uva 10859

刘书例题  树形dp

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <sstream>
#include <string>
#include <cstring>
#include <algorithm>
#include <iostream>
#define maxn 200010
#define INF 0x7fffffff
#define inf 10000000
#define MOD 1000000007
#define ull unsigned long long
#define ll long long
using namespace std;

vector<int> g[1010];

bool vis[1010][2];
int d[1010][2], m, n;

int dp(int i, int j, int fa)
{
    if(vis[i][j]) return d[i][j];
    vis[i][j] = true;
    int& ans = d[i][j];
    ans = 2000;
    for(int k = 0; k < (int)g[i].size(); ++ k)
        if(g[i][k] != fa) ans += dp(g[i][k], 1, i);
    if(!j && fa >= 0) ++ ans;
    if(j || fa < 0)
    {
        int sum = 0;
        for(int k = 0; k < (int)g[i].size(); ++ k)
            if(g[i][k] != fa) sum += dp(g[i][k], 0, i);
        if(fa >= 0) ++ sum;
        ans = min(ans, sum);
    }
    return ans;
}

void init()
{
    for(int i = 0; i < n; ++ i) g[i].clear();
    memset(vis, 0, sizeof(vis));
}

int main()
{
    int t;
    scanf("%d", &t);
    while(t --)
    {
        scanf("%d%d", &n, &m);
        init();
        for(int i = 0; i < m; ++ i)
        {
            int a, b;
            scanf("%d%d", &a, &b);
            g[a].push_back(b);
            g[b].push_back(a);
        }
        int ans = 0;
        for(int i = 0; i < n; ++ i)
            if(!vis[i][0]) ans += dp(i, 0, -1);
        printf("%d %d %d\n", ans/2000, m-ans%2000, ans%2000);
    }
    return 0;
}