string(7723) "{"docs":[{"id":"158579","text":"\u3010Python\u3011Tkinter\u56fe\u5f62\u754c\u9762\u8bbe\u8ba1\uff08GUI\uff09","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n color: [\r\n ","username":"HGNET","tagsname":"","tagsid":"","catesname":"","catesid":"","createtime":"1641183196","_id":"158579"},{"id":"158620","text":"python\u4e4bgui-tkinter\u53ef\u89c6\u5316\u7f16\u8f91\u754c\u9762 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chart.setOption({ color: [ " ["username"]=> string(5) "HGNET" ["tagsname"]=> string(0) "" ["tagsid"]=> string(0) "" ["catesname"]=> string(0) "" ["catesid"]=> string(0) "" ["createtime"]=> string(10) "1641183196" ["_id"]=> string(6) "158579" } [1]=> array(10) { ["id"]=> string(6) "158620" ["text"]=> string(60) "python之gui-tkinter可视化编辑界面 自动生成代码" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(7) "darkspr" ["tagsname"]=> string(0) "" ["tagsid"]=> string(0) "" ["catesname"]=> string(0) "" ["catesid"]=> string(0) "" ["createtime"]=> string(10) "1641183190" ["_id"]=> string(6) "158620" } [2]=> array(10) { ["id"]=> string(6) "158603" ["text"]=> string(66) "python3.6 +tkinter GUI编程 实现界面化的文本处理工具" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(10) 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string(6) "238890" ["text"]=> string(41) "2021 最新量化投资交易资源汇总" ["intro"]=> string(288) "目录 ECharts 异步加载 ECharts 数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。 chart.setOption({ color: [ " ["username"]=> string(7) "xgqfrms" ["tagsname"]=> string(0) "" ["tagsid"]=> string(0) "" ["catesname"]=> string(0) "" ["catesid"]=> string(0) "" ["createtime"]=> string(10) "1641183063" ["_id"]=> string(6) "238890" } } ["count"]=> int(535118) } 树形dp① - 爱码网
AidenPearce

树形dp大概是在树上的dp,可以有一些父亲节点和儿子节点的关系来dp

一道经典例题:

没有上司的舞会
Ural 大学有 N 个职员,编号为 1-N。他们有从属关系,也就是说他们
的关系就像一棵以校长为根的树,父结点就是子结点的直接上司。每
个职员有一个快乐指数。现在有个周年庆宴会,要求与会职员的快乐
指数最大。但是,没有职员愿和直接上司一起与会。
tyvj1052

简单来讲就是某个职员的直接上司参加,这些职员都不会参加,发现上司和职员的关系像一颗树,可以先思考方程

                                                    少女祈祷中......

dp[i][1/0]表示i节点这个人来或不来时所能达到的最大欢乐指数;则max(dp[root][0/1])就是答案;

则可以写出方程

dp[i][1]+=max(dp[son[i]][0]),

dp[i][0]+=max(dp[son[i][1],dp[son[i]][0]);

则代码如下

#include <cstdio>
#include <algorithm>

using namespace std;

int n;
int ri[6010],root;
int f[6010][2];
struct data
{
    int v,nxt;
}edge[6010];
int cnt,alist[6010];
void add(int u,int v)        //邻接表存图
{
    edge[++cnt].v=v;
    edge[cnt].nxt=alist[u];
    alist[u]=cnt;
}
int poi[6010];
void dp(int x)
{
    f[x][0]=0;
    f[x][1]=ri[x];      //如果x来了,欢乐指数加x自己的
    int nxt=alist[x];
    while(nxt)        //遍历儿子
    {
        int son=edge[nxt].v;
        dp(son);
        f[x][0]+=max(f[son][0],f[son][1]);    //刚才的方程
        f[x][1]+=f[son][0];
        nxt=edge[nxt].nxt;
    }
}
int main()
{
   // freopen("in","r",stdin);
    scanf("%d",&n);
    for(int i=1;i<=n;++i)
    {
        scanf("%d",&ri[i]);
    }
    for(int i=1;i<n;++i)
    {
        int u,v;
        scanf("%d%d",&u,&v);      //存图
        add(v,u);
        poi[u]=1;
    }
    for(int i=1;i<=n;++i)         //找到根节点
    {
        if(poi[i]==0)
        {
            root=i;
            break;
        }
    }
    dp(root);
    printf("%d",max(f[root][0],f[root][1]));
}

然后看一道稍微变式题

luogu p2014选课

题目描述

在大学里每个学生,为了达到一定的学分,必须从很多课程里选择一些课程来学习,在课程里有些课程必须在某些课程之前学习,如高等数学总是在其它课程之前学习。现在有N门功课,每门课有个学分,每门课有一门或没有直接先修课(若课程a是课程b的先修课即只有学完了课程a,才能学习课程b)。一个学生要从这些课程里选择M门课程学习,问他能获得的最大学分是多少?

输入输出格式

输入格式:

第一行有两个整数N,M用空格隔开。(1<=N<=300,1<=M<=300)

接下来的N行,第I+1行包含两个整数ki和si, ki表示第I门课的直接先修课,si表示第I门课的学分。若ki=0表示没有直接先修课(1<=ki<=N, 1<=si<=20)。

输出格式:

只有一行,选M门课程的最大得分。

dp[i][j]表示第i个点选j个数所获的最大学分,包括自己;

dp[i][j]=max(dp[i][j],dp[i][j-k]+dp[i][k]);            (哈~~~,好困)

看代码吧

#include <cstdio>
#include <algorithm>

using namespace std;

int n,m;
struct data
{
    int v,nxt;
}edge[600];
int cnt,alist[600];
void add(int u,int v)
{
    edge[++cnt].v=v;
    edge[cnt].nxt=alist[u];
    alist[u]=cnt;
}
int val[310];int f[310][310];
void dp(int x)
{
    f[x][1]=val[x];
//    printf("%d\n",nxt);
    for(int i=alist[x];i;i=edge[i].nxt)    //遍历son节点
    {
        int son=edge[i].v;
        dp(son);
        for(int j=m+1;j>=1;--j)          //枚举在x的son中选几个,倒叙很重要
        {
            for(int k=0;k<j;++k)          //枚举在son中选几个
            {
                f[x][j]=max(f[x][j],f[x][j-k]+f[son][k]);
            }
        }
    }
}
int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;++i)
    {
        int v;
        scanf("%d%d",&v,&val[i]);
        add(v,i);
    }
    dp(0);        //因为没根,所以建一个总根
    printf("%d",f[0][m+1]);
}

 

                                    少女犯困中......

                                                00:13:55

 

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