Shorten Diameter


Time limit : 2sec / Stack limit : 256MB / Memory limit : 256MB

Score : 600 points

Problem Statement

Given an undirected tree, let the distance between vertices u and v be the number of edges on the simple path from u to v. The diameter of a tree is the maximum among the distances between any two vertices. We will call a tree good if and only if its diameter is at most K.

You are given an undirected tree with N vertices numbered 1 through N. For each i(1≦iN−1), there is an edge connecting vertices Ai and Bi.

You want to remove zero or more vertices from the tree, so that the resulting tree is good. When a vertex is removed, all incident edges will also be removed. The resulting graph must be connected.

Find the minimum number of vertices that you need to remove in order to produce a good tree.

Constraints

  • 2≦N≦2000
  • 1≦KN−1
  • 1≦AiN,1≦BiN
  • The graph defined by Ai and Bi is a tree.

Input

The input is given from Standard Input in the following format:

N K
A1 B1
A2 B2
:
AN−1 BN−1

Output

Print the minimum number of vertices that you need to remove in order to produce a good tree.


Sample Input 1

6 2
1 2
3 2
4 2
1 6
5 6

Sample Output 1

2

The tree is shown below. Removing vertices 5 and 6 will result in a good tree with the diameter of 2.


Sample Input 2

6 5
1 2
3 2
4 2
1 6
5 6

Sample Output 2

0

Since the given tree is already good, you do not need to remove any vertex.

分析:虽然没做出来,不过看了陈高远大牛的代码还是可以yy一下的。

可以先求出任意两点间的距离(dfs),然后考虑最优情况是左右子树平衡的时候(有2种情况),遍历至最优情况即可

aaarticlea/png;base64,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" alt="" />aaarticlea/png;base64,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" alt="" />

代码:

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <climits>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <vector>
#include <list>
#include <ext/rope>
#define rep(i,m,n) for(i=m;i<=n;i++)
#define rsp(it,s) for(set<int>::iterator it=s.begin();it!=s.end();it++)
#define vi vector<int>
#define pii pair<int,int>
#define mod 1000000007
#define inf 0x3f3f3f3f
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ll long long
#define pi acos(-1.0)
const int maxn=2e3+;
const int dis[][]={{,},{-,},{,-},{,}};
using namespace std;
using namespace __gnu_cxx;
ll gcd(ll p,ll q){return q==?p:gcd(q,p%q);}
ll qpow(ll p,ll q){ll f=;while(q){if(q&)f=f*p;p=p*p;q>>=;}return f;}
int n,m,a[maxn][maxn],mi,cnt;
vi p[maxn];
pii q[maxn];
void dfs(int root,int pre,int now,int s)
{
a[root][now]=s;
for(int x:p[now])
{
if(x!=pre)dfs(root,now,x,s+);
}
}
int main()
{
int i,j,k,t;
mi=inf;
scanf("%d%d",&n,&k);
rep(i,,n-){
scanf("%d%d",&j,&t);
p[j].pb(t),p[t].pb(j);
q[i].fi=j,q[i].se=t;
}
rep(i,,n)dfs(i,-,i,);
rep(i,,n)
{
cnt=;
rep(j,,n)
if(*a[i][j]>k)cnt++;
mi=min(mi,cnt);
}
rep(i,,n-)
{
cnt=;
rep(j,,n)
if(*min(a[j][q[i].fi],a[j][q[i].se])+>k)
cnt++;
mi=min(mi,cnt);
}
printf("%d\n",mi);
//system ("pause");
return ;
}

Shorten Diameter的更多相关文章

  1. AtCoder Grand Contest 001 C Shorten Diameter 树的直径知识

    链接:http://agc001.contest.atcoder.jp/tasks/agc001_c 题解(官方): We use the following well-known fact abou ...

  2. ACC 001 C - Shorten Diameter 图论

    题目: Problem Statement Given an undirected tree, let the distance between vertices \(u\) and \(v\) be ...

  3. AGC001 C - Shorten Diameter【枚举】

    一开始没看到要保证最后是树--所以一定要从叶子开始删 枚举重心,如果k是偶数,那么按当前重心提起来deep大于k/2的全都要切掉,这样枚举重心然后取min即可 奇数的话就是枚举直径中间的边,然后从两边 ...

  4. AtCoderACGC001C Shorten Diameter

    Description: 给定一个\(n\)个点的树,要求删去最少的点使树的致直径不超过k Solution: 如果\(k\)为偶数,对于最终状态一定是以每一个点为根任何点的深度不能超过\(k/2\) ...

  5. RE:从零开始的AGC被虐(到)生活(不能自理)

    RE:从零开始的AGC被虐(到)生活(不能自理) 「一直注视着你,似近似远,总是触碰不到.」 --来自风平浪静的明天 AtCoder Grand Contest 001 B: Mysterious L ...

  6. AtCoder Grand Contest

    一句话题解 QwQ主要是因为这篇文章写的有点长……有时候要找某一个题可能不是很好找,所以写了这个东西. 具体的题意.题解和代码可以再往下翻._(:з」∠)_ AGC 001 C:枚举中点/中边. D: ...

  7. A*G#C001

    AGC001 A BBQ Easy 贪心. https://agc001.contest.atcoder.jp/submissions/7856034 B Mysterious Light 很nb这个 ...

  8. 【AtCoder】AGC001

    AGC001 A - BBQ Easy 从第\(2n - 1\)个隔一个加一下加到1即可 #include <bits/stdc++.h> #define fi first #define ...

  9. AGC001[BCDE] 题解

    A没意思 F太难 所以大概近期的AGC题解都是BCDE的 然后特殊情况再说 开始刷AGC的原因就是计数太差 没有脑子 好几个学长都推荐的AGC所以就开始刷了 = = 大概两天三篇的速度?[可能也就最开 ...

随机推荐

  1. ubuntu如何实现访问实际网络中windows共享文件夹

    方法一: 首先在建立一个挂载目录. sudo mkdir /mnt/share 然后就把共享目录持载进去. 服务器:192.168.6.84 共享名:gg 用户名:administrator 密 码: ...

  2. lldp中与snmp相关内容agentx

    struct lldpd { int    g_snmp; struct event  *g_snmp_timeout; void   *g_snmp_fds; char   *g_snmp_agen ...

  3. svnserve: E000098: 不能绑定服务器套接字: 地址已在使用

    百度一下,所有资料都是 1.查找出目前正在使用的svnserve进程,然后kill掉 ps -aux | grep svnserve kill -9  xxx    // xxx代表svnserve对 ...

  4. js中的clientWidth offsetWidth scrollWidth等的含义

    网页可见区域宽: document.body.clientWidth;网页可见区域高: document.body.clientHeight;网页可见区域宽: document.body.offset ...

  5. jquery多级下拉菜单

    var menu = new Click('#menu',{target:'p',parent:'li',contr:'ul',way:0}); /* 参数说明: target : 点击事件发生在该元 ...

  6. shell命令一行代码搞定【转】

    查看文件内容-while: cat 1.txt|while read line;do echo $line;done while read line; do echo $line; done < ...

  7. 大varchar,test,blob数据类型的优化

    set global innodb-file-format=Barracuda 其它优化,后续补充

  8. hibernate ——关联关系

    1.一对一单向外键关联 <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC ...

  9. Hibernate 系列教程4-单向多对一

    项目图片 hibernate.cfg.xml <mapping resource="com/jege/hibernate/one/way/manytoone/User.hbm.xml& ...

  10. linux视频学习5(top, 网络监控

    top命令的详解: 1. top :动态监控进程. 第一行:当前系统时间:  up  4days :服务器启动后的持续时间. 5 user 当前服务器上的用户数目 ; load average :负载 ...