Programmer Group

1. Three ways to define arrays Array: a collection that stores a set of data of the same data type public class TestDemo { public static void main(String[] args) { int[] array = {1,2,3,4,5,6,7}; // Array defined and initialization [] cannot put any numbers // matters needing attention: // 1. When defining ...

Chapter 3 stack and queue Part I stack 1. Definition of stack A stack is a linear table that is restricted to insert and delete operations only at the end of the table. We call the end that allows insertion and deletion as the top of the stack, the other end as the bottom of the stack, and the stack without any data elements as an empty ...

brief introduction Although logical regression bears the name of regression, it actually does classification. The general form of regression can be expressed as: f ( x ) = ...

1, Foreword A classmate asked: could you elaborate on the diff algorithm. To put it simply: diff algorithm is an optimization method, which compares the difference between the two modules before and after, and the process of repairing (updating) the difference is called patch, also known as patching. The article mainly solves the follow ...

Doorman Topic overview Problem solution Sister's favorite tree set tree optimization dp. First, it should be easy to come up with a d p dp The idea of dp. As Niuniu has only two movements in the whole process, stay at the door, run ...

Related concepts stability Stable: if a was in front of b and a=b, a will still be in front of b after sorting.Unstable: if a was originally in front of b and a=b, a may appear after b after sorting. Time complexity In general, the number of times the basic operation is repeated in the algorithm is a function of the problem scale n, which i ...

Understanding data structures Data structure is a way for computers to store and organize data. A data structure is a collection of data elements that have one or more specific relationships with each other-- Baidu Encyclopedia We understand data structures from our own perspective. Data structure is a way for computers to store and organize ...

Catalog One, Kruskal Two, the actual battle of Kruskal POJ 2349 Arctic Network Force buckle   1584. Minimum cost of connecting all points Three, Prim Fourth, Prim Actual Warfare Force buckle   1584. Minimum cost of connecting all points One, Kruskal Algorithmic ideas: Start to think of each point as a separate tree. Each ti ...

Concepts of inheritance: Genetic algorithm is a computational model that simulates the natural selection and genetic mechanism of Darwin's biological evolution theory. It is a method to search for the best solution by simulating the natural evolution process. The characteristics of genetic algorithms: Common features of search algorithms are ...

Code template: #include <iostream> using namespace std; const int N = 1000010; int q[N]; void quick_sort(int q[], int l, int r) { if (l >= r) return; int i = l - 1, j = r + 1, x = q[l + r >> 1]; while (i < j) { do i ++ ; while (q[i] < x); do j -- ; while (q[j] > x); if (i &lt ...