BZOJ3572/Luogu3233 [Hnoi2014]世界树 (虚树) (Unfinished)

我太弱了，这叼题先搁着把，来日方长，自有切时。。。

。。。或许吧

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#define R(a,b,c) for(register int  a = (b); a <= (c); ++ a)
#define nR(a,b,c) for(register int  a = (b); a >= (c); -- a)
#define Max(a,b) ((a) > (b) ? (a) : (b))
#define Min(a,b) ((a) < (b) ? (a) : (b))
#define Fill(a,b) memset(a, b, sizeof(a))
#define Swap(a,b) a^=b^=a^=b
#define ll long long
#define ON_DEBUG

#ifdef ON_DEBUG

#define D_e_Line printf("

----------

")
#define D_e(x)  cout << #x << " = " << x << endl
#define Pause() system("pause")

#else

#define D_e_Line ;

#endif

struct ios{
    template<typename ATP>ios& operator >> (ATP &x){
        x = 0; int f = 1; char c;
        for(c = getchar(); c < '0' || c > '9'; c = getchar()) if(c == '-')  f = -1;
        while(c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c = getchar();
        x*= f;
        return *this;
    }
}io;
using namespace std;
#include <vector>

const int N = 300007;

int n;
int ans[N];

struct Edge{
	int nxt, pre, w;
}e[N << 1];
int head[N], cntEdge;
inline void add(int u, int v, int w){
	e[++cntEdge] = (Edge){head[u], v, w}, head[u] = cntEdge;
}

vector<int> G[N];

int dis[N];

int fa[N], son[N], dep[N], siz[N];
inline void DFS_First(int u, int father){
	fa[u] = father, dep[u] = dep[father] + 1, siz[u] = 1;
	for(register int i = head[u]; i; i = e[i].nxt){
		int v = e[i].pre;
		if(v == father) continue;
		dis[v] = dis[u] + e[i].w;
		DFS_First(v, u);
		siz[u] += siz[v];
		if(!son[u] || siz[v] > siz[son[u]]){
			son[u] = v;
		}
	}
}
int dfn[N], dfnIdx, top[N];
inline void DFS_Second(int u, int ancester){
	top[u] = ancester, dfn[u] = ++dfnIdx;
	if(!son[u]) return;
	DFS_Second(son[u], ancester);
	for(register int i = head[u]; i; i = e[i].nxt){
		int v = e[i].pre;
		if(v != son[u] && v != fa[u]){
			DFS_Second(v, v);
		}
	}
}
inline int LCA(int x, int y){
	while(top[x] != top[y]){
		if(dep[fa[top[x]]] < dep[top[y]]) Swap(x, y);
		x = fa[top[x]];
	}
	return dep[x] < dep[y] ? x : y;
}

int sta[N], _top;
inline void Insert(int x){
	if(_top < 2){
		sta[++_top] = x;
		return;
	}
	int lca = LCA(x, sta[_top]);
	if(lca == sta[_top]){
		sta[++_top] = x;
		return;
	}
	while(_top > 1 && dfn[sta[_top-1]] >= dfn[lca]){
		G[sta[_top - 1]].push_back(sta[_top]);
		-- _top;
	}
	if(lca != sta[_top]){
		G[lca].push_back(sta[_top]);
		sta[_top] = lca;
	}
	sta[++_top] = x;
}

inline void DFS(){
	
}

int a[N];
inline bool cmp(const int &a, const int &b){
	return dfn[a] < dfn[b];
}
int main(){
	io >> n;
	R(i,2,n){
		int u, v;
		io >> u >> v;
		add(u, v, 1);
		add(v, u, 1);
	}
	
	DFS_First(1, 0);
	DFS_Second(1, 1);
	
	int Tasks;
	io >> Tasks;
	while(Tasks--){
		int m;
		io >> m;
		R(i,1,m){
			io >> a[i];
		}
		sort(a + 1, a + m + 1, cmp);
		
		R(i,1,m) Insert(a[i]);
		while(_top > 1){
			G[sta[_top - 1]].push_back(sta[_top]);
			-- _top;
		}
		
		DFS(1);
		
		R(i,1,m){
			printf("%d ", ans[i]);
		}
		putchar('
');
		
	}
	
	return 0;
}