題目連結

太神辣，想我這種zz根本想不到

orz yjt

這裡就不寫了（其實是我懶

程式碼：

#include<cstdio>
#include<cmath>
#include<queue>
#include<stack>
#include<vector>
#include<algorithm>
#include<cstring>
using namespace std;

typedef long long LL;

const int maxn = 200010;
const int maxs = 20 * 2 * maxn;

struct data{
	int u,dep,fa;
}stk[maxs];

struct edge{
	int u,v;
}e[maxn];

int n,m,q,top,maxtop,p[maxn][10],c[maxn],ans[maxn];
int fa[maxn],dep[maxn];
int vis[maxn];

inline int getint()
{
	int ret = 0,f = 1;
	char c = getchar();
	while (c < '0' || c > '9')
	{
		if (c == '-') f = -1;
		c = getchar();
	}
	while (c >= '0' && c <= '9')
		ret = ret * 10 + c - '0',c = getchar();
	return ret * f;
}

inline int find(int u)
{
	return fa[u] == u ? u : find(fa[u]);
}

inline void LetBeOne(int u,int v)
{
	if (u == v) return;
	stk[++top] = (data){u,dep[u],fa[u]};
	stk[++top] = (data){v,dep[v],fa[v]}; 
	if (dep[u] < dep[v]) swap(u,v);
	if (dep[u] == dep[v]) dep[u]++;
	fa[v] = u;
}

inline void recover(int now)
{
	while (top != now)
	{
		int u = stk[top].u;
		fa[u] = stk[top].fa;
		dep[u] = stk[top].dep;
		top--;
	}
}

inline void LetBe(int l,int r,int x)
{
	for (int i = l; i <= r; i++)
		for (int j = 1; j <= c[i]; j++)
			vis[p[i][j]] = x;
}

inline void Link(int l,int r)
{
	for (int i = l; i <= r; i++)
		for (int j = 1; j <= c[i]; j++)
			if (!vis[p[i][j]]) 
				LetBeOne(find(e[p[i][j]].u),find(e[p[i][j]].v));
}

inline void solve(int l,int r)
{
	if (l == r)
	{
		for (int i = 1; i <= c[l]; i++)
			if (find(e[p[l][i]].u) != find(e[p[l][i]].v)) {ans[l] = 0; return;}
		ans[l] = 1; return;
	}
	// printf("%d\n",top);
	int mid = l + r >> 1,now = top;

	LetBe(l,mid,1);
	Link(mid + 1,r);
	LetBe(l,mid,0);
	solve(l,mid);
	recover(now);

	LetBe(mid + 1,r,1);
	Link(l,mid);
	LetBe(mid + 1,r,0);
	solve(mid + 1,r);
	recover(now);
}

int main()
{
	#ifdef AMC
		freopen("AMC1.txt","r",stdin);
		freopen("AMC2.txt","w",stdout);
	#endif
	n = getint(); m = getint();
	for (int i = 1; i <= m; i++)
		e[i].u = getint() , e[i].v = getint();

	q = getint();
	
	for (int i = 1; i <= q; i++)
	{
		c[i] = getint();
		for (int j = 1; j <= c[i]; j++)
			p[i][j] = getint();
	}

	for (int i = 1; i <= n; i++) fa[i] = i;

	LetBe(1,q,1);
	for (int i = 1; i <= m; i++)
		if (!vis[i]) LetBeOne(find(e[i].u),find(e[i].v));
	LetBe(1,q,0);
	
	solve(1,q);

	for (int i = 1; i <= q; i++)
		puts(ans[i] ? "Connected" : "Disconnected");
	return 0;
}