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HDU3926Hand in Hand(搜索 或 并查集)
Problem Description In order to get rid of Conan, Kaitou KID disguises himself as a teacher in the kindergarten. He knows kids love games and works out a new game called "hand in hand". Initiall...
分类:其他好文   时间:2015-03-19 23:59:41    阅读次数:435
分组统计:count,group by,having, order by
--统计男女生的总人数select COUNT(*) from Student where Sex='男'select COUNT(*) from Student where Sex='女'--统计每一个班级的总人数select COUNT(*) from Student where ClassId...
分类:其他好文   时间:2015-03-19 23:55:51    阅读次数:150
leetcode 题解 || Valid Parentheses 问题
problem: Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are...
分类:其他好文   时间:2015-03-19 22:08:16    阅读次数:105
MySQL大数据量快速分页实现(转载)
在mysql中如果是小数据量分页我们直接使用limit x,y即可,但是如果千万数据使用这样你无法正常使用分页功能了,那么大数据量要如何构造sql查询分页呢?般刚开始学SQL语句的时候,会这样写代码如下:代码如下复制代码SELECT * FROM table ORDER BY id LIMIT 10...
分类:数据库   时间:2015-03-19 18:02:21    阅读次数:218
Remove Element
Given an array and a value, remove all instances of that value in place and return the new length. The order of elements can be changed. It doesn't matter what you leave beyond the new length. #incl...
分类:其他好文   时间:2015-03-19 13:17:13    阅读次数:124
关于TOP (n) WITH TIES的运用
1 SELECT TOP (5) orderid, orderdate, custid, empid2 FROM Sales.Orders3 ORDER BY orderdate DESC, orderid DESC;4 5 SELECT TOP (5) WITH TIES orderid, ord...
分类:其他好文   时间:2015-03-19 06:20:19    阅读次数:142
Leetcode: Remove Element
题目: Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn’t matter what you leave beyond the new length. 这道题比...
分类:其他好文   时间:2015-03-18 23:25:51    阅读次数:290
Search for a Range
Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in the order of O(log n). If the target is not found in t...
分类:其他好文   时间:2015-03-18 23:18:45    阅读次数:170
PHP分页优化
最快select id,name,content,time,re_id,is_replay from tb_content where re_id = 0 and id between 19993 and 19998 order by id desc大于10000条以上用select id,nam....
分类:Web程序   时间:2015-03-18 17:44:50    阅读次数:164
mybatis字段名与类属性名不相同的冲突
新建一个表CREATE TABLE orders(order_id INT PRIMARY KEY AUTO_INCREMENT,order_no VARCHAR(20),order_price FLOAT);INSERT INTO orders(order_no, order_price) VAL...
分类:其他好文   时间:2015-03-18 17:42:00    阅读次数:137
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