variables directly inside the object When reading data inside an object, it should be read directly through instance variables, while when writing data, it should be written through attributes. _name = @"Jack" does not send messages through setter, and directly assigns values to variables, which is fast. For t ...

Question: There are several snacks n, packed in pipes (No. 1 n1-n1 n). Now you can take out a box of snacks every day. The contribution of each box of snacks to the answer is that the price of the snack multiplied by the number of days it was taken. Ask what is the maximum value. >> face <&l ...

wls has an integer n, he wants to divide the N numbers of 1_n into two groups, each group has at least one number, and make the sum of the two groups of numbers the largest common divisor, please output the largest common divisor. Input Enter an integer n in a row. 2 ≤ n ≤ 1, 000, 000, 000 Output Output a line and an integer to represent the an ...

Monthly Expense Go straight to Chinese Descriptions Give you a sequence of length N, and now let you cut them into M parts (so each one is continuous), and then each one has a sum[i]. The largest one is maxSum = max(sum[i]). Ask what is the minimum of this maximum value? input Multiple Input and Output GroupsThe first row of each set of da ...

meaning of the title Sequence single point modification, interval inquiry maximum continuous subsection sum. Maximum subsections and hard to update, but the single point of modification here reduces the difficulty and does not need to maintain tags. What we need to do now is to support queries with maximum subsections by maintaining several dat ...

How to Improve iOS Development Skills 1. Reading blogs: https://github.com/tangqiaoboy/iOSBlogCN Blog addresses of more than 40 iOS development bloggers 2. Reading: Reading a high-quality iOS development book every year 3. Watch WWDC Video 4. Look at Apple's official documents 5. Look at the code for open source projects 6. Write more code and ...

I. isa pointer structure union isa_t { isa_t() { } isa_t(uintptr_t value) : bits(value) { } Class cls; uintptr_t bits; #if SUPPORT_PACKED_ISA // extra_rc must be the MSB-most field (so it matches carry/overflow flags) // nonpointer must be the LSB (fixme or get rid of it) // shiftcls must occupy th ...

import java.security.Key; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; /** * 3DES Encryption Tool Class * * @author liufeng * @date 2012-10-11 */ public class Des3 { // secret key private final static ...

Preorder Throughout every high-quality project, whether on the web side or in the development of native applications, pop-up windows are an indispensable part, which can directly determine the user experience to a large extent. For example, there is a very mature set of window UI display scenes in ios. Recently, I have been addicted to the re ...