oj.uz

Submission #878804

# Submission time Handle Problem Language Result Execution time Memory
878804 2023-11-25T08:52:39 Z phoenix0423 Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 144 ms 40272 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
// #define int long long
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define REP1(i, n) FOR(i, 0, n + 1)
#define ALL(x) (x).begin(), (x).end()
#define pb push_back
#define pf push_front
#define eb emplace_back
#define f first
#define s second
#define lowbit(x) x&-x
#define ckmin(a, b) a = min(a, b)
#define ckmax(a, b) a = max(a, b)
const int N = 1e9 + 7;
const int INF = 1e9 + 7;
const int maxn = 1e5 + 5;
vector<int> adj[maxn];
int dep[maxn], par[maxn], head[maxn], siz[maxn], loc[maxn], id[maxn], dfn = 0;
int leaf[maxn], isleaf[maxn], used[maxn];
int n, q, rt, lfcnt = 0;
int ans = 0;

void dfs(int pos, int prev){
	if(prev != -1) adj[pos].erase(find(adj[pos].begin(), adj[pos].end(), prev));
	siz[pos] = 1;
	for(auto &x : adj[pos]){
		par[x] = pos;
		dep[x] = dep[pos] + 1;
		dfs(x, pos);
		siz[pos] += siz[x];
		leaf[pos] += leaf[x];	
		if(siz[x] > siz[adj[pos][0]]) swap(x, adj[pos][0]);
	}
	if(!adj[pos].size()) isleaf[pos] = leaf[pos] = 1, lfcnt++;
}

void decompose(int pos, int h){
	id[dfn] = pos, loc[pos] = dfn++;
	head[pos] = h;
	for(auto x : adj[pos]){
		if(x == adj[pos][0]) decompose(x, h);
		else decompose(x, x);
	}
}

int st[maxn * 4], tag[maxn * 4];
void build(int v = 1, int l = 0, int r = n - 1){
	if(l == r){
		st[v] = 1 + (leaf[id[l]] - 1) % 2;
		return;
	}
	int m = (l + r) / 2;
	build(v * 2, l, m);
	build(v * 2 + 1, m + 1, r);
	st[v] = st[v * 2] + st[v * 2 + 1];
}
void flip(int v, int l, int r){
	tag[v] ^= 1;
	st[v] = 3 * (r - l + 1) - st[v];
}
void push(int v, int l, int r){
	if(tag[v]){
		int m = (l + r) / 2;
		flip(v * 2, l, m);
		flip(v * 2 + 1, m + 1, r);
		tag[v] = 0;
	}
}
void apply(int l, int r, int v = 1, int L = 0, int R = n - 1){
	if(l > R || r < L) return;
	if(l <= L && r >= R){
		flip(v, L, R);
		return;
	}
	push(v, L, R);
	int m = (L + R) / 2;
	apply(l, r, v * 2, L, m);
	apply(l, r, v * 2 + 1, m + 1, R);
	st[v] = st[v * 2] + st[v * 2 + 1];
}
void op(int pos){
	while(true){
		apply(loc[head[pos]], loc[pos]);
		if(head[pos] == rt) break;
		pos = par[head[pos]];
	}
}
void init(){
	dfs(rt, -1);
	decompose(rt, rt);
	build();
}

int main(void){
	fastio;
	cin>>n>>q;
	for(int i = 0; i < n - 1; i++){
		int a, b;
		cin>>a>>b;
		a--, b--;
		adj[a].pb(b);
		adj[b].pb(a);
	}
	for(int i = 0; i < n; i++){
		if(adj[i].size() > 1){
			rt = i;
			par[i] = i;
			break;
		}
	}	
	init();
	while(q--){
		int d;
		cin>>d;
		vector<int> a(d);
		for(int i = 0; i < d; i++){
			cin>>a[i];
			a[i] --;
			if(isleaf[a[i]] && !used[a[i]]) used[a[i]] = i + 1, lfcnt--;
			else op(a[i]);
		}
		if((lfcnt + d) % 2) cout<<-1<<"\n";
		else cout<<st[1] + d - 2<<"\n";
		for(int i = 0; i < d; i++){
			if(isleaf[a[i]] && used[a[i]] == i + 1) used[a[i]] = 0, lfcnt++;
			else op(a[i]);
		}
	}
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 9048 KB Output is correct
2 Correct 68 ms 10072 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 9560 KB Output is correct
2 Correct 39 ms 9564 KB Output is correct
3 Correct 23 ms 12756 KB Output is correct
4 Correct 45 ms 11984 KB Output is correct
5 Correct 46 ms 13008 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 11352 KB Output is correct
2 Correct 32 ms 11096 KB Output is correct
3 Correct 52 ms 40272 KB Output is correct
4 Correct 94 ms 37968 KB Output is correct
5 Correct 47 ms 37456 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 13072 KB Output is correct
2 Correct 26 ms 10332 KB Output is correct
3 Correct 7 ms 10516 KB Output is correct
4 Correct 9 ms 12124 KB Output is correct
5 Correct 12 ms 12892 KB Output is correct
6 Correct 40 ms 12436 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 11488 KB Output is correct
2 Correct 143 ms 11600 KB Output is correct
3 Correct 115 ms 10460 KB Output is correct
4 Correct 144 ms 11716 KB Output is correct
5 Correct 138 ms 11488 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 120 ms 13028 KB Output is correct
2 Correct 85 ms 23572 KB Output is correct
3 Correct 108 ms 25112 KB Output is correct
4 Correct 113 ms 23336 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 9048 KB Output is correct
2 Correct 68 ms 10072 KB Output is correct
3 Correct 38 ms 9560 KB Output is correct
4 Correct 39 ms 9564 KB Output is correct
5 Correct 23 ms 12756 KB Output is correct
6 Correct 45 ms 11984 KB Output is correct
7 Correct 46 ms 13008 KB Output is correct
8 Correct 32 ms 11352 KB Output is correct
9 Correct 32 ms 11096 KB Output is correct
10 Correct 52 ms 40272 KB Output is correct
11 Correct 94 ms 37968 KB Output is correct
12 Correct 47 ms 37456 KB Output is correct
13 Correct 60 ms 13072 KB Output is correct
14 Correct 26 ms 10332 KB Output is correct
15 Correct 7 ms 10516 KB Output is correct
16 Correct 9 ms 12124 KB Output is correct
17 Correct 12 ms 12892 KB Output is correct
18 Correct 40 ms 12436 KB Output is correct
19 Correct 89 ms 11488 KB Output is correct
20 Correct 143 ms 11600 KB Output is correct
21 Correct 115 ms 10460 KB Output is correct
22 Correct 144 ms 11716 KB Output is correct
23 Correct 138 ms 11488 KB Output is correct
24 Correct 120 ms 13028 KB Output is correct
25 Correct 85 ms 23572 KB Output is correct
26 Correct 108 ms 25112 KB Output is correct
27 Correct 113 ms 23336 KB Output is correct
28 Correct 95 ms 12536 KB Output is correct
29 Correct 96 ms 25944 KB Output is correct
30 Correct 61 ms 14540 KB Output is correct
31 Correct 88 ms 39496 KB Output is correct
32 Correct 143 ms 12720 KB Output is correct
33 Correct 94 ms 22356 KB Output is correct
34 Correct 122 ms 25696 KB Output is correct
35 Correct 114 ms 25376 KB Output is correct