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답안 #408295

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
408295 2021-05-19T06:52:32 Z flappybird Unique Cities (JOI19_ho_t5) C++14
4 / 100
 2000 ms 147752 KB 
#include <bits/stdc++.h>
#include <unordered_map>
#pragma GCC optimize("O3")
using namespace std;
typedef long ll;
typedef pair<ll, ll> pll;
#define MAX 201010
#define MAXS 18
#define INF 1000000000000000001
#define bb ' '
#define ln '\n'
struct segtree {
	ll N;
	ll s;
	vector<ll> tree, l, r;
	void update(ll x, ll a) {
		x += s - 1;
		tree[x] = a;
		x /= 2;
		while (x) tree[x] = max(tree[x << 1], tree[(x << 1) + 1]), x >>= 1;
	}
	ll query(ll low, ll high, ll loc = 1) {
		if (l[loc] == low && r[loc] == high) return tree[loc];
		if (r[loc << 1] >= high) return query(low, high, loc << 1);
		if (l[(loc << 1) + 1] <= low) return query(low, high, (loc << 1) + 1);
		return max(query(low, r[loc << 1], loc << 1), query(l[(loc << 1) + 1], high, (loc << 1) + 1));
	}
	void init(ll x = 1) {
		if (x >= s) {
			l[x] = r[x] = x - s + 1;
			return;
		}
		init(x * 2);
		init(x * 2 + 1);
		l[x] = l[x << 1];
		r[x] = r[x * 2 + 1];
	}
	segtree(ll n) {
		N = n;
		s = (ll)1 << (ll)ceil(log2(N));
		tree.resize(2 * s + 1);
		l.resize(2 * s + 1);
		r.resize(2 * s + 1);
		init();
	}
};
vector<ll> adj[MAX], sav[MAX], savdis[MAX], rev[MAX];
ll dir[MAX], ddir[MAX], dddir[MAX];
vector<vector<ll>> chain;
vector<set<ll>> subtree, revtree;
vector<segtree> chainseg;
ll C[MAX], depth[MAX], mxdepv[MAX];
ll mxdep[MAX];
ll sp[MAX][MAXS];
ll cnt;
ll num[MAX];
pll cnum[MAX];
ll ans[MAX];
ll arr[MAX];
ll prtind[MAX];
ll init(ll x, ll p = 0, ll d = 0) {
	sp[x][0] = p;
	ll i;
	for (i = 1; i < MAXS; i++) sp[x][i] = sp[sp[x][i - 1]][i - 1];
	depth[x] = d;
	ll sum = 1;
	sav[x].resize(adj[x].size());
	savdis[x].resize(adj[x].size());
	rev[x].resize(adj[x].size());
	for (i = 0; i < adj[x].size(); i++) {
		if (adj[x][i] == p) prtind[x] = i;
		else sum += init(adj[x][i], x, d + 1);
	}
	return num[x] = sum;
}
void calc(ll x, ll p = 0) {
	ll i;
	ll mx = 0;
	mxdepv[x] = x;
	for (i = 0; i < adj[x].size(); i++) {
		if (adj[x][i] == p) continue;
		calc(adj[x][i], x);
		if (mx < depth[mxdepv[adj[x][i]]]) mx = depth[mxdepv[adj[x][i]]], mxdepv[x] = mxdepv[adj[x][i]];
		sav[x][i] = mxdepv[adj[x][i]];
		savdis[x][i] = depth[sav[x][i]] - depth[x];
	}
	ll cnt = 0;
	ll vv, vvv;
	vv = vvv = -1;
	ll nv = -1;
	ll nmx = 0;
	for (auto v : adj[x]) {
		if (v == p) continue;
		if (depth[mxdepv[v]] == mx) cnt++, vvv = vv, vv = v;
		else if (depth[mxdepv[v]] > nmx) nmx = depth[mxdepv[v]], nv = v;
	}
	if (cnt >= 2) {
		for (i = 0; i < adj[x].size(); i++) {
			if (adj[x][i] != p) {
				rev[x][i] = (adj[x][i] == vv ? vvv : vv);
			}
		}
	}
	else {
		for (i = 0; i < adj[x].size(); i++) {
			if (adj[x][i] != p) {
				rev[x][i] = (adj[x][i] == vv ? nv : vv);
			}
		}
	}
	for (i = 0; i < adj[x].size(); i++) {
		if (adj[x][i] == p) continue;
		if (rev[x][i] == -1) rev[x][i] = x;
		else rev[x][i] = mxdepv[rev[x][i]];
	}
}
void make_chain(ll x, ll p = 0) {
	ll mx, mv;
	mx = mv = 0;
	chain[cnt].push_back(x);
	cnum[x] = { cnt, chain[cnt].size() - 1 };
	for (auto v : adj[x]) {
		if (v == p) continue;
		if (mx < num[v]) mx = num[v], mv = v;
	}
	if (mv) make_chain(mv, x);
	for (auto v : adj[x]) {
		if (v == p || v == mv) continue;
		cnt++;
		chain.push_back(vector<ll>());
		make_chain(v, x);
	}
}
void make_tree() {
	ll i;
	for (i = 0; i < chain.size(); i++) chainseg.push_back(segtree(chain[i].size()));
}
void update(ll v, ll x) {
	chainseg[cnum[v].first].update(cnum[v].second + 1, x);
}
//1을 루트로 하는 LCA
ll lca(ll u, ll v) {
	if (depth[u] != depth[v]) {
		if (depth[u] < depth[v]) swap(u, v);
		ll i;
		for (i = MAXS - 1; i >= 0; i--) if (depth[sp[u][i]] >= depth[v]) u = sp[u][i];
	}
	if (u == v) return u;
	ll i;
	for (i = MAXS - 1; i >= 0; i--) if (sp[u][i] != sp[v][i]) u = sp[u][i], v = sp[v][i];
	return sp[v][0];
}
//HLD query
ll mxval(ll u, ll v) {
	ll ans = 0;
	ll l = lca(u, v);
	while (cnum[u].first != cnum[l].first) ans = max(ans, chainseg[cnum[u].first].query(1, cnum[u].second + 1)), u = sp[chain[cnum[u].first][0]][0];
	while (cnum[v].first != cnum[l].first) ans = max(ans, chainseg[cnum[v].first].query(1, cnum[v].second + 1)), v = sp[chain[cnum[v].first][0]][0];
	ans = max(ans, chainseg[cnum[l].first].query(cnum[l].second + 1, cnum[u].second + 1));
	ans = max(ans, chainseg[cnum[l].first].query(cnum[l].second + 1, cnum[v].second + 1));
	return ans;
}
//두 정점 사이 거리
ll dis(ll u, ll v) { return depth[u] + depth[v] - 2 * depth[lca(u, v)]; }
ll dis(ll u, ll v, ll l) { return depth[u] + depth[v] - 2 * depth[l]; }
//r이 루트, v의 x번째 부모
ll prtx(ll r, ll v, ll x) {
	if (x == 0) return v;
	ll l = lca(r, v);
	ll rv = dis(r, v, l);
	if (rv < x) return 0;
	if (dis(l, v, l) < x) {
		ll d = rv - x;
		ll i;
		for (i = MAXS - 1; i >= 0; i--) if (d - (1 << i) >= 0) d -= (1 << i), r = sp[r][i];
		return r;
	}
	else {
		ll i;
		for (i = MAXS - 1; i >= 0; i--) if (x - (1 << i) >= 0) x -= (1 << i), v = sp[v][i];
		return v;
	}
}
ll getfar(ll v, ll ban) {
	if (dir[v] != ban) return dir[v];
	return ddir[v];
}
ll getfar(ll v, ll ban1, ll ban2) {
	if (ban1 > ban2) swap(ban1, ban2);
	if (ban2 == -1) return dir[v];
	if (ban1 == -1) return getfar(v, ban2);
	if (dir[v] != ban1 && dir[v] != ban2) return dir[v];
	if (ddir[v] != ban1 && ddir[v] != ban2) return ddir[v];
	return dddir[v];
}
ll getind(vector<ll>& v, ll c) {
	return lower_bound(v.begin(), v.end(), c) - v.begin();
}
//r1 : previous root, adj[r1][ind]=r2
void prop(ll r1, ll r2, ll ind) {
	arr[r2] = 0, update(r2, arr[r2]);
	ll f1 = getfar(r1, ind);
	ll f2 = getfar(r1, ind, f1);
	if (f1 == -1) arr[r1] = 0, update(r1, 0);
	else if (f2 == -1) arr[r1] = savdis[r1][f1], update(r1, arr[r1]);
	else arr[r1] = savdis[r1][f1] + savdis[r1][f2], update(r1, arr[r1]);
}
void dfs(ll x, ll p = 0) {
	ll i;
	for (i = 0; i < adj[x].size(); i++) {
		ll farv = sav[x][i];
		if (mxval(farv, adj[x][i]) >= savdis[x][i]) continue;
		ll xx = (savdis[x][i] - 1) / 2;
		ll root = prtx(x, farv, xx);
		if (lca(root, x) == root) revtree[prtx(x, root, 1)].insert(C[x]);
		else subtree[root].insert(C[x]);
	}
	ll v;
	for (i = 0; i < adj[x].size(); i++) {
		v = adj[x][i];
		if (v == p) continue;
		ll p1, p2;
		p1 = arr[x];
		p2 = arr[v];
		prop(x, v, i);
		dfs(v, x);
		arr[x] = p1;
		arr[v] = p2;
		update(x, arr[x]);
		update(v, arr[v]);
	}
}
ll mp[MAX];
ll anscnt;
void getans(ll x, ll p = 0) {
	for (auto c : subtree[x]) {
		if (!mp[c]) anscnt++;
		mp[c]++;
	}
	for (auto c : revtree[x]) {
		mp[c]--;
		if (!mp[c]) anscnt--;
	}
	ans[x] = anscnt;
	for (auto v : adj[x]) {
		if (v == p) continue;
		getans(v, x);
	}
	for (auto c : revtree[x]) {
		if (!mp[c]) anscnt++;
		mp[c]++;
	}
	for (auto c : subtree[x]) {
		mp[c]--;
		if (!mp[c]) anscnt--;
	}
}
void calcp(ll x, ll p = 0, ll ind = 0) {
	if (x != 1) {
		ll tmp = prtind[x];
		if (p == 1) sav[x][tmp] = rev[p][ind];
		else {
			ll v1 = rev[p][ind];
			ll v2 = sav[p][prtind[p]];
			if (v1 > v2) swap(v1, v2);
			if (dis(x, v1) >= dis(x, v2)) sav[x][tmp] = v1;
			else sav[x][tmp] = v2;
		}
		savdis[x][tmp] = dis(x, sav[x][tmp]);
	}
	ll i;
	for (i = 0; i < adj[x].size(); i++) if (adj[x][i] != p) calcp(adj[x][i], x, i);
}
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	depth[0] = -1;
	ll N, M;
	cin >> N >> M;
	ll i, j;
	ll a, b;
	for (i = 1; i < N; i++) cin >> a >> b, adj[a].push_back(b), adj[b].push_back(a);
	for (i = 1; i <= N; i++) cin >> C[i];
	for (i = 1; i <= N; i++) sort(adj[i].begin(), adj[i].end());
	init(1);
	calc(1);
	calcp(1);
	cnt = 0;
	chain.push_back(vector<ll>());
	make_chain(1);
	make_tree();
	//400ms
	for (i = 1; i <= N; i++) {
		ll m1, m2, m3;
		m1 = m2 = m3 = 0;
		dir[i] = ddir[i] = dddir[i] = -1;
		for (j = adj[i].size() - 1; j >= 0; j--) {
			if (m1 <= savdis[i][j]) dddir[i] = ddir[i], ddir[i] = dir[i], dir[i] = j, m3 = m2, m2 = m1, m1 = savdis[i][j];
			else if (m2 <= savdis[i][j]) dddir[i] = ddir[i], ddir[i] = j, m3 = m2, m2 = savdis[i][j];
			else if (m3 <= savdis[i][j]) dddir[i] = j, m3 = savdis[i][j];
		}
		if (i != 1) {
			ll p = prtind[i];
			ll r = getfar(i, p);
			ll rr = getfar(i, p, r);
			ll xx = 0;
			if (r != -1) xx += savdis[i][r];
			if (rr != -1) xx += savdis[i][rr];
			arr[i] = xx;
			update(i, xx);
		}
	}
	subtree.resize(N + 1);
	revtree.resize(N + 1);
	dfs(1);
	for (i = 1; i <= N; i++) for (auto c : revtree[i]) if (!(mp[c]++)) anscnt++;
	getans(1);
	for (i = 1; i <= N; i++) cout << ans[i] << ln;
}

Compilation message

joi2019_ho_t5.cpp: In function 'll init(ll, ll, ll)':
joi2019_ho_t5.cpp:70:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void calc(ll, ll)':
joi2019_ho_t5.cpp:80:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:98:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |   for (i = 0; i < adj[x].size(); i++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:105:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |   for (i = 0; i < adj[x].size(); i++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:111:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void make_tree()':
joi2019_ho_t5.cpp:136:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<std::vector<long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |  for (i = 0; i < chain.size(); i++) chainseg.push_back(segtree(chain[i].size()));
      |              ~~^~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void dfs(ll, ll)':
joi2019_ho_t5.cpp:210:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  210 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:219:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  219 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void calcp(ll, ll, ll)':
joi2019_ho_t5.cpp:272:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  272 |  for (i = 0; i < adj[x].size(); i++) if (adj[x][i] != p) calcp(adj[x][i], x, i);
      |              ~~^~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 19192 KB Output is correct
2 Correct 24 ms 20476 KB Output is correct
3 Correct 19 ms 20000 KB Output is correct
4 Correct 25 ms 20392 KB Output is correct
5 Correct 21 ms 20556 KB Output is correct
6 Correct 28 ms 20568 KB Output is correct
7 Correct 24 ms 20468 KB Output is correct
8 Correct 22 ms 20620 KB Output is correct
9 Correct 24 ms 20596 KB Output is correct
10 Correct 24 ms 20492 KB Output is correct
11 Correct 24 ms 20624 KB Output is correct
12 Correct 23 ms 20772 KB Output is correct
13 Correct 25 ms 20592 KB Output is correct
14 Correct 25 ms 20588 KB Output is correct
15 Correct 23 ms 20616 KB Output is correct
16 Correct 17 ms 20884 KB Output is correct
17 Correct 22 ms 20704 KB Output is correct
18 Correct 23 ms 20556 KB Output is correct
19 Correct 23 ms 20516 KB Output is correct
20 Correct 28 ms 20688 KB Output is correct
21 Correct 25 ms 20548 KB Output is correct
22 Correct 21 ms 20492 KB Output is correct
23 Correct 20 ms 20568 KB Output is correct
24 Correct 19 ms 20592 KB Output is correct
25 Correct 19 ms 20584 KB Output is correct
26 Correct 19 ms 20772 KB Output is correct
27 Correct 25 ms 20780 KB Output is correct
28 Correct 24 ms 20772 KB Output is correct
29 Correct 24 ms 20556 KB Output is correct
30 Correct 19 ms 20764 KB Output is correct
31 Correct 30 ms 20732 KB Output is correct
32 Correct 24 ms 20612 KB Output is correct

Subtask #2
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 868 ms 93332 KB Output is correct
2 Correct 1457 ms 97244 KB Output is correct
3 Correct 193 ms 37012 KB Output is correct
4 Correct 1509 ms 147752 KB Output is correct
5 Execution timed out 2096 ms 142508 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #3
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1249 ms 123820 KB Output is correct
2 Execution timed out 2064 ms 147000 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 19192 KB Output is correct
2 Correct 24 ms 20476 KB Output is correct
3 Correct 19 ms 20000 KB Output is correct
4 Correct 25 ms 20392 KB Output is correct
5 Correct 21 ms 20556 KB Output is correct
6 Correct 28 ms 20568 KB Output is correct
7 Correct 24 ms 20468 KB Output is correct
8 Correct 22 ms 20620 KB Output is correct
9 Correct 24 ms 20596 KB Output is correct
10 Correct 24 ms 20492 KB Output is correct
11 Correct 24 ms 20624 KB Output is correct
12 Correct 23 ms 20772 KB Output is correct
13 Correct 25 ms 20592 KB Output is correct
14 Correct 25 ms 20588 KB Output is correct
15 Correct 23 ms 20616 KB Output is correct
16 Correct 17 ms 20884 KB Output is correct
17 Correct 22 ms 20704 KB Output is correct
18 Correct 23 ms 20556 KB Output is correct
19 Correct 23 ms 20516 KB Output is correct
20 Correct 28 ms 20688 KB Output is correct
21 Correct 25 ms 20548 KB Output is correct
22 Correct 21 ms 20492 KB Output is correct
23 Correct 20 ms 20568 KB Output is correct
24 Correct 19 ms 20592 KB Output is correct
25 Correct 19 ms 20584 KB Output is correct
26 Correct 19 ms 20772 KB Output is correct
27 Correct 25 ms 20780 KB Output is correct
28 Correct 24 ms 20772 KB Output is correct
29 Correct 24 ms 20556 KB Output is correct
30 Correct 19 ms 20764 KB Output is correct
31 Correct 30 ms 20732 KB Output is correct
32 Correct 24 ms 20612 KB Output is correct
33 Correct 868 ms 93332 KB Output is correct
34 Correct 1457 ms 97244 KB Output is correct
35 Correct 193 ms 37012 KB Output is correct
36 Correct 1509 ms 147752 KB Output is correct
37 Execution timed out 2096 ms 142508 KB Time limit exceeded
38 Halted 0 ms 0 KB -