답안 #470159

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
470159	2021-09-03T07:02:24 Z	Sohsoh84	Sumtree (INOI20_sumtree)	C++14	50 / 100	721 ms	98664 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 ?

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) {
	ans = ans * val % MOD * 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 << ans << 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 << ans << endl;
	}
	return 0;
}

Subtask #1

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	349 ms	80372 KB	Output is correct
2	Correct	372 ms	80332 KB	Output is correct
3	Correct	344 ms	80400 KB	Output is correct
4	Correct	379 ms	80428 KB	Output is correct
5	Correct	329 ms	76336 KB	Output is correct
6	Correct	180 ms	47988 KB	Output is correct
7	Correct	180 ms	47812 KB	Output is correct
8	Correct	176 ms	47828 KB	Output is correct
9	Correct	343 ms	72672 KB	Output is correct
10	Correct	346 ms	72800 KB	Output is correct
11	Correct	362 ms	72664 KB	Output is correct
12	Correct	329 ms	71364 KB	Output is correct
13	Correct	319 ms	77912 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	177 ms	47332 KB	Output is correct
2	Correct	177 ms	47424 KB	Output is correct
3	Correct	178 ms	47452 KB	Output is correct
4	Correct	174 ms	47428 KB	Output is correct
5	Correct	177 ms	47656 KB	Output is correct
6	Correct	184 ms	47684 KB	Output is correct
7	Correct	181 ms	47692 KB	Output is correct
8	Correct	181 ms	47752 KB	Output is correct
9	Correct	180 ms	47936 KB	Output is correct
10	Correct	188 ms	47964 KB	Output is correct
11	Correct	194 ms	47940 KB	Output is correct
12	Correct	180 ms	47960 KB	Output is correct
13	Correct	191 ms	48068 KB	Output is correct
14	Correct	184 ms	47864 KB	Output is correct
15	Correct	180 ms	48068 KB	Output is correct
16	Correct	183 ms	48080 KB	Output is correct
17	Correct	183 ms	47960 KB	Output is correct
18	Correct	180 ms	47680 KB	Output is correct
19	Correct	183 ms	47896 KB	Output is correct
20	Correct	176 ms	47684 KB	Output is correct
21	Correct	182 ms	47668 KB	Output is correct
22	Correct	182 ms	47444 KB	Output is correct

Subtask #3

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	369 ms	82696 KB	Output is correct
2	Correct	405 ms	85736 KB	Output is correct
3	Correct	383 ms	85988 KB	Output is correct
4	Correct	438 ms	86688 KB	Output is correct
5	Correct	580 ms	84400 KB	Output is correct
6	Correct	186 ms	48080 KB	Output is correct
7	Correct	180 ms	47876 KB	Output is correct
8	Correct	190 ms	47832 KB	Output is correct
9	Correct	561 ms	80288 KB	Output is correct
10	Correct	501 ms	79588 KB	Output is correct
11	Correct	490 ms	79572 KB	Output is correct
12	Correct	562 ms	79524 KB	Output is correct
13	Correct	582 ms	98608 KB	Output is correct
14	Correct	591 ms	98612 KB	Output is correct
15	Correct	584 ms	98544 KB	Output is correct
16	Correct	579 ms	98664 KB	Output is correct
17	Correct	585 ms	98580 KB	Output is correct

Subtask #4

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	721 ms	79556 KB	Output is correct
2	Correct	682 ms	82012 KB	Output is correct
3	Correct	666 ms	82204 KB	Output is correct
4	Correct	705 ms	82256 KB	Output is correct
5	Correct	650 ms	80524 KB	Output is correct
6	Correct	676 ms	82052 KB	Output is correct
7	Correct	536 ms	66608 KB	Output is correct
8	Correct	589 ms	66628 KB	Output is correct
9	Correct	714 ms	82132 KB	Output is correct
10	Correct	689 ms	82340 KB	Output is correct
11	Correct	696 ms	82304 KB	Output is correct
12	Correct	551 ms	66620 KB	Output is correct
13	Incorrect	478 ms	64348 KB	Output isn't correct
14	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	349 ms	80372 KB	Output is correct
2	Correct	372 ms	80332 KB	Output is correct
3	Correct	344 ms	80400 KB	Output is correct
4	Correct	379 ms	80428 KB	Output is correct
5	Correct	329 ms	76336 KB	Output is correct
6	Correct	180 ms	47988 KB	Output is correct
7	Correct	180 ms	47812 KB	Output is correct
8	Correct	176 ms	47828 KB	Output is correct
9	Correct	343 ms	72672 KB	Output is correct
10	Correct	346 ms	72800 KB	Output is correct
11	Correct	362 ms	72664 KB	Output is correct
12	Correct	329 ms	71364 KB	Output is correct
13	Correct	319 ms	77912 KB	Output is correct
14	Correct	177 ms	47332 KB	Output is correct
15	Correct	177 ms	47424 KB	Output is correct
16	Correct	178 ms	47452 KB	Output is correct
17	Correct	174 ms	47428 KB	Output is correct
18	Correct	177 ms	47656 KB	Output is correct
19	Correct	184 ms	47684 KB	Output is correct
20	Correct	181 ms	47692 KB	Output is correct
21	Correct	181 ms	47752 KB	Output is correct
22	Correct	180 ms	47936 KB	Output is correct
23	Correct	188 ms	47964 KB	Output is correct
24	Correct	194 ms	47940 KB	Output is correct
25	Correct	180 ms	47960 KB	Output is correct
26	Correct	191 ms	48068 KB	Output is correct
27	Correct	184 ms	47864 KB	Output is correct
28	Correct	180 ms	48068 KB	Output is correct
29	Correct	183 ms	48080 KB	Output is correct
30	Correct	183 ms	47960 KB	Output is correct
31	Correct	180 ms	47680 KB	Output is correct
32	Correct	183 ms	47896 KB	Output is correct
33	Correct	176 ms	47684 KB	Output is correct
34	Correct	182 ms	47668 KB	Output is correct
35	Correct	182 ms	47444 KB	Output is correct
36	Correct	369 ms	82696 KB	Output is correct
37	Correct	405 ms	85736 KB	Output is correct
38	Correct	383 ms	85988 KB	Output is correct
39	Correct	438 ms	86688 KB	Output is correct
40	Correct	580 ms	84400 KB	Output is correct
41	Correct	186 ms	48080 KB	Output is correct
42	Correct	180 ms	47876 KB	Output is correct
43	Correct	190 ms	47832 KB	Output is correct
44	Correct	561 ms	80288 KB	Output is correct
45	Correct	501 ms	79588 KB	Output is correct
46	Correct	490 ms	79572 KB	Output is correct
47	Correct	562 ms	79524 KB	Output is correct
48	Correct	582 ms	98608 KB	Output is correct
49	Correct	591 ms	98612 KB	Output is correct
50	Correct	584 ms	98544 KB	Output is correct
51	Correct	579 ms	98664 KB	Output is correct
52	Correct	585 ms	98580 KB	Output is correct
53	Correct	721 ms	79556 KB	Output is correct
54	Correct	682 ms	82012 KB	Output is correct
55	Correct	666 ms	82204 KB	Output is correct
56	Correct	705 ms	82256 KB	Output is correct
57	Correct	650 ms	80524 KB	Output is correct
58	Correct	676 ms	82052 KB	Output is correct
59	Correct	536 ms	66608 KB	Output is correct
60	Correct	589 ms	66628 KB	Output is correct
61	Correct	714 ms	82132 KB	Output is correct
62	Correct	689 ms	82340 KB	Output is correct
63	Correct	696 ms	82304 KB	Output is correct
64	Correct	551 ms	66620 KB	Output is correct
65	Incorrect	478 ms	64348 KB	Output isn't correct
66	Halted	0 ms	0 KB	-