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题意: 有一宝箱,宝箱上有一些锁,有n个人,每个人分管一些钥匙(每个锁对应无数个钥匙), 现给出n,m 求问至少需要多少锁才能存在一种钥匙分配方案使得: 1.至少m个人才可以打开锁. 2.任选m个人一定可以打开锁. 解法: 注意到每个种钥匙要有m-1个人没有,其中对于任意两个不完全相同的m-1个人的集合, 有两个集合没有的钥匙交为空. 所以对于每m-1个人都恰好对应一种钥匙. 所以至少需要$C(n,m-1)$个钥匙,当然,$C(n,m-1)$个钥匙一定可行.…
题目链接: D. Vanya and Treasure time limit per test 1.5 seconds memory limit per test 256 megabytes input standard input output standard output Vanya is in the palace that can be represented as a grid n × m. Each room contains a single chest, an the room…
A. Treasure Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/494/problem/A Description Malek has recently found a treasure map. While he was looking for a treasure he found a locked door. There was a string s written on the…
A. Treasure time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Malek has recently found a treasure map. While he was looking for a treasure he found a locked door. There was a string s writte…
D. Vanya and Treasure 题目连接: http://www.codeforces.com/contest/677/problem/D Description Vanya is in the palace that can be represented as a grid n × m. Each room contains a single chest, an the room located in the i-th row and j-th columns contains t…
time limit per test1.5 seconds memory limit per test256 megabytes inputstandard input outputstandard output Vanya is in the palace that can be represented as a grid n × m. Each room contains a single chest, an the room located in the i-th row and j-t…
这种情况可能是因为你输入错误的用户名密码达到10次,oracle给你锁住了. 解决方法: 首先 ~bash$ sqlplus /nolog SQL> conn sys/sys as sysdba; 然后从表dba_profiles中看看失败次数的上限(默认为10) SQL> select resource_name, limit from dba_profiles where resource_name = 'FILAED_LOGIN_ATTEMPTS'; RESOURCE_NAME LIMI…
由于我在前不久的一次项目调试的时候,将一条数据的ID与另一条数据的ID相同了,但不知为什么没有报错,当在页面发现问题时,删除这条数据时就报错了,oralce record is locked by another user  将锁图标打开也不行,于是找了网上很多解决方式,但说得都不尽详细,最后自己根据其他人的写法,最终将错误数据成功删除                       select session_id from v$locked_object; ; ALTER SYSTEM KIL…
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标题:working copy locked 提示:your working copy appears to be locked. run cleanup to amend the situation. 产生这种情况大多是因为上次svn命令执行失败且被锁定了. 如果cleanup没有效果的话只好手动删除锁定文件. cd 到svn项目目录下,然后执行如下命令 del lock /q/s 就把锁删掉了. 附图:…