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poj 2142
Ms. Iyo Kiffa-Australis has a balance and only two kinds of weights to measure a dose of medicine. For example, to measure 200mg of aspirin using 300m ...
分类:其他好文   时间:2017-02-17 15:05:04    阅读次数:211
Python-Matplotlib2 Questions
Question 1: 列中有中文 Traceback (most recent call last): File "~/PycharmProjects/ltest/scripts/py_matlab.py", line 17, in <module> ages, weights, heights ...
分类:编程语言   时间:2017-02-16 13:41:54    阅读次数:271
nested exception is java.io.FileNotFoundException: Could not open ServletContext resource
注意这段配置尽量写在靠前的位置,因为在tomcat启动后web项目会先初始化上下文,我们这段配置正是指定了上下文配置的文件位置,在上下文初始化完成之后才应当继续加载其余各种配置,而我们的springMVC的servlet仅仅是springMVC框架的相关配置,就好比struts2的配置一样,项目整体 ...
分类:编程语言   时间:2017-02-10 23:29:51    阅读次数:484
Oracle 表连接方式
1、嵌套循环联结(NESTED LOOPS)2、哈希联结(HASH JOIN)3、排序合并联结(MERGE JOIN)4、半联结(in/exists)5、反联结(not in/not exists)6、笛卡儿联结(MERGE JOIN CARTESIAN)7、外连联结 left outer join ...
分类:数据库   时间:2017-02-06 21:09:36    阅读次数:257
TOJ-1317 Median Weight Bead
There are N beads which of the same shape and size, but with different weights. N is an odd number and the beads are labeled as 1, 2, ..., N. Your tas ...
分类:其他好文   时间:2017-01-25 14:29:35    阅读次数:173
POJ3687Labeling Balls
Labeling Balls Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14278 Accepted: 4162 Description Windy has N balls of distinct weights from ...
分类:其他好文   时间:2017-01-24 20:14:48    阅读次数:218
HASH的dig方法判断key是否存在及是否有值
dig(key, ...) → objectclick to toggle source Extracts the nested value specified by the sequence of idx objects by calling dig at each step, returning ...
分类:其他好文   时间:2017-01-22 12:02:12    阅读次数:262
多表连接的三种方式详解 HASH JOIN MERGE JOIN NESTED LOOP
在多表联合查询的时候,如果我们查看它的执行计划,就会发现里面有多表之间的连接方式。 之前打算在sqlplus中用执行计划的,但是格式看起来有点乱,就用Toad 做了3个截图。 从3张图里我们看到了几点信息: 1. CBO 使用的ALL_ROWS模式 Oracle Optimizer CBO RBO ...
分类:其他好文   时间:2017-01-20 11:05:42    阅读次数:299
Convolutional Neural Networks (CNNs / ConvNets) Notes
Convolutional Neural Networks Convolutional Neural Networks are made up of neurons that have learnable weights and biases. Each neuron receives some i ...
分类:Web程序   时间:2017-01-17 15:22:09    阅读次数:509
org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is org.apache.commo ...
分类:数据库   时间:2017-01-17 09:33:42    阅读次数:406
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