답안 #470171

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
470171	2021-09-03T07:28:03 Z	Sohsoh84	Sumtree (INOI20_sumtree)	C++14	50 / 100	716 ms	93548 KB

Main

// orz
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)                      (x).begin(),(x).end()
#define X                           first
#define Y                           second
#define sep                         ' '
#define endl                        '\n'
#define debug(x)                    cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e6 + 10;
const ll MOD = 1e9 + 7;
const ll LOG = 20;

struct Fenwick {
	int fen[MAXN];
	Fenwick() {}

	inline void add(int ind, int val) {
		for (++ind; ind < MAXN; ind += ind & -ind)
			fen[ind] += val;
	}

	inline int query(int ind) {
		int ans = 0;
		for (++ind; ind > 0; ind -= ind & -ind)
			ans += fen[ind];
		return ans;
	}

	inline void add(int l, int r, int val) {
		if (r < l) return;
		add(l, val);
		add(r + 1, -val);
	}


	inline int query(int l, int r) {
		if (r < l) return 0;
		return query(r) - query(l - 1);
	}

	inline void update(int ind, int val) {
		val -= query(ind, ind);
		add(ind, val);
	}
};


inline ll poww(ll a, ll b) {
	ll ans = 1;
	while (b) {
		if (b & 1) ans = ans * a % MOD;
		a = a * a % MOD;
		b >>= 1;
	}

	return ans;
}

inline ll Inv(ll a) {
	return poww(a, MOD - 2);
}

// R == 0 ?

set<int> Z;
int n, r, q, sub_g[MAXN], par[MAXN][LOG],
    tin[MAXN], tout[MAXN], T, H[MAXN], R[MAXN];
ll fact[MAXN], inv[MAXN], F[MAXN], ans = 1;
vector<int> adj[MAXN];
Fenwick s_fen, t_fen, p_fen;

void dfs(int v, int p) {
	sub_g[v] = 1;
	par[v][0] = p;
	H[v] = H[p] + 1;
	tin[v] = ++T;

	for (int u : adj[v])
		if (u != p)
			dfs(u, v), sub_g[v] += sub_g[u];
	tout[v] = T;
}

inline ll C(ll k, ll n) {
	if (k < 0 || k > n) return 0;
	return fact[n] * inv[k] % MOD * inv[n - k] % MOD;
}

inline void update(int ind, ll val) {
	if (F[ind] == 0) Z.erase(ind);
	
	if (val == 0) {
		Z.insert(ind);
		F[ind] = 0;
		return;
	}

	ans = ans * val % MOD * (F[ind] == 0 ? 1 : Inv(F[ind])) % MOD;
	F[ind] = val;
}

inline int Par(int v) {
	int t = p_fen.query(tin[v]);
	for (int i = LOG - 1; i >= 0; i--)
		if (p_fen.query(tin[par[v][i]]) == t)
			v = par[v][i];
	return par[v][0];
}

inline void add(int v, int r) {
	R[v] = r;
	p_fen.add(tin[v] + 1, tout[v], 1);
	r -= t_fen.query(tin[v] + 1, tout[v]);
	t_fen.add(tin[v], r);
	
	int s = sub_g[v] - s_fen.query(tin[v] + 1, tout[v]);
	s_fen.add(tin[v], s);
	
	update(v, C(s - 1, s + r - 1));
}

inline void recalc(int v) {
	int r = R[v];
	r -= t_fen.query(tin[v] + 1, tout[v]);
	t_fen.update(tin[v], r);
	
	int s = sub_g[v] - s_fen.query(tin[v] + 1, tout[v]);
	s_fen.update(tin[v], s);
	
	update(v, C(s - 1, s + r - 1));
}

inline void remove(int v) {
	p_fen.add(tin[v] + 1, tout[v], -1);
	s_fen.update(tin[v], 0);
	t_fen.update(tin[v], 0);
	R[v] = 1;
	update(v, 1);
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	fact[0] = inv[0] = 1;
	for (int i = 1; i < MAXN; i++) 
		fact[i] = fact[i - 1] * i % MOD, inv[i] = Inv(fact[i]);
	fill(F, F + MAXN, 1);

	cin >> n >> r;
	for (int i = 1; i < n; i++) {
		int u, v;
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);	
	}


	dfs(1, 0);
	for (int i = 1; i < LOG; i++)
		for (int v = 1; v <= n; v++)
			par[v][i] = par[par[v][i - 1]][i - 1];
	
	add(1, r);

	cout << (Z.empty() ? ans : 0) << endl;
	cin >> q;
	while (q--) {
		int c;
		cin >> c;
		if (c == 1) {
			int v, u, p;
			cin >> v >> u;
			add(v, u);
			p = Par(v);
			recalc(p);
		} else {
			int v, p;
			cin >> v;
			p = Par(v);
		
			remove(v);
			recalc(p);
		}

		cout << (Z.empty() ? ans : 0) << endl;
	}
	return 0;
}

Subtask #1

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	358 ms	80532 KB	Output is correct
2	Correct	345 ms	80484 KB	Output is correct
3	Correct	354 ms	80572 KB	Output is correct
4	Correct	351 ms	80468 KB	Output is correct
5	Correct	367 ms	76560 KB	Output is correct
6	Correct	181 ms	48060 KB	Output is correct
7	Correct	177 ms	47780 KB	Output is correct
8	Correct	180 ms	47812 KB	Output is correct
9	Correct	348 ms	72976 KB	Output is correct
10	Correct	419 ms	72596 KB	Output is correct
11	Correct	345 ms	72856 KB	Output is correct
12	Correct	345 ms	71444 KB	Output is correct
13	Correct	326 ms	78044 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	176 ms	47524 KB	Output is correct
2	Correct	177 ms	47408 KB	Output is correct
3	Correct	177 ms	47416 KB	Output is correct
4	Correct	174 ms	47388 KB	Output is correct
5	Correct	176 ms	47468 KB	Output is correct
6	Correct	178 ms	47652 KB	Output is correct
7	Correct	181 ms	47716 KB	Output is correct
8	Correct	182 ms	47684 KB	Output is correct
9	Correct	194 ms	47828 KB	Output is correct
10	Correct	183 ms	47936 KB	Output is correct
11	Correct	195 ms	47976 KB	Output is correct
12	Correct	176 ms	47860 KB	Output is correct
13	Correct	179 ms	47868 KB	Output is correct
14	Correct	188 ms	47932 KB	Output is correct
15	Correct	192 ms	48072 KB	Output is correct
16	Correct	184 ms	47840 KB	Output is correct
17	Correct	181 ms	47928 KB	Output is correct
18	Correct	189 ms	47588 KB	Output is correct
19	Correct	180 ms	47828 KB	Output is correct
20	Correct	181 ms	47716 KB	Output is correct
21	Correct	186 ms	47712 KB	Output is correct
22	Correct	174 ms	47428 KB	Output is correct

Subtask #3

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	413 ms	82652 KB	Output is correct
2	Correct	424 ms	83392 KB	Output is correct
3	Correct	360 ms	83652 KB	Output is correct
4	Correct	450 ms	84016 KB	Output is correct
5	Correct	584 ms	80824 KB	Output is correct
6	Correct	179 ms	48100 KB	Output is correct
7	Correct	177 ms	47752 KB	Output is correct
8	Correct	179 ms	47880 KB	Output is correct
9	Correct	536 ms	76996 KB	Output is correct
10	Correct	511 ms	76808 KB	Output is correct
11	Correct	485 ms	76628 KB	Output is correct
12	Correct	567 ms	77252 KB	Output is correct
13	Correct	582 ms	93476 KB	Output is correct
14	Correct	573 ms	93436 KB	Output is correct
15	Correct	582 ms	93380 KB	Output is correct
16	Correct	571 ms	93336 KB	Output is correct
17	Correct	576 ms	93548 KB	Output is correct

Subtask #4

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	693 ms	78132 KB	Output is correct
2	Correct	655 ms	77936 KB	Output is correct
3	Correct	676 ms	78148 KB	Output is correct
4	Correct	670 ms	78116 KB	Output is correct
5	Correct	646 ms	76360 KB	Output is correct
6	Correct	646 ms	77892 KB	Output is correct
7	Correct	525 ms	63720 KB	Output is correct
8	Correct	586 ms	63732 KB	Output is correct
9	Correct	716 ms	77940 KB	Output is correct
10	Correct	655 ms	77952 KB	Output is correct
11	Correct	644 ms	77928 KB	Output is correct
12	Correct	528 ms	63784 KB	Output is correct
13	Incorrect	456 ms	61252 KB	Output isn't correct
14	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	358 ms	80532 KB	Output is correct
2	Correct	345 ms	80484 KB	Output is correct
3	Correct	354 ms	80572 KB	Output is correct
4	Correct	351 ms	80468 KB	Output is correct
5	Correct	367 ms	76560 KB	Output is correct
6	Correct	181 ms	48060 KB	Output is correct
7	Correct	177 ms	47780 KB	Output is correct
8	Correct	180 ms	47812 KB	Output is correct
9	Correct	348 ms	72976 KB	Output is correct
10	Correct	419 ms	72596 KB	Output is correct
11	Correct	345 ms	72856 KB	Output is correct
12	Correct	345 ms	71444 KB	Output is correct
13	Correct	326 ms	78044 KB	Output is correct
14	Correct	176 ms	47524 KB	Output is correct
15	Correct	177 ms	47408 KB	Output is correct
16	Correct	177 ms	47416 KB	Output is correct
17	Correct	174 ms	47388 KB	Output is correct
18	Correct	176 ms	47468 KB	Output is correct
19	Correct	178 ms	47652 KB	Output is correct
20	Correct	181 ms	47716 KB	Output is correct
21	Correct	182 ms	47684 KB	Output is correct
22	Correct	194 ms	47828 KB	Output is correct
23	Correct	183 ms	47936 KB	Output is correct
24	Correct	195 ms	47976 KB	Output is correct
25	Correct	176 ms	47860 KB	Output is correct
26	Correct	179 ms	47868 KB	Output is correct
27	Correct	188 ms	47932 KB	Output is correct
28	Correct	192 ms	48072 KB	Output is correct
29	Correct	184 ms	47840 KB	Output is correct
30	Correct	181 ms	47928 KB	Output is correct
31	Correct	189 ms	47588 KB	Output is correct
32	Correct	180 ms	47828 KB	Output is correct
33	Correct	181 ms	47716 KB	Output is correct
34	Correct	186 ms	47712 KB	Output is correct
35	Correct	174 ms	47428 KB	Output is correct
36	Correct	413 ms	82652 KB	Output is correct
37	Correct	424 ms	83392 KB	Output is correct
38	Correct	360 ms	83652 KB	Output is correct
39	Correct	450 ms	84016 KB	Output is correct
40	Correct	584 ms	80824 KB	Output is correct
41	Correct	179 ms	48100 KB	Output is correct
42	Correct	177 ms	47752 KB	Output is correct
43	Correct	179 ms	47880 KB	Output is correct
44	Correct	536 ms	76996 KB	Output is correct
45	Correct	511 ms	76808 KB	Output is correct
46	Correct	485 ms	76628 KB	Output is correct
47	Correct	567 ms	77252 KB	Output is correct
48	Correct	582 ms	93476 KB	Output is correct
49	Correct	573 ms	93436 KB	Output is correct
50	Correct	582 ms	93380 KB	Output is correct
51	Correct	571 ms	93336 KB	Output is correct
52	Correct	576 ms	93548 KB	Output is correct
53	Correct	693 ms	78132 KB	Output is correct
54	Correct	655 ms	77936 KB	Output is correct
55	Correct	676 ms	78148 KB	Output is correct
56	Correct	670 ms	78116 KB	Output is correct
57	Correct	646 ms	76360 KB	Output is correct
58	Correct	646 ms	77892 KB	Output is correct
59	Correct	525 ms	63720 KB	Output is correct
60	Correct	586 ms	63732 KB	Output is correct
61	Correct	716 ms	77940 KB	Output is correct
62	Correct	655 ms	77952 KB	Output is correct
63	Correct	644 ms	77928 KB	Output is correct
64	Correct	528 ms	63784 KB	Output is correct
65	Incorrect	456 ms	61252 KB	Output isn't correct
66	Halted	0 ms	0 KB	-