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15.web开发-SpringMVC自动配置概览

Spring Boot provides auto-configuration for Spring MVC that works well with most applications.(大多场景我们都无需自定义配置) The auto-configuration adds the following features on top of Spring’s defaults: Inclusion of ContentNegotiatingViewResolver and Bea

python之贪婪算法

贪婪算法贪婪算法也称为最优算法，这种算法并不是最准确的答案，但确认最接近答案的近似算法。这时候有人会问，不是最准确的答案我要她干嘛？但是在日常中，我们有时候会遇到一些我们无法处理的问题，甚至是要花费成吨的资源也无法很好解决的问题这时候我们可以考虑使用近似算法，来节约资源

IDEA项目结构出现 0% methods,0% lines covered

IDEA项目结构后出现 0% methods,0% lines covered, 如图解决上述问题，只需要使用快捷键 Ctrl + Alt + F6，在弹出窗口中取消项目前面的√, 点击show selected 后续会持续更新一些IDEA中的操作。

redis 集群 slots are covered by nodes.

原因数据数据损坏。需要修复 1、检测 redis-cli --cluster check 127.0.0.1:7000 2、检测结果 slots are covered by nodes3、进行修复 redis-cli --cluster fix 127.0.0.1:7000

08-贪婪算法

数据结构和算法基于《算法图解》—Aditya Bhargava 和《数据结构》—严蔚敏第8章贪婪算法贪婪算法的优点：简单易行，让每一步都选择局部最优解，最终得到的就是全局最优解。贪婪算法是近似算法：在获得精确解需要的时间太长时，可以使用近似算法。判断近似算法优劣的标准如下：

Core Python | 2 - Core Python: Getting Started | 2.2 - Installing and Starting Python | 2.2.7 - Summ

Congratulations! You've taken your first steps in Python, and you're well on your way to reading and writing much more sophisticated Python programs. In this module, we saw how to download and install Python on Windows, Linux and macOS. We cover

Plugin execution not covered by lifecycle configuration

自学springboot，创建好后pom.xml报错：Plugin execution not covered by lifecycle configuration，更新maven也不好使，解决步骤如下： 1.进入【Window】-【Preferences】-【Maven】-【Lifecycle Mapping】如下图： 2.上图路径并不存在，到eclipse的安装目录下的plugins下的org.eclips

【算法图解】——集合覆盖问题

文章目录集合覆盖问题州集合，电台字典电台选择集合覆盖问题覆盖问题要求不会重复——采用set（）假设你要办一个广播电台，要让所有的8个州都听到，你要选择广播电台，如何选择尽可能少的广播电台州集合，电台字典 # 包含所有州的集合 states_needed = set(['mt', 'wa', 'or', '

【C&C++】1005 继续(3n+1)猜想 (25 分)

这题做第二遍的时候，没有第一遍那么顺利。。。有目录~C 25'/25'C++错误代码对错误代码的分析正确代码 25'/25' C 25’/25’ #include<stdio.h> #include<stdlib.h> #define MAX 100 int num[MAX], key[MAX], covered[MAX * MAX]; int key_count = 0; //关键数的个数 int

[Codeforces 1253E] Antenna Coverage

Dynamic programming solution State: dp[i]: the minimum cost to cover all positions from[0, i]. (left shift by 1 to get 0 index) // if position i is already covered, then dp[i] is the same with dp[i - 1] or 0 if i is 0 dp[i] = i == 0 ? 0 : dp[i - 1];　　

Python实现的贪婪算法

# 使用Python实现贪婪算法# 集合覆盖问题 # 假设你办了个广播节目，要让全美50个州的听众都收听到。为此，你需要决定在哪些广播台播出。在每个广播台播出都需要支出费用，因此你力图在尽可能少的广播台播出 # 1.创建一个列表，其中包含要覆盖的州 states_needed = set(["mt", "wa", "or"

源码分析----SpringBoot中SpringMVC配置原理

官方文档 29.1.1 Spring MVC Auto-configuration Spring Boot provides auto-configuration for Spring MVC that works well with most applications. The auto-configuration adds the following features on top of Spring’s defaults: Inclusion of ContentNegotia

POJ-3020-Antena Placement（最小路径覆盖）

链接： https://vjudge.net/problem/POJ-3020 题意： The Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The most striking reason why they got the job, is their discovery of a new, highly no

[ERR] Not all 16384 slots are covered by nodes.

早些时间公司redis集群环境的某台机子冗机了，同时还导致了部分slot数据分片丢失；在用check检查集群运行状态时，遇到错误； [root@node01 src]# ./redis-trib.rb check172.168.63.202:7000 Connecting to node 172.168.63.202:7000: OK Connecting to node 172.168.63.203:7000: OK

Maven经典错误之二- Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:aspectj-mave

一个错误示例： maven使用子父项目继承关系，子项目引用了父项目，子项目parent标签处报错如下： - Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:******* (execution: default, phase: validate) 错误。解决方法：给父工程pom.xml加上<pluginMa

POJ 3020 Antenna Placement 最大匹配

Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6445 Accepted: 3182 Description The Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The most st

POJ 3020：Antenna Placement（无向二分图的最小路径覆盖）

Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6334 Accepted: 3125 Description The Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The m

cf1000 C. Covered Points Count

#include<bits/stdc++.h> using namespace std; typedef long long ll; map<ll ,int > mp; ll cnt[200010]; int main() { int n; scanf("%d",&n); for(int i=1;i<=n;i++) { ll l,r; scanf("%lld%lld"