제출 #969935

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
969935		shadow_sami	Spring cleaning (CEOI20_cleaning)	C++17	0 / 100	1014 ms	18676 KiB

cleaning

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<ll,ll> pi;
typedef vector<ll> vi;
#define ff first
#define ss second
#define fip(a,b) for(ll i = a ; i<b;i++)
#define fjp(a,b) for(ll j = a ; j<b;j++)
#define fp(k,a,b) for(ll k = a ; k<b;k++)
#define fin(a,b) for(ll i = a;i>=b;i--)
#define fjn(a,b) for(ll j = a;j>=b;j--)
#define fn(k,a,b) for(ll k = a;k>=b;k--)
#define fx(k) for(auto x : k)
#define ordered_set <ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
#define totalone(x) _builtin_popcountll(x)
#define frontzero(x) _builtin_clzll(x)
#define backzero(x) _builtin_ctzll(x)
#define nli "\n";

#ifndef ONLINE_JUDGE
	#define debug(x) cerr<<#x<<" ";printn(x);cerr<<nli;
#else
	#define debug(x)
#endif

void printn(ll x){cerr<<x<<" ";};
void printn(int x){cerr<<x<<" ";};
void printn(double x){cerr<<x<<" ";};
void printn(bool x){cerr<<x<<" ";};
void printn(char x){cerr<<x<<" ";};
void printn(string x){cerr<<x<<" ";};
template<class T> void printn(set<T> s);
template<class T> void printn(vector<T> s);
template<class T,class V> void printn(pair<T, V> s);
template<class T,class V> void printn(map<T, V> s);
template<class T> void printn(set<T> s){cerr<<"{ ";fx(s){printn(x);cerr<<",";};cerr<<"}";}
template<class T> void printn(vector<T> s){cerr<<"[ ";fx(s){printn(x);cerr<<",";};cerr<<"]";}
// template<class T> void printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T,class V> void print(pair<T,V> s){cerr<<"( ";print(s.ff);cerr<<",";print(s.ss);cerr<<")";}
template<class T,class V> void print(map<T,V> s){cerr<<"[ ";fx(s){print(x);cerr<<",";};cerr<<"]";}

const ll mx = 1e5 + 5;
const ll mod = 1e9 + 7;

ll n,m,sum,ans,res,cnt,tp,tp2,tptp;
ll sr,de;
ll tnc[mx];
vi adj[mx];
vi adj2[mx];
bool mark[mx];

ll dfs(ll u,ll par){
	ll pt = 0;

	fx(adj[u])
		if(x!=par){
			pt += dfs(x,u);
		}
	fx(adj2[u])
		if(x!=par){
			pt += dfs(x,u);
		}
	if(par!=-1 && (ll)adj[u].size()+(ll)adj2[u].size()==1)
		pt = 1;
	if(!(pt&1))
		mark[u] = 1,cnt++;	
	return pt;
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
		// freopen("input1.txt","r",stdin);
		// freopen("output1.txt","w",stdout);
		// freopen("error1.txt","w",stderr);

		cin>>n>>m;
		fip(0,n-1){
			cin>>sr>>de;
			adj[sr].push_back(de);
			adj[de].push_back(sr);
		}
		ans = 0;
		res = n+1;
		fip(0,m){
			cin>>tp;
			vi a(tp);
			for(auto &x: a)
				cin>>x;
			fx(a){
				adj2[x].push_back(res);
				adj2[res].push_back(x);
				res++;
			}
			ans = 0;
			cnt = 0;
			tp = -1;
			fip(1,res+1)
				mark[i] = 0;				
			fip(1,n+1)
				if(((ll)adj[i].size()+adj2[i].size())>1){
					tp = i;
					break;
				}
			dfs(tp,-1);
			ans = (mark[tp] ? n + tp + cnt - 2 : -1);
			cout<<ans<<nli;
			fip(1,res+1)
				adj2[i].clear();			
		}

	cerr<<"time elapsed: "<<setprecision(6)<<1000.0*clock()/CLOCKS_PER_SEC<<"ms"<<nli;
	return 0;
}

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