树形dp 219D Choosing Capital for Treeland

http://codeforces.com/problemset/problem/219/D

题意:

可以这么理解为—— 一些城市的道路之间是有向边,如果沿着路的方向来走花费的价值为 0,如果逆向行走花费的价值为 1,选择一些点为首都,使其到其他点所花费的价值最小

思路:

树形dp

运用两次深搜,第一次深搜求出点i到以其自身为根节点的子树上其他点总共需要花费的价值,dp[ i ] 记录。

第二次深搜,根据第一次dp的结果,利用父节点的信息来更新子节点,求出点i到整个图中其他任意点所花费的价值,dp[ i ] 记录。

如果root指向son   dp[son] = dp[root] + 1;

如果son指向root   dp[root] = dp[son] + 1;

#include<iostream>
#include<cstdio>
#include<vector>
#include<queue>
#include<cstring>
#include<algorithm>
using namespace std;
const int N =2e5+5;
struct node
{
    int v,w;
};
vector<node> g[N];
bool flag[N];
int dp[N];
queue<int> q;
void dfs(int root)
{
    flag[root] = true;
    int i;
    for(i= 0; i < (int)g[root].size(); i++)
    {
        int son = g[root][i].v;
        if(flag[son]) continue;
        dfs(son);
        if(g[root][i].w == 0)
        {
            dp[root] += dp[son] + 1;
        }
        else
        {
            dp[root] += dp[son];
        }
    }
}
void DFS(int root)
{
    flag[root] = true ;
    int i;
    for(i = 0; i < (int) g[root].size(); i++)
    {
        int son = g[root][i].v;
        if(flag[son]) continue;
        if(g[root][i].w == 0)
        {
            dp[son] = dp[root] - 1; // 反向
        }
        else
        {
            dp[son] = dp[root] + 1; // 正向
        }
        DFS(son);
    }
}
int main()
{
    int n,i,u,v;
    while(~scanf("%d",&n))
    {
        for(i = 1; i <= n; i++)
        {
            flag[i] = false;
            g[i].clear();
            dp[i] = 0;
        }
        node temp;
        for(i = 1; i < n; i++)
        {
            scanf("%d%d",&u,&v);
            temp.v = v;
            temp.w = 1;
            g[u].push_back(temp);
            temp.v = u;
            temp.w = 0;
            g[v].push_back(temp);
        }
        dfs(1);
        memset(flag,false,sizeof(flag));
        DFS(1);
        while(!q.empty())
        {
            q.pop();
        }
        int Min = N;
        for(i = 1; i <= n; i++)
        {
            if(dp[i] < Min)
            {
                Min = dp[i];
                while(!q.empty())
                {
                    q.pop();
                }
                q.push(i);
                continue;
            }
            if(dp[i] == Min)
            {
                q.push(i);
            }
        }
        printf("%d\n",Min);
        printf("%d",q.front());
        q.pop();
        while(!q.empty())
        {
            printf(" %d",q.front());
            q.pop();
        }
        puts("");
    }
    return 0;
}


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deprecated, use 4.3.0.38 Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\docopt-0.6.2.tar.gz Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\future-0.18.2.tar.gz Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\imgaug-0.4.0-py2.py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\matplotlib-3.3.0-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\numpy-1.19.1-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\opencv_python-4.3.0.36-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\pandas-1.1.0-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\pillow-7.2.0-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\psutil-5.7.3-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\scikit_image-0.17.2-cp36-cp36m-win_amd64.whl Saved 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e:\vscodeprojects\hovernet-honernet111\pip_cache\oauthlib-3.2.2-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\rsa-4.9.1-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\setuptools-59.6.0-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\shapely-1.8.5.post1-cp36-cp36m-win_amd64.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\six-1.17.0-py2.py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\tensorboard_plugin_wit-1.8.1-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\threadpoolctl-3.1.0-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\tifffile-2020.9.3-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\typing_extensions-4.1.1-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\urllib3-1.26.20-py2.py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\werkzeug-2.0.3-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\dataclasses-0.8-py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\wheel-0.37.1-py2.py3-none-any.whl Saved e:\vscodeprojects\hovernet-honernet111\pip_cache\zipp-3.6.0-py3-none-any.whl Successfully downloaded docopt future imgaug matplotlib numpy opencv-python pandas pillow psutil scikit-image scikit-learn scipy tensorboard tensorboardx termcolor tqdm absl-py cycler google-auth cachetools google-auth-oauthlib grpcio imageio joblib kiwisolver markdown importlib-metadata networkx decorator protobuf pyasn1-modules pyasn1 pyparsing python-dateutil pytz PyWavelets requests certifi charset-normalizer idna requests-oauthlib oauthlib rsa setuptools Shapely six tensorboard-plugin-wit threadpoolctl tifffile typing-extensions urllib3 werkzeug dataclasses wheel zipp 详细告诉我进程里都发生了什么,为什么会有警告?最终算是成功安装了吗
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08-09
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