Minimum Inversion Number
Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u
Description
For a given sequence of numbers a1, a2, ..., an, if we move the first m >= 0 numbers to the end of the seqence, we will obtain another sequence. There are totally n such sequences as the following:
a1, a2, ..., an-1, an (where m = 0 - the initial seqence)
a2, a3, ..., an, a1 (where m = 1)
a3, a4, ..., an, a1, a2 (where m = 2)
...
an, a1, a2, ..., an-1 (where m = n-1)
You are asked to write a program to find the minimum inversion number out of the above sequences.
Input
Output
Sample Input
1 3 6 9 0 8 5 7 4 2
Sample Output
#include <stdio.h>
#include <algorithm> using namespace std; int a[];
struct Node{
int l,r,num;
}tree[]; void Build(int n,int x,int y){
tree[n].l = x;
tree[n].r = y;
tree[n].num = ;
if(x == y){
return;
}
int mid = (x + y) / ;
Build(*n,x,mid);
Build(*n+,mid+,y);
} void Modify(int n,int x){
int l = tree[n].l;
int r = tree[n].r;
int mid = (l + r) / ;
if(x == l && x == r){
tree[n].num = ;
return;
}
if(x <= mid) Modify(*n,x);
else Modify(*n+,x);
tree[n].num = tree[*n].num + tree[*n+].num;
} int Query(int n,int x,int y){
int l = tree[n].l;
int r = tree[n].r;
int mid = (l + r) / ;
int ans = ;;
if(x == l && y == r)
return tree[n].num;
if(x <= mid) ans += Query(*n,x,min(mid,y));
if(y > mid) ans += Query(*n+,max(mid+,x),y);
return ans;
}
int main(){
//freopen ("a.txt" , "r" , stdin ) ;
int n,sum,ans;
int i,j; while(scanf("%d",&n) != EOF){
sum = ;
Build(,,n);
for(i = ;i <= n;i++){
scanf("%d",&a[i]);
Modify(,a[i]);
sum += Query(,a[i]+,n);
}
ans = sum;
for(i = ;i < n;i++){
sum = sum + (n - - a[i]) - a[i];
if(sum < ans)
ans = sum;
}
printf("%d\n",ans);
}
}
Minimum Inversion Number的更多相关文章
- HDU 1394 Minimum Inversion Number ( 树状数组求逆序数 )
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1394 Minimum Inversion Number ...
- HDU 1394 Minimum Inversion Number(最小逆序数 线段树)
Minimum Inversion Number [题目链接]Minimum Inversion Number [题目类型]最小逆序数 线段树 &题意: 求一个数列经过n次变换得到的数列其中的 ...
- HDU 1394 Minimum Inversion Number(最小逆序数/暴力 线段树 树状数组 归并排序)
题目链接: 传送门 Minimum Inversion Number Time Limit: 1000MS Memory Limit: 32768 K Description The inve ...
- ACM Minimum Inversion Number 解题报告 -线段树
C - Minimum Inversion Number Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d &a ...
- 【hdu1394】Minimum Inversion Number
Problem Description The inversion number of a given number sequence a1, a2, ..., an is the number of ...
- [hdu1394]Minimum Inversion Number(树状数组)
Minimum Inversion Number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java ...
- HDU-1394 Minimum Inversion Number 线段树+逆序对
仍旧在练习线段树中..这道题一开始没有完全理解搞了一上午,感到了自己的shabi.. Minimum Inversion Number Time Limit: 2000/1000 MS (Java/O ...
- 逆序数2 HDOJ 1394 Minimum Inversion Number
题目传送门 /* 求逆序数的四种方法 */ /* 1. O(n^2) 暴力+递推 法:如果求出第一种情况的逆序列,其他的可以通过递推来搞出来,一开始是t[1],t[2],t[3]....t[N] 它的 ...
- HDU 1394 Minimum Inversion Number(线段树/树状数组求逆序数)
Minimum Inversion Number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java ...
随机推荐
- 自己写的一个关于Linq to Entity 动态查询的例子
这两天一直想写一个动态查询的方式,先是晚上查询了一下,发现大家写的差不多都是一样的[如:http://www.cnblogs.com/ASPNET2008/archive/2012/10/28/274 ...
- java <? super Fruit>与<? extends Fruit>
package Test2016; import java.util.ArrayList; import java.util.List; public class Test2016 { public ...
- 一句话概括下spring框架及spring cloud框架主要组件
作为java的屌丝,基本上跟上spring屌丝的步伐,也就跟上了主流技术.spring 顶级项目:Spring IO platform:用于系统部署,是可集成的,构建现代化应用的版本平台,具体来说当你 ...
- javascript中数组Array的方法
一.常用方法(push,pop,unshift,shift,join)push pop栈方法,后进先出var a =[1,2,3];console.log(a.push(40)); //4 返回数组的 ...
- JS模式:Mixin混合模式,=_=!就是常见的Object.create()或者_extend()
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/ ...
- 44.Android之Shape设置虚线、圆角和渐变学习
Shape在Android中设定各种形状,今天记录下,由于比较简单直接贴代码. Shape子属性简单说明一下: gradient -- 对应颜色渐变. startcolor.endcolor就不多说 ...
- PHP配置,php.ini以及覆盖问题
在部署一个cms项目到服务器上的时候,因为cms的模板比较老,服务器上用的php是5.3.3版(大于5.3,可以认为是新的),有些页面会显示"deprecated"类别的错误信息. ...
- Tomcat Can't load AMD 64-bit .dll on a IA 32
Java.lang.UnsatisfiedLinkError: C:\apache\apache-tomcat-7.0.14\bin\tcnative-1.dll: Can't load AMD 64 ...
- C#文件复制功能
目的是将用户自定义文件复制到指定文件夹并且能查看该文件,下面是个人做的源码: sing System; using System.Collections.Generic; using System.C ...
- C#通过编程方式实现Ping
代码是照着书敲的,贴出来方便平时参考 using System; using System.Collections.Generic; using System.Linq; using System.T ...