错误原因：
exc_bad_access(code=1, address=0x789870)野指针错误，主要的原因是，当某个对象被完全释放，也就是retainCount，引用计数为0后。再去通过该对象去调用其它的方法就会出现野指针错误。
例如：
Person *jerry = [[Person alloc]init]; // retainCount引用计数为1
[jerry eat];...
分类：
移动开发 时间：
2014-07-22 23:05:16
阅读次数：
372
Agri-Net
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 36780
Accepted: 14825
Description
Farmer John has been elected mayor of his town! One of his campa...
分类：
其他好文 时间：
2014-07-22 23:04:15
阅读次数：
229
Little Vasya has received a young builder’s kit. The kit consists of several wooden bars, the lengths of all of them are known. The bars can be put one on the top of the other if their lengths are the...
分类：
其他好文 时间：
2014-07-22 23:01:53
阅读次数：
323
原pom.xml配置文件： 4.0.0 com.my.helloworld hello-world
1.0-SNAPSHOT Maven Hello World Project junit jun...
分类：
其他好文 时间：
2014-07-22 22:59:36
阅读次数：
374
【题目】
Your boss has just unearthed a roll of old computer tapes. The tapes have holes in them and might contain some sort of useful information. It falls to you to figure out what is written on them...
分类：
其他好文 时间：
2014-05-02 23:35:16
阅读次数：
526
Shaass has decided to hunt some birds. There are n horizontal electricity wires aligned parallel to each other. Wires are numbered 1 to n from
top to bottom. On each wire there are some oskols sitti...
分类：
其他好文 时间：
2014-05-02 20:48:26
阅读次数：
462
Problem DescriptionIgnatius has just come back
school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher
gives him a deadline o...
分类：
其他好文 时间：
2014-05-01 20:49:40
阅读次数：
563
版本不对的原因。具体在10.5.9下修改此参数即可解决问题。LoadFunction()
has an ACritical parameter. It is set to True by default, but can be set to
False for individual function...
分类：
系统相关 时间：
2014-05-01 20:14:57
阅读次数：
594
Steps:
1. backup database DBmirror on SQL1
2. backup database log
3. copy db and log backup files to SQL2
4. restore db with norecovery
5. restore log with norecovery
6. create endpoints on both...
分类：
数据库 时间：
2014-04-30 22:15:38
阅读次数：
414
Farm IrrigationTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5051 Accepted Submission(s): 2167Problem Description
Benny has a spacious far...
分类：
其他好文 时间：
2014-04-30 22:12:40
阅读次数：
264
