留坑(p.254) #include<cstdio> #include<cstring> #include<cstdlib> #include<algorithm> #include<iostream> using namespace std; void setIO(const string& s) { freopen((s + ".in").c_str(), "r", stdin); freope…

题目大意:给出1~n的某个排列,问由升序变到这个排列最少需要几次操作.操作1:将头两个数交换:操作2:将头一个数移动最后一个位置. 题目分析:反过来考虑,将这个排列变为升序排列,那么这个变化过程实际上就是冒泡排序的过程.将这个排列视为环形的,操作1为交换过程,操作2为查找逆序对的过程.那么,将升序排列变成给出的排列就是打破顺序的过程,或者说是还原为无序的过程.那么只需要将冒泡排序的过程逆过来即可,将操作2中“将头上的数移到尾上”改为“把最后一个数移到最前面”,最后将操作过程倒序输出即可. 代码如…

逆序做,逆序输出 紫书上的描述有点问题 感觉很经典 ans.push_back(2); a.insert(a.begin(),a[n-1]); a.erase(a.end()-1); a.push_back(k);vector 的操作 没有证明这样做的复杂度要求... #include<cstdio> #include<algorithm> #include<vector> using namespace std; int n; vector<int> a,…

D. Generating Sets time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a set Y of n distinct positive integers y1, y2, ..., yn. Set X of n distinct positive integers x1, x2, ...,…

Xcode8 pod install 报错 "Generating Pods project Abort trap 今天在写一个新项目的时候,使用cocoapods在执行 $ pod install 的时候,终端提示 Generating Pods project Abort trap: 6 解决办法: 删除所有cocoapods gems, 依次执行以下命令: sudo gem uninstall cocoapods sudo gem uninstall cocoapods-core sudo…

D. Generating Sets time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a set Y of n distinct positive integers y1, y2, ..., yn. Set X of n distinct positive integers x1, x2, ...,…

[转]今天在调试springMVC的时候,在将一个对象返回为json串的时候,浏览器中出现异常: The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers (). 从网上查了下,说是让配置下json转化bean: <bean…

More info here: http://blogs.msdn.com/b/yojoshi/archive/2011/05/14/xml-serialization-and-deserialization-entity-classes-with-xsd-exe.aspx Introduction Many time we come across the need of parsing XML document and creating entities. These entities are…

Doc ID 461911.1 Patch 6602742 Applies to: Oracle Database - Enterprise Edition - Version 10.2.0.3 and later Information in this document applies to any platform.***Checked for relevance on 09-Nov-2011*** Symptoms After applying patch set 10.2.0.3, th…

Part 1: Moments Definition 1 For each integer $n$, the nth moment of $X$, $\mu_n^{'}$ is \[\mu_{n}^{'} = EX^n.\] The nth central moment of $X$, $\mu_n$, is \[ \mu_n = E(X-\mu)^n,\] where $\mu=\mu_{1}^{'}=EX$. Definition 2 The variance of a random var…