Submission #404907

#	Time	Username	Problem	Language	Result	Execution time	Memory
404907		silverfish	Spring cleaning (CEOI20_cleaning)	C++14	34 / 100	1087 ms	21116 KiB

cleaning

#include <bits/stdc++.h>
using namespace std;

/*<DEBUG>*/
#define tem template <typename 
#define can_shift(_X_, ...) enable_if_t<sizeof test<_X_>(0) __VA_ARGS__ 8, debug&> operator<<(T i)
#define _op debug& operator<<
tem C > auto test(C *x) -> decltype(cerr << *x, 0LL);
tem C > char test(...);
tem C > struct itr{C begin, end; };
tem C > itr<C> get_range(C b, C e) { return itr<C>{b, e}; }
struct debug{
#ifdef _LOCAL
	~debug(){ cerr << endl; }
	tem T > can_shift(T, ==){ cerr << boolalpha << i; return *this; }
	tem T> can_shift(T, !=){ return *this << get_range(begin(i), end(i)); }
	tem T, typename U > _op (pair<T, U> i){ 
		return *this << "< " << i.first << " , " << i.second << " >"; }
	tem T> _op (itr<T> i){
		*this <<  "{ ";
		for(auto it = i.begin; it != i.end; it++){
			*this << " , " + (it==i.begin?2:0) << *it;
		}
		return *this << " }";
	}
#else
tem T> _op (const T&) { return *this; }
#endif 
};

tem T>
string _ARR_(T* arr, int sz){
	string ret = "{ " + to_string(arr[0]); 
	for(int i = 1; i < sz; i++) ret += " , " +  to_string(arr[i]);
	ret += " }"; return ret;
}

#define exp(...) " [ " << #__VA_ARGS__ << " : " << (__VA_ARGS__) << " ]"
/*</DEBUG>*/

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int uint;
typedef pair<int, int> pii;
//mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define pb push_back
#define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define TC int __TC__; cin >> __TC__; while(__TC__--)
#define ar array

const int INF = 1e9 + 7, N = 2e5 + 10;

vector<int> adj[N];
int in[N], out[N], add[N];
int ans = 0, n, q, d, cur,fst=0, leafs = 0;

void dfs(int u, int p=fst){
	in[u] = out[u] = 0;
	for(int v : adj[u]){
		if(v != p){
			dfs(v, u);
			in[u] += out[v];
		}
	}


	if(adj[u].size() == 1){
		in[u] = 0;
		out[u] = 1;
		++leafs;
	}else{
		out[u] = (in[u]%2 ? 1 : 2);
	}

	ans += in[u];
	return;
}

int main()
{
	FAST;
	cin >> n >> q;
	for(int i = 0; i < n-1; ++i){
		int u, v; cin >> u >> v;
		--u; --v;
		adj[u].pb(v);
		adj[v].pb(u);
	}

	for(int i = 0; i < n; ++i){
		if(adj[i].size() != 1) fst = i;
	}

	cur = n-1;
	while(q--){
		cin >> d;
		leafs=0;

		for(int i = 0; i < d; ++i){
			cin >> add[i];
			--add[i];
			++cur;
			adj[add[i]].pb(cur);
			adj[cur].pb(add[i]);
		}

		ans = 0;
		dfs(fst);
		cout << (leafs%2 ? -1 : ans) << '\n';

		for(int i = 0; i < d; ++i){
			adj[add[i]].pop_back();
		}

		for(; cur >= n; --cur){
			adj[cur].pop_back();
		}
	}


	return 0;
}

• Subtask 1: 0 / 0
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 16 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 17
• Subtask 7: 0 / 30