<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[孤独的娃娃菜]]></title><description><![CDATA[Just for glory]]></description><link>https://blog.youkuaiyun.com/pack__pack</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; pack__pack]]></copyright><item><title><![CDATA[Mysql 面试练手题]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/120608719</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/120608719</guid><author>pack__pack</author><pubDate>Mon, 04 Oct 2021 21:55:32 +0800</pubDate><description><![CDATA[从网络收集的一些题，用来面试前练手，如有任何问题留言给我。侵删。

1.1查询" 01 "课程比" 02 "课程成绩高的学生的信息及课程分数

select * from (select * from sc where cid = '01') a

inner join

(select *from sc where cid = '02') b on a.sid=b.sid;

1.2.查询存在" 01 "课程但可能不存在" 02 "课程的情况(不存在时显示为 null )

select * from .]]></description><category></category></item><item><title><![CDATA[Python 解决对于引用模块而导致执行代码运行的方法]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/108803880</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/108803880</guid><author>pack__pack</author><pubDate>Fri, 25 Sep 2020 21:01:14 +0800</pubDate><description><![CDATA[在引用模块中的执行代码中添加判断语句形如


if __name__ = '__main__':

Practice22.py


def model():
    print("one")


def model1():
    print("two")


def model2():
    print("three")


if __name__ == '__main__':
    model()
    model1()

Practice22Run1.py


import Practice2.]]></description><category></category></item><item><title><![CDATA[Pat B1033]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/81711530</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/81711530</guid><author>pack__pack</author><pubDate>Wed, 15 Aug 2018 21:30:52 +0800</pubDate><description><![CDATA[
#include &amp;lt;iostream&amp;gt;
#include &amp;lt;cstdio&amp;gt;
#include &amp;lt;cstring&amp;gt;

using namespace std;

int main(){
    int in[200];


    char scch;
    memset(in,0,sizeof(int) * 200);

    scch = getchar...]]></description><category></category></item><item><title><![CDATA[Pat  A 1082 Read Number in Chinese]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/81099496</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/81099496</guid><author>pack__pack</author><pubDate>Wed, 18 Jul 2018 15:52:32 +0800</pubDate><description><![CDATA[先把最常见的情况写出来，不断在中间加上一些判断条件就可以了。

分享一些测试数据：


0
ling


8
ba


808080808
ba Yi ling ba Bai ling ba Wan ling ba Bai ling ba


-880808080
Fu ba Yi ba Qian ling ba Shi Wan ba Qian ling ba Shi


800000008
ba...]]></description><category></category></item><item><title><![CDATA[Pat A1005 Spell It Right]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/81057215</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/81057215</guid><author>pack__pack</author><pubDate>Sun, 15 Jul 2018 21:27:00 +0800</pubDate><description><![CDATA[英语单词，不要用string进行存放，用char存放。For example: char str [10][10] = {&quot;zero&quot;,&quot;one&quot;,&quot;two&quot;,&quot;three&quot;,&quot;four&quot;,&quot;five&quot;,&quot;six&quot;,&quot;seven&quot;,&quot;eight&quot;,&quot;nine&quot;};很简单的一道题。#include &amp;lt]]></description><category></category></item><item><title><![CDATA[Pat B1024/A1073科学计数法]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/81053360</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/81053360</guid><author>pack__pack</author><pubDate>Sun, 15 Jul 2018 15:35:38 +0800</pubDate><description><![CDATA[字符串处理问题，不是很难。#include &amp;lt;iostream&amp;gt;
#include &amp;lt;cstdio&amp;gt;
#include &amp;lt;algorithm&amp;gt;
#include &amp;lt;cstring&amp;gt;

using namespace std;

const int MaxVector = 10005;

int main(){
    char ch[MaxVecto...]]></description><category></category></item><item><title><![CDATA[pat B 1028 人口普查]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80978402</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80978402</guid><author>pack__pack</author><pubDate>Mon, 09 Jul 2018 22:21:37 +0800</pubDate><description><![CDATA[作死的选择算年龄，答非所问，不是好习惯，错了都不知哪里错了 - -、、、、、#include &amp;lt;iostream&amp;gt;
#include &amp;lt;cstdio&amp;gt;
#include &amp;lt;algorithm&amp;gt;
#include &amp;lt;cstdlib&amp;gt;

using namespace std;

struct birth{
    char *ch;
    int a...]]></description><category></category></item><item><title><![CDATA[C/C++ 精度损失下的浮点数比较]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80898907</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80898907</guid><author>pack__pack</author><pubDate>Tue, 03 Jul 2018 15:37:14 +0800</pubDate><description><![CDATA[等于运算符(==)const double eps = 1e-8;
#define Equ(a,b) (fabs((a)-(b))&amp;lt;(eps))大于运算符(&amp;gt;)const double eps = 1e-8;
#define More(a,b) (((a)-(b))&amp;gt;(eps))小于运算符(&amp;lt;)const double eps = 1e-8;
#define Less(a,...]]></description><category></category></item><item><title><![CDATA[hdu 1007 最近点对问题]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80820762</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80820762</guid><author>pack__pack</author><pubDate>Sat, 30 Jun 2018 09:51:57 +0800</pubDate><description><![CDATA[       给出二维平面上的n个点，求其中最近的两个点的距离的一半。　　 输入包含多组数据，每组数据第一行为n，表示点的个数；接下来n行，每行一个点的坐标。当n为0时表示输入结束，每组数据输出一行，为最近的两个点的距离的一半。Sample Input2
0 0
1 1
2
1 1
1 1
3
-1.5 0
0 0
0 1.5
0Sample Output0.71
0.00
0.75题解：    ...]]></description><category></category></item><item><title><![CDATA[C qsort 函数改写比较函数]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80774562</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80774562</guid><author>pack__pack</author><pubDate>Fri, 22 Jun 2018 15:37:25 +0800</pubDate><description><![CDATA[#include &amp;lt;iostream&amp;gt;
#include &amp;lt;algorithm&amp;gt;
#include &amp;lt;cstdlib&amp;gt;
using namespace std;
int comp(const void* a,const void* b){
    int *p1,*p2;
    p1 =  (int *)a;
    p2 =  (int *)b;
    r...]]></description><category></category></item><item><title><![CDATA[字符串排序/字典序最小拼接方式]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80774245</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80774245</guid><author>pack__pack</author><pubDate>Fri, 22 Jun 2018 15:18:09 +0800</pubDate><description><![CDATA[改写cmp函数#include &amp;lt;iostream&amp;gt;
#include &amp;lt;algorithm&amp;gt;

using namespace std;

bool cmp(const string &amp;amp;a,const string &amp;amp;b){
    return a+b &amp;lt; b+a;
}

int main(){
    string str[100];
    i...]]></description><category></category></item><item><title><![CDATA[C/C++ sort从大到小排序]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/80773972</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/80773972</guid><author>pack__pack</author><pubDate>Fri, 22 Jun 2018 15:03:55 +0800</pubDate><description><![CDATA[重写cmp函数#include &amp;lt;iostream&amp;gt;
#include &amp;lt;algorithm&amp;gt;

using namespace std;

bool cmp(int a,int b){
    return a &amp;gt; b;
}

int main(){
    int a[] = {5,3,7,3,9,4};
    sort(a,a+6,cmp);
    for(...]]></description><category></category></item><item><title><![CDATA[PAT L1-005. 考试座位号 Java超时解决方案]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/79672251</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/79672251</guid><author>pack__pack</author><pubDate>Fri, 23 Mar 2018 20:27:12 +0800</pubDate><description><![CDATA[每个PAT考生在参加考试时都会被分配两个座位号，一个是试机座位，一个是考试座位。正常情况下，考生在入场时先得到试机座位号码，入座进入试机状态后，系统会显示该考生的考试座位号码，考试时考生需要换到考试座位就座。但有些考生迟到了，试机已经结束，他们只能拿着领到的试机座位号码求助于你，从后台查出他们的考试座位号码。

输入格式：

输入第一行给出一个正整数N（&amp;lt;=1000），随后N行，每行给出一个...]]></description><category></category></item><item><title><![CDATA[struts2中struts.xml按照一定顺序排列]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/78767827</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/78767827</guid><author>pack__pack</author><pubDate>Sun, 10 Dec 2017 21:43:16 +0800</pubDate><description><![CDATA[The content of element type "package" must match "(result-types?,interceptors?,default-interceptor-ref?,default-action-ref?,default-class-ref?,global-results?,global-allowed-methods?,global-exception-]]></description><category></category></item><item><title><![CDATA[学习Struts2时，使用Idea在用OGNL代码变红。]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/78184045</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/78184045</guid><author>pack__pack</author><pubDate>Mon, 09 Oct 2017 16:37:10 +0800</pubDate><description><![CDATA[发生红名，但不影响运行。
把idea针对JSP文件的检测级别降低点，File -> Settings -> Editor -> Inspections，选择对应的文件类型，取消勾即可。]]></description><category></category></item><item><title><![CDATA[使用struts2 由pojo类跳转到jsp页面再跳转到jsp页面使用后退时，报空指针异常]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/78072273</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/78072273</guid><author>pack__pack</author><pubDate>Sat, 23 Sep 2017 17:43:37 +0800</pubDate><description><![CDATA[使用struts 由pojo类跳转到(1).jsp页面再跳转到(2).jsp页面使用后退时，报空指针异常。
原因:当由pojo类跳转到(1).jsp时使用的是框架跳转，当由(2).jsp页面后退到(1).jsp时，实际上是后退到原来的pojo类上，所以在后退时(1).jsp使用任何的request,session,都会报出空指针异常。
解决方案，在Pojo类中，加入类似这样的代码: if(us]]></description><category></category></item><item><title><![CDATA[struts2 使用动态调用时出现的问题]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/78057324</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/78057324</guid><author>pack__pack</author><pubDate>Thu, 21 Sep 2017 21:48:23 +0800</pubDate><description><![CDATA[This method: add for action user1 is not allowed!

这是因为 struts2.5 为了提升安全性，添加了 allomethod 。
在struts.xml 的package下添加一行regex:.*即可。]]></description><category></category></item><item><title><![CDATA[Servlet，当由浏览器直接调用servlet时，出现的The specified HTTP method is not allowed for the requested resource.]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/77718681</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/77718681</guid><author>pack__pack</author><pubDate>Wed, 30 Aug 2017 16:49:40 +0800</pubDate><description><![CDATA[The specified HTTP method is not allowed for the requested resource.]]></description><category></category></item><item><title><![CDATA[A simple java application.]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/74779796</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/74779796</guid><author>pack__pack</author><pubDate>Sun, 09 Jul 2017 21:11:36 +0800</pubDate><description><![CDATA[1、访问修饰符(public protected default private)
用于控制其他部分对这段代码的访问级别。


2、类(class)
表明java程序中的全部内容都包含在类中。刚开始 的学习仅仅将类作为一个加载程序逻辑的容器，程序逻辑定义了应用程序的行为。


3、类名命名规范
类名是以大写字母开头的名词。，若由多个单词组成，每个单词的第一个字母应该大写。]]></description><category></category></item><item><title><![CDATA[矩阵快速幂]]></title><link>https://blog.youkuaiyun.com/pack__pack/article/details/71507418</link><guid>https://blog.youkuaiyun.com/pack__pack/article/details/71507418</guid><author>pack__pack</author><pubDate>Tue, 09 May 2017 20:51:04 +0800</pubDate><description><![CDATA[f(1)=1, f(2)=1 , f(n)=a*f(n-1)+b*f(n-2)，输出n和m，求 f(n) % m
 的值。n是1到10^18次方的数。
如果按照朴素计算的话，由于18次方，还是特别慢。
如果使用矩阵形如，dp[n]=A​n−1​​⋅dp[1]
则f(n) :
struct matrix{
    long long ab[k][k];
};

matrix mul(mat]]></description><category></category></item></channel></rss>