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Submission #1039397

# Submission time Handle Problem Language Result Execution time Memory
1039397 2024-07-30T20:00:22 Z ZeroCool Spring cleaning (CEOI20_cleaning) C++14
100 / 100
 200 ms 40016 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ar array
#define ld long double
 
const int N = 2e5 + 20;
const int INF = 1e16;
const int MOD = 1e9 + 7;
const ld EPS = 1e-9;
 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,bmi,bmi2,lzcnt,popcnt")

int n, A[N], in[N], dep[N], par[N], top[N], sz[N], T;
vector<int> g[N];

namespace SGT{
	int s[4 * N], lz[4 * N];
	void push(int k,int tl, int tr){
		if(!lz[k])return;
		s[k] = tr - tl + 1 - s[k];	
		if(tl != tr){
			lz[k * 2] ^= lz[k];
			lz[k * 2 + 1] ^= lz[k];
		}
		lz[k] = 0;
	}
	void upd(int k,int tl,int tr,int l,int r){
		push(k, tl, tr);
		if(tl >r || l > tr)return;
		if(l <= tl && tr <= r){
			lz[k] ^= 1;
			push(k, tl, tr);
			return;
		}
		int tm = (tl + tr) / 2;
		upd(k * 2, tl, tm, l,r );
		upd(k *2 + 1, tm + 1, tr, l, r);
		s[k] = s[k * 2] + s[k * 2 + 1];
	}
	
	int get(){
		push(1, 1, n);
		return n - s[1];
	}
}

void dfs1(int x,int p){
	vector<int> v;
	sz[x] = 1;
	par[x] = p;
	for(auto u: g[x]){
		if(u == p)continue;
		v.push_back(u);
		dep[u] = dep[x] + 1;
		dfs1(u, x);
		sz[x] += sz[u];
	}
	g[x] = v;
	for(int i = 1;i < g[x].size();i++){
		if(sz[g[x][i]] > sz[g[x][0]])swap(g[x][0], g[x][i]);
	}
}

void dfs2(int x,bool t){
	if(!t)top[x] = top[par[x]];
	else top[x] = x;
	in[x] = ++T;
	int p = 0;
	for(auto u: g[x])dfs2(u, p++);
}

void upd(int u,int v){
	while(top[u] != top[v]){
		if(dep[top[u]] < dep[top[v]])swap(u, v);
		SGT::upd(1, 1, n, in[top[u]], in[u]);
		u = par[top[u]];
	}
	if(dep[u] > dep[v])swap(u, v);
	SGT::upd(1, 1, n, in[u], in[v]);
}

signed main(){ios_base::sync_with_stdio(false);cin.tie(0);
	int q;
	cin>>n>>q;
	for(int i = 1;i < n;i++){
		int u, v;
		cin>>u>>v;
		--u, --v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	int r = 0;
	for(int i = 0;i < n;i++){
		if(g[i].size() >= 2){
			r = i;
			break;
		}
	}
	dfs1(r, r);
	dfs2(r, 1);
	int cnt = 0;
	for(int i = 0;i  <n;i++){
		if(g[i].empty())upd(i, r), cnt++;
	}
	//cout<<cnt<<'\n';
	while(q--){
		int k;
		cin>>k;
		set<int> s;
		for(int i = 0;i < k;i++){
			int u;
			cin>>u;
			--u;
			s.insert(u);
			A[u] ^= 1;
		}
		int nc = cnt;
		for(auto u: s){
			if(g[u].empty())--nc;
		}
		if((nc + k) % 2){
			cout<<-1<<'\n';;
			for(auto u: s)A[u] = 0;
			continue;
		}
		for(auto u: s){
			if(g[u].empty() != A[u])upd(u, r);
		}
		cout<<n + k + SGT::get() - 2<<'\n';
		for(auto u: s){
			if(g[u].empty() != A[u])upd(u, r);
		}
		for(auto u: s)A[u] = 0;
	}
}

Compilation message

cleaning.cpp: In function 'void dfs1(long long int, long long int)':
cleaning.cpp:62:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |  for(int i = 1;i < g[x].size();i++){
      |                ~~^~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10584 KB Output is correct
2 Correct 84 ms 17232 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 11100 KB Output is correct
2 Correct 11 ms 11352 KB Output is correct
3 Correct 51 ms 23244 KB Output is correct
4 Correct 74 ms 23576 KB Output is correct
5 Correct 99 ms 26172 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 13916 KB Output is correct
2 Correct 13 ms 14356 KB Output is correct
3 Correct 41 ms 40016 KB Output is correct
4 Correct 77 ms 38424 KB Output is correct
5 Correct 36 ms 35108 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 16220 KB Output is correct
2 Correct 37 ms 16984 KB Output is correct
3 Correct 14 ms 14940 KB Output is correct
4 Correct 11 ms 16220 KB Output is correct
5 Correct 14 ms 16728 KB Output is correct
6 Correct 43 ms 16472 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 19000 KB Output is correct
2 Correct 193 ms 20052 KB Output is correct
3 Correct 135 ms 16464 KB Output is correct
4 Correct 194 ms 20048 KB Output is correct
5 Correct 180 ms 20072 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 20932 KB Output is correct
2 Correct 83 ms 31056 KB Output is correct
3 Correct 108 ms 30700 KB Output is correct
4 Correct 74 ms 29528 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10584 KB Output is correct
2 Correct 84 ms 17232 KB Output is correct
3 Correct 12 ms 11100 KB Output is correct
4 Correct 11 ms 11352 KB Output is correct
5 Correct 51 ms 23244 KB Output is correct
6 Correct 74 ms 23576 KB Output is correct
7 Correct 99 ms 26172 KB Output is correct
8 Correct 13 ms 13916 KB Output is correct
9 Correct 13 ms 14356 KB Output is correct
10 Correct 41 ms 40016 KB Output is correct
11 Correct 77 ms 38424 KB Output is correct
12 Correct 36 ms 35108 KB Output is correct
13 Correct 44 ms 16220 KB Output is correct
14 Correct 37 ms 16984 KB Output is correct
15 Correct 14 ms 14940 KB Output is correct
16 Correct 11 ms 16220 KB Output is correct
17 Correct 14 ms 16728 KB Output is correct
18 Correct 43 ms 16472 KB Output is correct
19 Correct 76 ms 19000 KB Output is correct
20 Correct 193 ms 20052 KB Output is correct
21 Correct 135 ms 16464 KB Output is correct
22 Correct 194 ms 20048 KB Output is correct
23 Correct 180 ms 20072 KB Output is correct
24 Correct 163 ms 20932 KB Output is correct
25 Correct 83 ms 31056 KB Output is correct
26 Correct 108 ms 30700 KB Output is correct
27 Correct 74 ms 29528 KB Output is correct
28 Correct 125 ms 19284 KB Output is correct
29 Correct 96 ms 31312 KB Output is correct
30 Correct 75 ms 26180 KB Output is correct
31 Correct 74 ms 38228 KB Output is correct
32 Correct 200 ms 20096 KB Output is correct
33 Correct 119 ms 27984 KB Output is correct
34 Correct 123 ms 30800 KB Output is correct
35 Correct 136 ms 30804 KB Output is correct