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답안 #405645

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
405645 2021-05-16T15:57:08 Z flappybird Unique Cities (JOI19_ho_t5) C++14
4 / 100
 2000 ms 153688 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 << 1) + 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 prtind[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; sp[x][i - 1]; 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];
}
//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], prtind[adj[x][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 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 = 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);
		}
		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++;
	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:70:11: 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:208:16: 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]
  208 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:209:6: warning: unused variable 'fardir' [-Wunused-variable]
  209 |   ll fardir = getfar(adj[x][i], prtind[adj[x][i]]);
      |      ^~~~~~
joi2019_ho_t5.cpp:218:16: 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]
  218 |  for (i = 0; i < adj[x].size(); i++) {
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'void calcp(ll, ll, ll)':
joi2019_ho_t5.cpp:271:16: 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]
  271 |  for (i = 0; i < adj[x].size(); i++) if (adj[x][i] != p) calcp(adj[x][i], x, i);
      |              ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp: In function 'int main()':
joi2019_ho_t5.cpp:294:17: 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]
  294 |   for (j = 0; j < adj[i].size(); j++) if (mx < savdis[i][j]) mx = savdis[i][j], dir[i] = j;
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:296:17: 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]
  296 |   for (j = 0; j < adj[i].size(); j++) {
      |               ~~^~~~~~~~~~~~~~~
joi2019_ho_t5.cpp:301:17: 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]
  301 |   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 19988 KB Output is correct
4 Correct 17 ms 20340 KB Output is correct
5 Correct 17 ms 20556 KB Output is correct
6 Correct 22 ms 20684 KB Output is correct
7 Correct 20 ms 20512 KB Output is correct
8 Correct 17 ms 20532 KB Output is correct
9 Correct 17 ms 20556 KB Output is correct
10 Correct 17 ms 20560 KB Output is correct
11 Correct 17 ms 20556 KB Output is correct
12 Correct 15 ms 20768 KB Output is correct
13 Correct 19 ms 20556 KB Output is correct
14 Correct 18 ms 20580 KB Output is correct
15 Correct 17 ms 20556 KB Output is correct
16 Correct 15 ms 20788 KB Output is correct
17 Correct 18 ms 20812 KB Output is correct
18 Correct 18 ms 20500 KB Output is correct
19 Correct 18 ms 20524 KB Output is correct
20 Correct 20 ms 20768 KB Output is correct
21 Correct 25 ms 20556 KB Output is correct
22 Correct 18 ms 20536 KB Output is correct
23 Correct 20 ms 20616 KB Output is correct
24 Correct 19 ms 20576 KB Output is correct
25 Correct 18 ms 20548 KB Output is correct
26 Correct 17 ms 20796 KB Output is correct
27 Correct 19 ms 20676 KB Output is correct
28 Correct 19 ms 20684 KB Output is correct
29 Correct 18 ms 20580 KB Output is correct
30 Correct 16 ms 20832 KB Output is correct
31 Correct 19 ms 20684 KB Output is correct
32 Correct 21 ms 20556 KB Output is correct

Subtask #2
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 677 ms 93092 KB Output is correct
2 Correct 1119 ms 97088 KB Output is correct
3 Correct 152 ms 37008 KB Output is correct
4 Correct 1196 ms 146940 KB Output is correct
5 Execution timed out 2080 ms 146716 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #3
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 983 ms 122652 KB Output is correct
2 Execution timed out 2088 ms 153688 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 19988 KB Output is correct
4 Correct 17 ms 20340 KB Output is correct
5 Correct 17 ms 20556 KB Output is correct
6 Correct 22 ms 20684 KB Output is correct
7 Correct 20 ms 20512 KB Output is correct
8 Correct 17 ms 20532 KB Output is correct
9 Correct 17 ms 20556 KB Output is correct
10 Correct 17 ms 20560 KB Output is correct
11 Correct 17 ms 20556 KB Output is correct
12 Correct 15 ms 20768 KB Output is correct
13 Correct 19 ms 20556 KB Output is correct
14 Correct 18 ms 20580 KB Output is correct
15 Correct 17 ms 20556 KB Output is correct
16 Correct 15 ms 20788 KB Output is correct
17 Correct 18 ms 20812 KB Output is correct
18 Correct 18 ms 20500 KB Output is correct
19 Correct 18 ms 20524 KB Output is correct
20 Correct 20 ms 20768 KB Output is correct
21 Correct 25 ms 20556 KB Output is correct
22 Correct 18 ms 20536 KB Output is correct
23 Correct 20 ms 20616 KB Output is correct
24 Correct 19 ms 20576 KB Output is correct
25 Correct 18 ms 20548 KB Output is correct
26 Correct 17 ms 20796 KB Output is correct
27 Correct 19 ms 20676 KB Output is correct
28 Correct 19 ms 20684 KB Output is correct
29 Correct 18 ms 20580 KB Output is correct
30 Correct 16 ms 20832 KB Output is correct
31 Correct 19 ms 20684 KB Output is correct
32 Correct 21 ms 20556 KB Output is correct
33 Correct 677 ms 93092 KB Output is correct
34 Correct 1119 ms 97088 KB Output is correct
35 Correct 152 ms 37008 KB Output is correct
36 Correct 1196 ms 146940 KB Output is correct
37 Execution timed out 2080 ms 146716 KB Time limit exceeded
38 Halted 0 ms 0 KB -