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답안 #405604

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
405604 2021-05-16T15:02:54 Z flappybird Unique Cities (JOI19_ho_t5) C++14
4 / 100
 2000 ms 147080 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 * 2], tree[x * 2 + 1]), x /= 2;
	}
	ll query(ll low, ll high, ll loc = 1) {
		if (l[loc] == low && r[loc] == high) return tree[loc];
		if (r[loc * 2] >= high) return query(low, high, loc * 2);
		if (l[loc * 2 + 1] <= low) return query(low, high, loc * 2 + 1);
		return max(query(low, r[loc * 2], loc * 2), query(l[loc * 2 + 1], high, loc * 2 + 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 * 2];
		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 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 (auto v : adj[x]) {
		if (v == p) continue;
		sum += init(v, 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) {
	if (ddir[r2] == -1) arr[r2] = savdis[r2][dir[r2]], update(r2, arr[r2]);
	else arr[r2] = savdis[r2][dir[r2]] + savdis[r2][ddir[r2]], 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 fardir = getfar(adj[x][i], getind(adj[adj[x][i]], x));
		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) {
	if (x != 1) {
		ll tmp = getind(adj[x], p);
		if (p == 1) sav[x][tmp] = rev[p][getind(adj[p], x)];
		else {
			ll v1 = rev[p][getind(adj[p], x)];
			ll v2 = sav[p][getind(adj[p], sp[p][0])];
			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]);
	}
	for (auto v : adj[x]) if (v != p) calcp(v, x);
}
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 mx = 0;
		dir[i] = ddir[i] = dddir[i] = -1;
		for (j = 0; j < adj[i].size(); j++) if (mx < savdis[i][j]) mx = savdis[i][j], dir[i] = j;
		mx = 0;
		for (j = 0; j < adj[i].size(); j++) {
			if (j == dir[i]) continue;
			if (mx < savdis[i][j]) mx = savdis[i][j], ddir[i] = j;
		}
		mx = 0;
		for (j = 0; j < adj[i].size(); j++) {
			if (j == dir[i] || j == ddir[i]) continue;
			if (mx < savdis[i][j]) mx = savdis[i][j], dddir[i] = j;
		}
		if (i != 1) {
			ll p = getind(adj[i], sp[i][0]);
			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);
		}
		else {
			ll dd;
			dd = ddir[1];
			if (dd == -1) arr[1] = depth[sav[1][dir[1]]];
			else arr[1] = depth[sav[1][dd]] + depth[sav[1][dir[1]]];
			update(1, arr[1]);
		}
	}
	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++;
			mp[c]++;
		}
	}
	getans(1);
	for (i = 1; i <= N; i++) cout << ans[i] << ln;
}

Compilation message

joi2019_ho_t5.cpp: In function 'void calc(ll, ll)':
joi2019_ho_t5.cpp:79:16: 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]
   79 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:97:17: 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]
   97 |   for (i = 0; i < adj[x].size(); i++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:104:17: 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]
  104 |   for (i = 0; i < adj[x].size(); i++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:110:16: 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]
  110 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void make_tree()':
joi2019_ho_t5.cpp:135:16: 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]
  135 |  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:211:6: warning: unused variable 'fardir' [-Wunused-variable]
  211 |   ll fardir = getfar(adj[x][i], getind(adj[adj[x][i]], x));
      |      ^~~~~~
joi2019_ho_t5.cpp:220:16: 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]
  220 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'int main()':
joi2019_ho_t5.cpp:295:17: 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]
  295 |   for (j = 0; j < adj[i].size(); j++) if (mx < savdis[i][j]) mx = savdis[i][j], dir[i] = j;
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:297:17: 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]
  297 |   for (j = 0; j < adj[i].size(); j++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:302:17: 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]
  302 |   for (j = 0; j < adj[i].size(); j++) {
      |               ~~^~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 19276 KB Output is correct
2 Correct 17 ms 20476 KB Output is correct
3 Correct 15 ms 19868 KB Output is correct
4 Correct 17 ms 20380 KB Output is correct
5 Correct 17 ms 20516 KB Output is correct
6 Correct 19 ms 20592 KB Output is correct
7 Correct 18 ms 20508 KB Output is correct
8 Correct 17 ms 20512 KB Output is correct
9 Correct 19 ms 20556 KB Output is correct
10 Correct 17 ms 20556 KB Output is correct
11 Correct 18 ms 20548 KB Output is correct
12 Correct 16 ms 20772 KB Output is correct
13 Correct 22 ms 20564 KB Output is correct
14 Correct 20 ms 20556 KB Output is correct
15 Correct 17 ms 20512 KB Output is correct
16 Correct 17 ms 20736 KB Output is correct
17 Correct 22 ms 20760 KB Output is correct
18 Correct 18 ms 20512 KB Output is correct
19 Correct 17 ms 20520 KB Output is correct
20 Correct 21 ms 20632 KB Output is correct
21 Correct 20 ms 20436 KB Output is correct
22 Correct 17 ms 20508 KB Output is correct
23 Correct 17 ms 20556 KB Output is correct
24 Correct 19 ms 20512 KB Output is correct
25 Correct 17 ms 20504 KB Output is correct
26 Correct 18 ms 20768 KB Output is correct
27 Correct 18 ms 20732 KB Output is correct
28 Correct 18 ms 20732 KB Output is correct
29 Correct 21 ms 20556 KB Output is correct
30 Correct 15 ms 20748 KB Output is correct
31 Correct 18 ms 20684 KB Output is correct
32 Correct 17 ms 20556 KB Output is correct

Subtask #2
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 781 ms 91800 KB Output is correct
2 Correct 1233 ms 95700 KB Output is correct
3 Correct 177 ms 36712 KB Output is correct
4 Correct 1320 ms 144196 KB Output is correct
5 Execution timed out 2069 ms 141400 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #3
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 989 ms 120676 KB Output is correct
2 Execution timed out 2067 ms 147080 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 19276 KB Output is correct
2 Correct 17 ms 20476 KB Output is correct
3 Correct 15 ms 19868 KB Output is correct
4 Correct 17 ms 20380 KB Output is correct
5 Correct 17 ms 20516 KB Output is correct
6 Correct 19 ms 20592 KB Output is correct
7 Correct 18 ms 20508 KB Output is correct
8 Correct 17 ms 20512 KB Output is correct
9 Correct 19 ms 20556 KB Output is correct
10 Correct 17 ms 20556 KB Output is correct
11 Correct 18 ms 20548 KB Output is correct
12 Correct 16 ms 20772 KB Output is correct
13 Correct 22 ms 20564 KB Output is correct
14 Correct 20 ms 20556 KB Output is correct
15 Correct 17 ms 20512 KB Output is correct
16 Correct 17 ms 20736 KB Output is correct
17 Correct 22 ms 20760 KB Output is correct
18 Correct 18 ms 20512 KB Output is correct
19 Correct 17 ms 20520 KB Output is correct
20 Correct 21 ms 20632 KB Output is correct
21 Correct 20 ms 20436 KB Output is correct
22 Correct 17 ms 20508 KB Output is correct
23 Correct 17 ms 20556 KB Output is correct
24 Correct 19 ms 20512 KB Output is correct
25 Correct 17 ms 20504 KB Output is correct
26 Correct 18 ms 20768 KB Output is correct
27 Correct 18 ms 20732 KB Output is correct
28 Correct 18 ms 20732 KB Output is correct
29 Correct 21 ms 20556 KB Output is correct
30 Correct 15 ms 20748 KB Output is correct
31 Correct 18 ms 20684 KB Output is correct
32 Correct 17 ms 20556 KB Output is correct
33 Correct 781 ms 91800 KB Output is correct
34 Correct 1233 ms 95700 KB Output is correct
35 Correct 177 ms 36712 KB Output is correct
36 Correct 1320 ms 144196 KB Output is correct
37 Execution timed out 2069 ms 141400 KB Time limit exceeded
38 Halted 0 ms 0 KB -