博客
关于我
强烈建议你试试无所不能的chatGPT,快点击我
CF731C. Socks[DFS 贪心]
阅读量:6970 次
发布时间:2019-06-27

本文共 4968 字,大约阅读时间需要 16 分钟。

C. Socks
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output

Arseniy is already grown-up and independent. His mother decided to leave him alone for m days and left on a vacation. She have prepared a lot of food, left some money and washed all Arseniy's clothes.

Ten minutes before her leave she realized that it would be also useful to prepare instruction of which particular clothes to wear on each of the days she will be absent. Arseniy's family is a bit weird so all the clothes is enumerated. For example, each of Arseniy's n socks is assigned a unique integer from 1 to n. Thus, the only thing his mother had to do was to write down two integers li and ri for each of the days — the indices of socks to wear on the day i (obviously, li stands for the left foot and ri for the right). Each sock is painted in one of kcolors.

When mother already left Arseniy noticed that according to instruction he would wear the socks of different colors on some days. Of course, that is a terrible mistake cause by a rush. Arseniy is a smart boy, and, by some magical coincidence, he posses k jars with the paint — one for each of k colors.

Arseniy wants to repaint some of the socks in such a way, that for each of m days he can follow the mother's instructions and wear the socks of the same color. As he is going to be very busy these days he will have no time to change the colors of any socks so he has to finalize the colors now.

The new computer game Bota-3 was just realised and Arseniy can't wait to play it. What is the minimum number of socks that need their color to be changed in order to make it possible to follow mother's instructions and wear the socks of the same color during each of m days.

Input

The first line of input contains three integers nm and k (2 ≤ n ≤ 200 000, 0 ≤ m ≤ 200 000, 1 ≤ k ≤ 200 000) — the number of socks, the number of days and the number of available colors respectively.

The second line contain n integers c1, c2, ..., cn (1 ≤ ci ≤ k) — current colors of Arseniy's socks.

Each of the following m lines contains two integers li and ri (1 ≤ li, ri ≤ nli ≠ ri) — indices of socks which Arseniy should wear during thei-th day.

Output

Print one integer — the minimum number of socks that should have their colors changed in order to be able to obey the instructions and not make people laugh from watching the socks of different colors.

Examples
input
3 2 3 1 2 3 1 2 2 3
output
2
input
3 2 2 1 1 2 1 2 2 1
output
0
Note

In the first sample, Arseniy can repaint the first and the third socks to the second color.

In the second sample, there is no need to change any colors.


太水了 dfs然后每个cc里找出现次数最多的颜色用size-它 

问题是怎么找:

1.数组标记,TLE

2.map标记,200ms

3.扔一个数组里然后排序扫描,数组初始化用memset就TLE,在扫描同时清空数组78ms

//map 200ms #include 
#include
#include
#include
#include
using namespace std;const int N=2e5+5,M=2e5+5,INF=1e9+5;inline int read(){ char c=getchar();int x=0,f=1; while(c<'0'||c>'9'){
if(c=='-')f=-1;c=getchar();} while(c>='0'&&c<='9'){x=x*10+c-'0';c=getchar();} return x*f;}int n,m,k,c[N],ans;struct edge{ int v,w,ne;}e[M<<1];int h[N],cnt=0;inline void ins(int u,int v){ cnt++; e[cnt].v=v;e[cnt].ne=h[u];h[u]=cnt; cnt++; e[cnt].v=u;e[cnt].ne=h[v];h[v]=cnt;}int vis[N],size;map
mp;map
::iterator it;void dfs(int u){ mp[c[u]]++;vis[u]=1;size++; for(int i=h[u];i;i=e[i].ne){ int v=e[i].v; if(vis[v]) continue; dfs(v); }}int main(){ n=read();m=read();k=read(); for(int i=1;i<=n;i++) c[i]=read(); for(int i=1;i<=m;i++) ins(read(),read()); for(int i=1;i<=n;i++) if(!vis[i]){ size=0;mp.clear(); dfs(i); int t=0; for(it=mp.begin();it!=mp.end();it++) t=max(t,it->second); ans+=size-t; } printf("%d",ans);}
//扔数组 78ms #include 
#include
#include
#include
using namespace std;const int N=2e5+5,M=2e5+5,INF=1e9+5;inline int read(){ char c=getchar();int x=0,f=1; while(c<'0'||c>'9'){
if(c=='-')f=-1;c=getchar();} while(c>='0'&&c<='9'){x=x*10+c-'0';c=getchar();} return x*f;}int n,m,k,c[N],ans;struct edge{ int v,w,ne;}e[M<<1];int h[N],cnt=0;inline void ins(int u,int v){ cnt++; e[cnt].v=v;e[cnt].ne=h[u];h[u]=cnt; cnt++; e[cnt].v=u;e[cnt].ne=h[v];h[v]=cnt;}int vis[N],size;int a[N],p;void dfs(int u){ a[++p]=c[u];vis[u]=1;size++; for(int i=h[u];i;i=e[i].ne){ int v=e[i].v; if(vis[v]) continue; dfs(v); }}int main(){ n=read();m=read();k=read(); for(int i=1;i<=n;i++) c[i]=read(); for(int i=1;i<=m;i++) ins(read(),read()); for(int i=1;i<=n;i++) if(!vis[i]){ size=0; p=0; dfs(i); sort(a+1,a+1+p); int len=1,mx=0; for(int i=1;i<=p;i++){ if(a[i]==a[i+1]) len++; else mx=max(mx,len),len=1; a[i]=0; } ans+=size-mx; } printf("%d",ans);}

 

 

 

转载地址:http://eafsl.baihongyu.com/

你可能感兴趣的文章
解决虚拟机中使用ntpdate报错:ntpdate[46700]: no server suitab
查看>>
Docker 快速删除所有容器
查看>>
【OCP认证12c题库】CUUG 071题库考试原题及答案(27)
查看>>
OSS支持IPV6/IPV4双栈访问域名
查看>>
阿里云应用实时监控 ARMS 再升级,支持 Prometheus 开源生态
查看>>
最全面的IGMP协议总结!
查看>>
你还在 Select * 吗?
查看>>
机器学习能革了数据库索引的命吗?
查看>>
把PDF转成PPT的免费工具
查看>>
多线程 NSCondition线程同步(消费者等待工厂制作完成,工厂发消息)
查看>>
python 冒泡排序加入判断
查看>>
WEB+NFS+DNS的搭建
查看>>
SQL Server2008导出数据生成文件
查看>>
Symfony2出现加载WEB调试工具栏错误
查看>>
shell 信号捕捉处理
查看>>
基于虚拟主机的FTP配置
查看>>
分享一个iptables防火墙的脚本和防御ddos***的脚本
查看>>
服务器生成文件后,客户端直接响应下载
查看>>
域控之间角色转换(BDC转换为PDC)
查看>>
passwd修改用户密码
查看>>