답안 #470168

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
470168	2021-09-03T07:23:24 Z	Sohsoh84	Sumtree (INOI20_sumtree)	C++14	50 / 100	754 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);
		return;	
	}

	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 << (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	354 ms	80444 KB	Output is correct
2	Correct	374 ms	80360 KB	Output is correct
3	Correct	362 ms	80404 KB	Output is correct
4	Correct	351 ms	80320 KB	Output is correct
5	Correct	338 ms	76356 KB	Output is correct
6	Correct	178 ms	48056 KB	Output is correct
7	Correct	188 ms	47812 KB	Output is correct
8	Correct	187 ms	47820 KB	Output is correct
9	Correct	368 ms	72716 KB	Output is correct
10	Correct	369 ms	72728 KB	Output is correct
11	Correct	371 ms	72644 KB	Output is correct
12	Correct	378 ms	71468 KB	Output is correct
13	Correct	389 ms	77752 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	179 ms	47452 KB	Output is correct
2	Correct	186 ms	47484 KB	Output is correct
3	Correct	186 ms	47452 KB	Output is correct
4	Correct	180 ms	47452 KB	Output is correct
5	Correct	188 ms	47532 KB	Output is correct
6	Correct	185 ms	47812 KB	Output is correct
7	Correct	195 ms	47856 KB	Output is correct
8	Correct	186 ms	47772 KB	Output is correct
9	Correct	190 ms	47924 KB	Output is correct
10	Correct	187 ms	47952 KB	Output is correct
11	Correct	189 ms	47940 KB	Output is correct
12	Correct	181 ms	47904 KB	Output is correct
13	Correct	186 ms	47940 KB	Output is correct
14	Correct	188 ms	47920 KB	Output is correct
15	Correct	184 ms	48108 KB	Output is correct
16	Correct	185 ms	48044 KB	Output is correct
17	Correct	187 ms	47976 KB	Output is correct
18	Correct	186 ms	47708 KB	Output is correct
19	Correct	183 ms	47992 KB	Output is correct
20	Correct	185 ms	47716 KB	Output is correct
21	Correct	187 ms	47680 KB	Output is correct
22	Correct	180 ms	47556 KB	Output is correct

Subtask #3

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	386 ms	82884 KB	Output is correct
2	Correct	471 ms	83328 KB	Output is correct
3	Correct	383 ms	83656 KB	Output is correct
4	Correct	491 ms	84060 KB	Output is correct
5	Correct	577 ms	80784 KB	Output is correct
6	Correct	182 ms	48312 KB	Output is correct
7	Correct	186 ms	47784 KB	Output is correct
8	Correct	181 ms	47940 KB	Output is correct
9	Correct	594 ms	77152 KB	Output is correct
10	Correct	539 ms	76740 KB	Output is correct
11	Correct	516 ms	76712 KB	Output is correct
12	Correct	567 ms	77340 KB	Output is correct
13	Correct	576 ms	93396 KB	Output is correct
14	Correct	584 ms	93508 KB	Output is correct
15	Correct	584 ms	93388 KB	Output is correct
16	Correct	576 ms	93548 KB	Output is correct
17	Correct	586 ms	93504 KB	Output is correct

Subtask #4

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	700 ms	78276 KB	Output is correct
2	Correct	696 ms	77884 KB	Output is correct
3	Correct	726 ms	78080 KB	Output is correct
4	Correct	754 ms	78040 KB	Output is correct
5	Correct	720 ms	76520 KB	Output is correct
6	Correct	689 ms	78020 KB	Output is correct
7	Correct	556 ms	63812 KB	Output is correct
8	Correct	604 ms	63856 KB	Output is correct
9	Correct	727 ms	78092 KB	Output is correct
10	Correct	706 ms	78020 KB	Output is correct
11	Correct	753 ms	78120 KB	Output is correct
12	Correct	547 ms	63812 KB	Output is correct
13	Incorrect	457 ms	61124 KB	Output isn't correct
14	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	354 ms	80444 KB	Output is correct
2	Correct	374 ms	80360 KB	Output is correct
3	Correct	362 ms	80404 KB	Output is correct
4	Correct	351 ms	80320 KB	Output is correct
5	Correct	338 ms	76356 KB	Output is correct
6	Correct	178 ms	48056 KB	Output is correct
7	Correct	188 ms	47812 KB	Output is correct
8	Correct	187 ms	47820 KB	Output is correct
9	Correct	368 ms	72716 KB	Output is correct
10	Correct	369 ms	72728 KB	Output is correct
11	Correct	371 ms	72644 KB	Output is correct
12	Correct	378 ms	71468 KB	Output is correct
13	Correct	389 ms	77752 KB	Output is correct
14	Correct	179 ms	47452 KB	Output is correct
15	Correct	186 ms	47484 KB	Output is correct
16	Correct	186 ms	47452 KB	Output is correct
17	Correct	180 ms	47452 KB	Output is correct
18	Correct	188 ms	47532 KB	Output is correct
19	Correct	185 ms	47812 KB	Output is correct
20	Correct	195 ms	47856 KB	Output is correct
21	Correct	186 ms	47772 KB	Output is correct
22	Correct	190 ms	47924 KB	Output is correct
23	Correct	187 ms	47952 KB	Output is correct
24	Correct	189 ms	47940 KB	Output is correct
25	Correct	181 ms	47904 KB	Output is correct
26	Correct	186 ms	47940 KB	Output is correct
27	Correct	188 ms	47920 KB	Output is correct
28	Correct	184 ms	48108 KB	Output is correct
29	Correct	185 ms	48044 KB	Output is correct
30	Correct	187 ms	47976 KB	Output is correct
31	Correct	186 ms	47708 KB	Output is correct
32	Correct	183 ms	47992 KB	Output is correct
33	Correct	185 ms	47716 KB	Output is correct
34	Correct	187 ms	47680 KB	Output is correct
35	Correct	180 ms	47556 KB	Output is correct
36	Correct	386 ms	82884 KB	Output is correct
37	Correct	471 ms	83328 KB	Output is correct
38	Correct	383 ms	83656 KB	Output is correct
39	Correct	491 ms	84060 KB	Output is correct
40	Correct	577 ms	80784 KB	Output is correct
41	Correct	182 ms	48312 KB	Output is correct
42	Correct	186 ms	47784 KB	Output is correct
43	Correct	181 ms	47940 KB	Output is correct
44	Correct	594 ms	77152 KB	Output is correct
45	Correct	539 ms	76740 KB	Output is correct
46	Correct	516 ms	76712 KB	Output is correct
47	Correct	567 ms	77340 KB	Output is correct
48	Correct	576 ms	93396 KB	Output is correct
49	Correct	584 ms	93508 KB	Output is correct
50	Correct	584 ms	93388 KB	Output is correct
51	Correct	576 ms	93548 KB	Output is correct
52	Correct	586 ms	93504 KB	Output is correct
53	Correct	700 ms	78276 KB	Output is correct
54	Correct	696 ms	77884 KB	Output is correct
55	Correct	726 ms	78080 KB	Output is correct
56	Correct	754 ms	78040 KB	Output is correct
57	Correct	720 ms	76520 KB	Output is correct
58	Correct	689 ms	78020 KB	Output is correct
59	Correct	556 ms	63812 KB	Output is correct
60	Correct	604 ms	63856 KB	Output is correct
61	Correct	727 ms	78092 KB	Output is correct
62	Correct	706 ms	78020 KB	Output is correct
63	Correct	753 ms	78120 KB	Output is correct
64	Correct	547 ms	63812 KB	Output is correct
65	Incorrect	457 ms	61124 KB	Output isn't correct
66	Halted	0 ms	0 KB	-