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GESP2025年12月六级编程题1解析

  • 2026-01-17 13:02:56
GESP2025年12月六级编程题1解析

GESP202512月六级编程题1比较有难度超出了考纲范围.题目如下:

给定一棵有 n 结点的有根树 T,结点依次以 1,2,...,n 编号,根结点编号为 1。方便起见,编号为 i 的结点称为结点 i

初始时 T 中的结点均为白色。你需要将中的若干个结点染为黑色,使得所有叶子到根的路径上至少有一个黑色结点

将结点 i 染为黑色需要代价 c_i,你需要在满足以上条件的情况下,最小化染色代价之和

叶子是指 T 中没有子结点的结点。

## 输入格式

第一行,一个正整数 n,表示结点数量。

第二行,n-1 个正整数f_2,f_3,...,f_n,其中 f_i 表示结点 i 的父结点的编号,保证 f_i<i

第三行,个正整数c_1,c_2,...,c_n,其中 c_i 表示将结点 i 染为黑色所需的代价。

## 输出格式

一行,一个整数,表示在满足所有叶子到根的路径上至少有一个黑色结点的前提下,染色代价之和的最小值。

## 输入输出样例 #1

### 输入 #1

4

1 2 3

5 6 2 3

### 输出 #1

2

## 输入输出样例 #2

### 输入 #2

7

1 1 2 2 3 3

64 16 15 4 3 2 1

### 输出 #2

10

## 说明/提示

对于 40% 的测试点,保证2<= n<= 16

对于另外 20% 的测试点,保证f_i=i-1

对于所有测试点,保证 2<= n<= 10^51<= c_i<= 10^9

看一下数据规模,40%的测试点,保证 n<= 16 , 学生们都可以想到暴力但具体怎么学暴力,很多学生写不出来.

另外 20% 的测试点,保证f_i=i-1 , 这个特殊条件,可以模拟一下,就是一条链,见下图:

链的分近乎白送因为1是根节点,链只有一个叶子节点那么这条链上谁被染成黑色都行,那就打擂台找个最小值就可以了,核心代码如下:

cin>>n;

ll ba,minn=LONG_LONG_MAX;

bool cs2=true; //一条链的情况

for(int i=2;i<=n;i++){

cin>>ba;

e[ba].push_back(i);

if(ba!=i-1) cs2=false; //判断是否为链

fa[i]=ba;

havson[ba]=true;

}

for(int i=1;i<=n;i++){

cin>>c[i];

minn=min(minn,c[i]); //整颗树的最小值

if(!havson[i])   leaf.push_back(i); //叶子节点

if(cs2){ //20分 链的情况

cout<<minn;

return 0;

}

轻松20分得到

再说暴力枚举,怎么枚举? n<=16,每个点可以染色也可以不染色,一共2^16= 65536个状态,我们可以枚举每个状态,判断所有的叶子节点到根节点的路径上是否都有染色节点如果都有,就是一种有效状态在所有有效状态中,求染色费用的最小值代码如下融合了链的情况,可以得60.这个确实需要很强的基本功.

#include <bits/stdc++.h> //万能头文件

using namespace std; //使用标准的命名空间

using ll =long long;

const int N=1e5+10;

ll n,c[N],fa[N];//fa[i]表示以i的爸爸

vector<ll> e[N];

vector<ll> leaf; //叶子节点的集合

bool havson[N];

bool isok(int a){

int   col[30]={};

for(int   i=1;i<=n;i++){

if(a&(1<<(i-1)))   col[i]=1;

}

for(ll   s:leaf){ //判断是否所有儿子都至少有1个染色的爸爸

bool   flag=0;

ll   k=s;

while(k!=0){

if(col[k])   {

flag=1;   break;

}

k=fa[k];

}

if(!flag)   return 0;

}

return   1;

}

int main(){ //主函数win+D

cin>>n;

ll   ba,minn=LONG_LONG_MAX;

bool   cs2=true; //一条链的情况

for(int   i=2;i<=n;i++){

cin>>ba;

e[ba].push_back(i);

if(ba!=i-1)   cs2=false; //判断是否为链

fa[i]=ba;

havson[ba]=true;

}

for(int   i=1;i<=n;i++){

cin>>c[i];

minn=min(minn,c[i]);   //整颗树的最小值

if(!havson[i])   leaf.push_back(i); //叶子节点

}

if(cs2){   //20分 链的情况

cout<<minn;

return   0;

}

if(n<20){   //暴力

int   N=1<<n;

ll   min20=LONG_LONG_MAX;

for(int   a=1;a<N;a++){ //枚举所有状态,0不用枚举

ll   sum=0;

if(isok(a)){//判断所有的叶子节点到根节点的路径上是否都有染色节点

for(int   i=1;i<=n;i++){//累加染色节点

if(a&(1<<(i-1)))   sum+=c[i];

}

}

if(sum!=0){   //是有效状态

min20=min(min20,sum);

}

}

cout<<min20;

}

return   0; //函数结束

}

再说100分的解法其实就是一个树上的DP,但树上的DP,六级考纲中根本就没提,这是CSP提高组的内容六级动态规划(DP)部分,只提到一维动态规划和简单的背包问题这个也没地说理去所以只能超前学一些.

GESP六级考纲如下:

这题要用树上的DP思想去考虑就简单了.

f[i]表示以i为根的子树的染色代价之和最小值,则第一种情况i节点染色,子树就不需要染色了,f[i]=c[i];

第二种情况: i节点不染色,需要i的子树自己染色f[i]=sum(f[son]),即所有子树的最小染色代价之和;

两种情况取最小值即可.

核心代码如下:

ll n,c[N],f[N];

vector<ll> e[N];

ll dfs(ll k){

if(f[k]>0)   return f[k];

f[k]=c[k];

ll   sum=0;

for(int   son:e[k]){

sum+=dfs(son);

}

if(sum==0)   return f[k];

else   return min(f[k],sum);

}

int main(){ //主函数win+D

cin>>n;

ll   fa;

for(int   i=2;i<=n;i++){

cin>>fa;

e[fa].push_back(i);

}

for(int   i=1;i<=n;i++) cin>>c[i];

cout<<dfs(1);

return   0; //函数结束

}

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  1. CONNECT:[ UseTime:0.000800s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001235s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000699s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000655s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001154s ]
  6. SELECT * FROM `set` [ RunTime:0.000418s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001197s ]
  8. SELECT * FROM `article` WHERE `id` = 460536 LIMIT 1 [ RunTime:0.000899s ]
  9. UPDATE `article` SET `lasttime` = 1770564156 WHERE `id` = 460536 [ RunTime:0.006681s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007406s ]
  11. SELECT * FROM `article` WHERE `id` < 460536 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001189s ]
  12. SELECT * FROM `article` WHERE `id` > 460536 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007945s ]
  13. SELECT * FROM `article` WHERE `id` < 460536 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011377s ]
  14. SELECT * FROM `article` WHERE `id` < 460536 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008205s ]
  15. SELECT * FROM `article` WHERE `id` < 460536 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002494s ]
0.198615s