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답안 #534475

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
534475 2022-03-08T07:47:37 Z hollwo_pelw Inside information (BOI21_servers) C++17
100 / 100
 544 ms 28992 KB 
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
// #include <ext/rope>

using namespace std;
// using namespace __gnu_cxx;
// using namespace __gnu_pbds;

void Hollwo_Pelw();

signed main(){
#ifndef hollwo_pelw_local
	if (fopen("servers.inp", "r")){
		freopen("servers.inp", "r", stdin);
		freopen("servers.out", "w", stdout);
	}
#else
	auto start = chrono::steady_clock::now();
#endif
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = chrono::steady_clock::now();
	cout << "\nExcution time : " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif
}

#define for_cen(v, w, u) for (auto [v, w] : adj[u]) if (!mark[v])

const int N = 1.2e5 + 5, Q = N << 1;

vector<pair<int, int>> query_q[N];
vector<int> query_c[N];
vector<pair<int, int>> adj[N];

int n, q, siz[N], mark[N];

int find_sz(int u, int p) {
	siz[u] = 1;
	for_cen(v, w, u) if (v != p)
		siz[u] += find_sz(v, u);
	return siz[u];
}

int find_cen(int u, int p, const int &tot) {
	for_cen(v, w, u) if (v != p)
		if (siz[v] > tot / 2) return find_cen(v, u, tot);
	return u;
}

struct fenwick_tree {
	int bit[Q], ver[Q], vercnt;

	inline void clear() { vercnt ++; }

	inline void add(int p, int v) {
		for (; p < Q; p += p & -p) {
			if (ver[p] ^ vercnt)
				ver[p] = vercnt, bit[p] = 0;
			bit[p] += v;
		}
	}

	inline int query(int p) {
		int r = 0;
		for (; p > 0; p -= p & -p) {
			if (ver[p] ^ vercnt)
				ver[p] = vercnt, bit[p] = 0;
			r += bit[p];
		}
		return r;
	}

} bit;

vector<int> inQ, outQ, allinQ;

int res[Q], curin[N], curout[N];

void dfs_in(int u, int p, int cur) {
	inQ.push_back(u);

	for_cen(v, w, u) if (v != p) {
		if (w < cur)
			dfs_in(v, u, w);
	}
}

void dfs_out(int u, int p, int cur) {
	outQ.push_back(u);
	
	bit.add(cur, 1);
	curout[u] = cur;

	for_cen(v, w, u) if (v != p) {
		if (w > cur)
			dfs_out(v, u, w);
	}
}

void centroid_decomp(int r) {
	int tot = find_sz(r, -1);
	r = find_cen(r, -1, tot);

	sort(adj[r].begin(), adj[r].end(), [&](const pair<int, int> &a, const pair<int, int> &b){
		return a.second > b.second;
	});

	bit.clear();

	curin[r] = 0;

	for_cen(v, w, r) {
		inQ.clear();
		outQ.clear();
		dfs_in(v, r, w);

		for (auto u : inQ) {
			for (auto i : query_c[u]) if (i >= w)
				res[i] += 1 + bit.query(i);
			curin[u] = w;
		}

		dfs_out(v, r, w);
	}

	for (auto i : query_c[r])
		res[i] += 1 + bit.query(i);

	reverse(adj[r].begin(), adj[r].end());

	bit.clear();
	
	allinQ.push_back(r);

	for_cen(v, w, r) {
		inQ.clear();
		outQ.clear();
		dfs_in(v, r, w);

		for (auto u : inQ) {
			allinQ.push_back(u);
		}

		dfs_out(v, r, w);

		for (auto u : outQ) {
			for (auto [i, v] : query_q[u])
				if (curin[v] != -1 && curin[v] < w && i > curout[u]) {
					res[i] = 1;
				}
		}
	}

	for (auto [i, v] : query_q[r])
		if (curin[v] != -1 && i > curin[v]) {
			res[i] = 1;
		}

	for (auto u : allinQ)
		curin[u] = -1;

	allinQ.clear();

	mark[r] = 1;
	for_cen(v, w, r)
		centroid_decomp(v);
}

char t[Q];

void Hollwo_Pelw(){
	cin >> n >> q, q += n - 1;
	for (int i = 1, u, v; i <= q; i++) {
		cin >> t[i];
		if (t[i] == 'S') {
			cin >> u >> v;
			adj[u].emplace_back(v, i);
			adj[v].emplace_back(u, i);
		}
		if (t[i] == 'Q') {
			cin >> u >> v;
			query_q[u].emplace_back(i, v);
		}
		if (t[i] == 'C') {
			cin >> u;
			query_c[u].push_back(i);
		}
	}

	memset(curin, -1, sizeof curin);

	centroid_decomp(1);

	for (int i = 1; i <= q; i++) {
		if (t[i] == 'Q')
			cout << (res[i] ? "yes\n" : "no\n");
		if (t[i] == 'C')
			cout << res[i] << '\n';
	}

}

Compilation message

servers.cpp: In function 'int main()':
servers.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   freopen("servers.inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
servers.cpp:16:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   freopen("servers.out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
2.5 / 2.5

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 12336 KB Output is correct
2 Correct 39 ms 12724 KB Output is correct
3 Correct 32 ms 12872 KB Output is correct
4 Correct 37 ms 12868 KB Output is correct
5 Correct 39 ms 12228 KB Output is correct
6 Correct 32 ms 12420 KB Output is correct

Subtask #2
2.5 / 2.5

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 12336 KB Output is correct
2 Correct 39 ms 12724 KB Output is correct
3 Correct 32 ms 12872 KB Output is correct
4 Correct 37 ms 12868 KB Output is correct
5 Correct 39 ms 12228 KB Output is correct
6 Correct 32 ms 12420 KB Output is correct
7 Correct 24 ms 12512 KB Output is correct
8 Correct 41 ms 12612 KB Output is correct
9 Correct 35 ms 12564 KB Output is correct
10 Correct 44 ms 12656 KB Output is correct
11 Correct 46 ms 12816 KB Output is correct
12 Correct 36 ms 12648 KB Output is correct

Subtask #3
2.5 / 2.5

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 12492 KB Output is correct
2 Correct 152 ms 21952 KB Output is correct
3 Correct 148 ms 21932 KB Output is correct

Subtask #4
2.5 / 2.5

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 12492 KB Output is correct
2 Correct 152 ms 21952 KB Output is correct
3 Correct 148 ms 21932 KB Output is correct
4 Correct 34 ms 12520 KB Output is correct
5 Correct 198 ms 21856 KB Output is correct
6 Correct 101 ms 20504 KB Output is correct
7 Correct 133 ms 20372 KB Output is correct

Subtask #5
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 33 ms 12552 KB Output is correct
2 Correct 259 ms 27716 KB Output is correct
3 Correct 231 ms 27716 KB Output is correct
4 Correct 227 ms 28348 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 33 ms 12552 KB Output is correct
2 Correct 259 ms 27716 KB Output is correct
3 Correct 231 ms 27716 KB Output is correct
4 Correct 227 ms 28348 KB Output is correct
5 Correct 25 ms 12492 KB Output is correct
6 Correct 235 ms 28192 KB Output is correct
7 Correct 261 ms 28992 KB Output is correct
8 Correct 230 ms 27588 KB Output is correct
9 Correct 235 ms 27600 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 12364 KB Output is correct
2 Correct 234 ms 21504 KB Output is correct
3 Correct 191 ms 21048 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 12364 KB Output is correct
2 Correct 234 ms 21504 KB Output is correct
3 Correct 191 ms 21048 KB Output is correct
4 Correct 26 ms 12508 KB Output is correct
5 Correct 295 ms 22508 KB Output is correct
6 Correct 189 ms 21316 KB Output is correct

Subtask #9
12.5 / 12.5

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 12484 KB Output is correct
2 Correct 320 ms 27784 KB Output is correct
3 Correct 218 ms 27716 KB Output is correct
4 Correct 246 ms 28400 KB Output is correct
5 Correct 25 ms 12352 KB Output is correct
6 Correct 195 ms 21460 KB Output is correct
7 Correct 191 ms 20992 KB Output is correct
8 Correct 255 ms 20844 KB Output is correct
9 Correct 207 ms 21872 KB Output is correct
10 Correct 343 ms 25536 KB Output is correct
11 Correct 252 ms 23800 KB Output is correct

Subtask #10
12.5 / 12.5

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 12484 KB Output is correct
2 Correct 320 ms 27784 KB Output is correct
3 Correct 218 ms 27716 KB Output is correct
4 Correct 246 ms 28400 KB Output is correct
5 Correct 25 ms 12352 KB Output is correct
6 Correct 195 ms 21460 KB Output is correct
7 Correct 191 ms 20992 KB Output is correct
8 Correct 255 ms 20844 KB Output is correct
9 Correct 207 ms 21872 KB Output is correct
10 Correct 343 ms 25536 KB Output is correct
11 Correct 252 ms 23800 KB Output is correct
12 Correct 24 ms 12528 KB Output is correct
13 Correct 252 ms 28160 KB Output is correct
14 Correct 229 ms 28940 KB Output is correct
15 Correct 254 ms 27680 KB Output is correct
16 Correct 243 ms 27684 KB Output is correct
17 Correct 24 ms 12492 KB Output is correct
18 Correct 247 ms 22708 KB Output is correct
19 Correct 213 ms 21304 KB Output is correct
20 Correct 223 ms 22448 KB Output is correct
21 Correct 220 ms 22368 KB Output is correct
22 Correct 303 ms 24704 KB Output is correct
23 Correct 544 ms 25060 KB Output is correct
24 Correct 427 ms 24380 KB Output is correct

Subtask #11
17.5 / 17.5

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 12360 KB Output is correct
2 Correct 36 ms 12788 KB Output is correct
3 Correct 33 ms 12824 KB Output is correct
4 Correct 35 ms 12776 KB Output is correct
5 Correct 33 ms 12228 KB Output is correct
6 Correct 34 ms 12528 KB Output is correct
7 Correct 23 ms 12524 KB Output is correct
8 Correct 145 ms 21940 KB Output is correct
9 Correct 143 ms 21944 KB Output is correct
10 Correct 23 ms 12380 KB Output is correct
11 Correct 240 ms 27692 KB Output is correct
12 Correct 229 ms 27704 KB Output is correct
13 Correct 208 ms 28436 KB Output is correct
14 Correct 29 ms 12504 KB Output is correct
15 Correct 206 ms 21460 KB Output is correct
16 Correct 204 ms 21000 KB Output is correct
17 Correct 201 ms 20840 KB Output is correct
18 Correct 209 ms 21888 KB Output is correct
19 Correct 282 ms 25492 KB Output is correct
20 Correct 292 ms 23780 KB Output is correct
21 Correct 161 ms 22096 KB Output is correct
22 Correct 178 ms 21712 KB Output is correct
23 Correct 178 ms 21508 KB Output is correct
24 Correct 169 ms 21512 KB Output is correct
25 Correct 260 ms 25120 KB Output is correct
26 Correct 252 ms 20476 KB Output is correct
27 Correct 282 ms 20496 KB Output is correct

Subtask #12
17.5 / 17.5

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 12360 KB Output is correct
2 Correct 36 ms 12788 KB Output is correct
3 Correct 33 ms 12824 KB Output is correct
4 Correct 35 ms 12776 KB Output is correct
5 Correct 33 ms 12228 KB Output is correct
6 Correct 34 ms 12528 KB Output is correct
7 Correct 23 ms 12524 KB Output is correct
8 Correct 145 ms 21940 KB Output is correct
9 Correct 143 ms 21944 KB Output is correct
10 Correct 23 ms 12380 KB Output is correct
11 Correct 240 ms 27692 KB Output is correct
12 Correct 229 ms 27704 KB Output is correct
13 Correct 208 ms 28436 KB Output is correct
14 Correct 29 ms 12504 KB Output is correct
15 Correct 206 ms 21460 KB Output is correct
16 Correct 204 ms 21000 KB Output is correct
17 Correct 201 ms 20840 KB Output is correct
18 Correct 209 ms 21888 KB Output is correct
19 Correct 282 ms 25492 KB Output is correct
20 Correct 292 ms 23780 KB Output is correct
21 Correct 161 ms 22096 KB Output is correct
22 Correct 178 ms 21712 KB Output is correct
23 Correct 178 ms 21508 KB Output is correct
24 Correct 169 ms 21512 KB Output is correct
25 Correct 260 ms 25120 KB Output is correct
26 Correct 252 ms 20476 KB Output is correct
27 Correct 282 ms 20496 KB Output is correct
28 Correct 25 ms 12492 KB Output is correct
29 Correct 38 ms 12604 KB Output is correct
30 Correct 35 ms 12548 KB Output is correct
31 Correct 41 ms 12632 KB Output is correct
32 Correct 45 ms 12912 KB Output is correct
33 Correct 34 ms 12636 KB Output is correct
34 Correct 23 ms 12540 KB Output is correct
35 Correct 138 ms 21820 KB Output is correct
36 Correct 139 ms 20540 KB Output is correct
37 Correct 101 ms 20408 KB Output is correct
38 Correct 25 ms 12492 KB Output is correct
39 Correct 232 ms 28168 KB Output is correct
40 Correct 258 ms 28936 KB Output is correct
41 Correct 226 ms 27644 KB Output is correct
42 Correct 261 ms 27572 KB Output is correct
43 Correct 24 ms 12492 KB Output is correct
44 Correct 235 ms 22472 KB Output is correct
45 Correct 220 ms 21272 KB Output is correct
46 Correct 211 ms 22448 KB Output is correct
47 Correct 247 ms 22384 KB Output is correct
48 Correct 293 ms 24700 KB Output is correct
49 Correct 479 ms 25004 KB Output is correct
50 Correct 471 ms 24392 KB Output is correct
51 Correct 119 ms 20492 KB Output is correct
52 Correct 108 ms 20548 KB Output is correct
53 Correct 105 ms 20316 KB Output is correct
54 Correct 104 ms 20504 KB Output is correct
55 Correct 104 ms 20908 KB Output is correct
56 Correct 201 ms 20896 KB Output is correct
57 Correct 206 ms 23380 KB Output is correct
58 Correct 324 ms 21356 KB Output is correct
59 Correct 269 ms 20680 KB Output is correct