两种单链表（没有头节点 和 带有头节点）的创建 及 基本操作（增删改查）
带有头节点：
#include "pch.h"
#include "pch.h"
#include "SingleList.h"
#include <iostream>
using namespace std;
int main(void)
{
SingleList list;
list.create(10);
list.print();
cout << "创...
Java 中string与date(日期)格式之间的转换
1.string格式转化为Date对象：
//把string转化为date
DateFormat fmt =new SimpleDateFormat("yyyy-MM-dd");
Date date = fmt.parse(szBeginTime);
test.setStartTime(date);
注意：引入的是：java.text.DateFormat
2.Date格式转化...
将两条有序单链表合成一条链表（两种写法）
整体代码：
typedef
struct Node {
int data;
struct Node * next;
}Node;
class SingleList
{
Node head;
int length;
static int I;
public:
SingleList();
void create(int len);
void insert(int index,in...
单链表的反转（转置）
template<class Type>
inline void Link<Type>::InverseLink()
{
Node<Type> * current = head;
Node<Type> * next = NULL;
Node<Type> * result = NULL;
while ( current )
{
...
SQL Server 入门 及 基本的操作（数据库的增删改查）
database management system (DBMS)数据管理系统
DataBase Administrator（DBA）数据库数据管理员
一、数据库的基本概念
1、数据模型
1、层次模型
2、网状模型
3、关系模型（用表来管理数据）
2、关系型数据库语言
1、数据定义语言（DDL）
语句
功能
CREATE
...
数据库（My SQL 、SQL Server）的数据类型
数字类型
整形
浮点/定点型
日期和时间类型
字符类型
字符集与编码
CHAR和VARCHAR
BINARY和VARBINARY
BLOB和TEXT
ENUM和SET类型
选择合适的数据类型
参考资料
数字类型
整形
在整数类型中，按照取值范围和存储方式不同，分为tinyint、smallint、mediumint、int和bigint这 5...
数据结构预算法 循环列队 C / C++
#pragma once
typedef
struct Queue {
int * m_Queue;
int m_length;
int m_capacity;
}SqQueue;
class RoundQueue
{
SqQueue queue;
int m_head;
int m_tail;
public:
RoundQueue(int capacity);//InitQue...
surrounded-regions leetcode C++
Given a 2D board containing'X'and'O', capture all regions surrounded by'X'.
A region is captured by flipping all'O's into'X's in that surrounded region .
For example,
X X X X X O O X X X O X X O X ...
triangle leetcode C++
Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.
For example, given the following triangle
[ [2], [3,4], [6,5,7], [4,1,8,3...
valid-palindrome leetcode C++
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
For example, "A man, a plan, a canal: Panama"is a palindrome. "race a car"is not a palind...
word-break-ii leetcode C++
Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word.
Return all such possible sentences.
For example, given s ="catsan...
word-break leetcoder C++
Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words.
For example, given s ="leetcode", dict =["leet", "cod...
word-ladder leetcoder C++
Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that:
Only one letter can be changed at a time Each intermediate word mu...
TypeError: 'encoding' is an invalid keyword argument for this function 解决Python 2.7
在python2.7中这样调用代码
open('file/name.txt','r',encoding= 'utf-8').read()
会出现
TypeError: 'encoding' is an invalid keyword argument for this function
这样的错误
需要将代码修改为
import io
io.open('file/name.txt...
Python matplotlib 概率论与数理统计 伯努利分布 二项分布
Python 代码实现 二项分布
import numpy as np
import matplotlib.pyplot as plt
import math
from scipy import stats
n = 100
p = 0.05
k = np.arange(0,n)
binomial = stats.binom.pmf(k,n,p)
plt.plot(k,binomial,'...
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