Programming VIP

01. - Function - Return Value (1). Find the sum of any number You can specify the return value of a function by returning def fn(*nums): # Define a variable to hold the result result = 0 # Traversing through tuples and accumulating elements in tuples for n in nums: result ...

In the last section, we implemented a basic crawler, but we use regular expressions to extract page information. After using them, we will find that constructing a regular expression is tedious, and in case there is a mistake, it may lead to matching failure. So we use regularization to extract page inf ...

Share how to use CSS3 only to realize single label dynamic sunshine, rain and snow. The key points of technology are "single label" and "pure CSS". Look at the final results first: Look at the HTML code again: <! - Sunny - > <div class="weather sunny"></div> <! ...

I. THE CONCEPT OF POLYMORPHISM 1. What is polymorphism? A thing has a variety of forms, that is, to face the various states of the object. Official Interpretation: Multiple different classes of objects can respond to the same method and produce different results It is emphasized that polymorphism is not a special grammar, but a state and ch ...

polymorphic Concept: A thing has many different forms. For example, water is solid and gaseous. Bumblebee: Autobots, Cars, Airplanes Official Interpretation: Multiple different classes of objects can respond to the same method and produce different results First of all, it is emphasized that polymorphism is not a special grammar, but a state, a ...

Links: Lougu Valley            POJ Title Description Farmer John wants to set up a telephone line at his farm. Unfortunately, the phone company is uncooperative, so he needs to pay for some of the cables required to connect his farm to the phone system. There are N (1 ≤ N ≤ 1,000) forlorn telephone poles conveniently numbered 1..N that ar ...

Topic link: https://ac.nowcoder.com/acm/contest/884/G Main idea of the title: Given a tree (A), then give (t) a question and ask how many connected subgraphs in (A) are isomorphic to the tree (B_i). \ (| A | Leq 2000, t Leq 10000, | B_i | Leq 12\) Problem Solution: This question is actually an enhanced version of Codeforces 762F, and the solu ...

How to use java data structure to write code Array data structure Initialization of arrays public static void main(String[] args) { int[] arrays = new int[5]; // Define and open up an array of length 3 // You can write the above code in two sentences int[] array = null; // Declare a variabl ...

Original Link: http://www.cnblogs.com/riasky/p/3508807.html An introduction to the Fisher search method Fischer search is a search algorithm that uses the Fibonacci sequence to search for specific elements from an ordered sequence. Bip ...

Day4 lseek #include <sys/types.h> #include <unistd.h> off_t lseek(int fd, off_t offset, int whence); Setting File Position Pointer The location function of the return value file pointer is similar to ftell Exercise 1: Implementing a function for calculating file size on a Linux syst ...