oj.uz

Submission #630399

# Submission time Handle Problem Language Result Execution time Memory
630399 2022-08-16T10:14:07 Z Arnch Mergers (JOI19_mergers) C++17
10 / 100
 354 ms 257704 KB 
// oooo
/*
 har chi delet mikhad bebar ~
 gitar o ba khodet nabar! ~
 ;Amoo_Hasan;
*/

#include<bits/stdc++.h>
//#pragma GCC optimize("O3,no-stack-protector,unroll-loops")
//#pragma GCC target("avx2,fma")

using namespace std;

typedef long long ll;
typedef long double ld;

#define Sz(x) int((x).size())
#define All(x) (x).begin(), (x).end()
#define wtf(x) cout<<#x <<" : " <<x <<endl
#define mak make_pair

//constexpr int PRI = 1000696969;
constexpr ll INF = 1e18, N = 3e6 + 10, MOD = 1e9 + 7, LOG = 20;

int n, k;
int s[N], sub[N], head[N], link[N], fin[N];
int par[N][LOG], h[N], st[N], fn[N], tim;
int sz[N], pv[N];
int ans, total;
int seg[N];
vector<int> vc[N], adj[N], nei[N];

void dfs(int x, int p = -1) {
	par[x][0] = p;
	for(int i = 1; i < LOG; i++) par[x][i] = par[par[x][i - 1]][i - 1];
	h[x] = h[p] + 1;
	sub[x] = 1;
	for(auto j : adj[x]) {
		if(j == p) continue;
		dfs(j, x);
		sub[x] += sub[j];
	}
}
void hld(int x, int p = -1, int hi = 0) {
	link[tim] = x;
	st[x] = tim++;
	head[x] = hi;

	int bz = -1;
	for(auto j : adj[x]) {
		if(j == p) continue;
		if(bz == -1 || sub[bz] < sub[j]) bz = j;
	}
	if(bz == -1) {
		fn[x] = tim;
		return;
	}

	hld(bz, x, hi);
	for(auto j : adj[x]) {
		if(j == p || j == bz) continue;
		hld(j, x, j);
	}
	fn[x] = tim;
}

int get_par(int x, int y) {
	for(int i = 0; i < LOG; i++)
		if((y >> i) & 1)
			x = par[x][i];
	return x;
}
int lca(int x, int y) {
	if(h[x] > h[y]) swap(x, y);
	y = get_par(y, h[y] - h[x]);
	if(x == y) return x;
	for(int i = LOG - 1; i >= 0; i--)
		if(par[x][i] != par[y][i])
			x = par[x][i], y = par[y][i];
	return par[x][0];
}

int find(int x) {
	if(pv[x] == x) return x;
	return pv[x] = find(pv[x]);
}
void merge(int x, int y) {
//	cout<<"^^" <<x <<' ' <<y <<endl;
	int X = find(x), Y = find(y);
	if(X == Y) return;
	if(sz[X] < sz[Y]) swap(X, Y);
	pv[Y] = X, sz[X] += sz[Y];
}

void build(int l = 0, int r = n, int v = 1) {
	seg[v] = -1;
	if(r - l < 2) {
		fin[link[l]] = v;
		return;
	}
	int mid = (l + r) >> 1;
	build(l, mid, 2 * v), build(mid, r, 2 * v + 1);
	total = max(total, v);
}
void upd(int s, int e, int val, int l = 0, int r = n, int v = 1) {
	if(r <= s || l >= e) return;
	if(l >= s && r <= e) {
		if(seg[v] == -1) seg[v] = val;
		else merge(seg[v], val);
		return;
	}
	int mid = (l + r) >> 1;
	upd(s, e, val, l, mid, 2 * v), upd(s, e, val, mid, r, 2 * v + 1);
}
void relax(int l = 0, int r = n, int v = 1) {
	if(r - l < 2) {
		if(seg[v] != -1) merge(seg[v], s[link[l]]);
		return;
	}
	int mid = (l + r) >> 1;
	if(seg[v] != -1) {
		if(seg[2 * v] == -1) seg[2 * v] = seg[v];
		else merge(seg[v], seg[2 * v]);

		if(seg[2 * v + 1] == -1) seg[2 * v + 1] = seg[v];
		else merge(seg[v], seg[2 * v + 1]);
	}
	relax(l, mid, 2 * v), relax(mid, r, 2 * v + 1);
}

bool cmp(int i, int j) {
	return st[i] < st[j];
}
void solve(int x) {
	vector<int> ver;
	for(auto i : vc[x]) ver.push_back(i);
	sort(All(ver), cmp);
	int sz = Sz(ver);
	for(int i = 1; i < sz; i++) {
		ver.push_back(lca(ver[i - 1], ver[i]));
	}
	sort(All(ver), cmp);
	ver.erase(unique(All(ver)), ver.end());

	stack<int> mt;
	mt.push(ver[0]);

	upd(st[ver[0]], st[ver[0]] + 1, x);
	for(int i = 1; i < Sz(ver); i++) {
		int v = ver[i];
		while(fn[mt.top()] < fn[v]) mt.pop();
		int p = mt.top();
		
		upd(st[v], st[v] + 1, x);
		//cout<<"^^" <<v <<' ' <<p <<endl;
		while(v != -1 && h[v] >= h[p]) {
			if(h[head[v]] < h[p]) break;
			upd(st[head[v]], st[v] + 1, x);
			v = par[head[v]][0];
		}
		if(h[v] >= h[p])
			upd(st[p], st[v] + 1, x);

		mt.push(v);
	}
}

/*void solve(int x) {
	vector<int> ver;
	for(auto i : vc[x]) ver.push_back(i);
	sort(All(ver), cmp);
	int sz = Sz(ver);
	for(int i = 1; i < sz; i++) {
		ver.push_back(lca(ver[i - 1], ver[i]));
	}
	sort(All(ver), cmp);
	ver.erase(unique(All(ver)), ver.end());

	stack<int> mt;
	mt.push(ver[0]);

	merge(s[ver[0]], x);
	for(int i = 1; i < Sz(ver); i++) {
		int v = ver[i];
		while(fn[mt.top()] < fn[v]) mt.pop();
		int p = mt.top();

		merge(x, s[v]);
		v = par[v][0];
		while(v != p) {
			merge(x, s[v]);
			v = par[v][0];
		}
		mt.push(v);
	}
}*/


int main() {
	ios :: sync_with_stdio(0), cin.tie(0); cout.tie(0);

	for(int i = 0; i < N; i++) sz[i] = 1, pv[i] = i;

	cin >>n >>k;
	for(int i = 0; i < n - 1; i++) {
		int u, v; cin >>u >>v;
		--u, --v;
		adj[u].push_back(v), adj[v].push_back(u);
	}
	dfs(0);
	hld(0);
		
	for(int i = 0; i < n; i++) {
		cin >>s[i];
	}
	
	build();

	for(int i = 0; i < n; i++) {
		--s[i], s[i] += total;
		vc[s[i]].push_back(i);
	}
	
	for(int i = total; i < total + k; i++) {
		solve(i);
	}
	
//	assert(0);

	relax();

	for(int i = 0; i < N; i++) pv[i] = find(pv[i]);

	for(int i = 0; i < n; i++) {
		int u = s[i];
		for(auto j : adj[i]) {
			int v = s[j];
			if(pv[u] == pv[v]) continue;
			nei[pv[u]].push_back(pv[v]);
			nei[pv[v]].push_back(pv[u]);
		}
	}

	for(int i = 0; i < N; i++) {
		nei[i].erase(unique(All(nei[i])), nei[i].end());
		if(Sz(nei[i]) == 1) ans++;
	}
	cout<<(ans + 1) / 2;

	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 235176 KB Output is correct
2 Correct 135 ms 235256 KB Output is correct
3 Correct 121 ms 235232 KB Output is correct
4 Correct 128 ms 235220 KB Output is correct
5 Correct 122 ms 235300 KB Output is correct
6 Correct 121 ms 235196 KB Output is correct
7 Correct 127 ms 235212 KB Output is correct
8 Correct 123 ms 235212 KB Output is correct
9 Correct 129 ms 235212 KB Output is correct
10 Correct 121 ms 235216 KB Output is correct
11 Correct 129 ms 235160 KB Output is correct
12 Correct 126 ms 235240 KB Output is correct
13 Correct 125 ms 235208 KB Output is correct
14 Correct 124 ms 235148 KB Output is correct
15 Correct 122 ms 235196 KB Output is correct
16 Correct 155 ms 235220 KB Output is correct
17 Correct 122 ms 235212 KB Output is correct
18 Correct 126 ms 235168 KB Output is correct
19 Correct 122 ms 235116 KB Output is correct
20 Correct 132 ms 235208 KB Output is correct
21 Correct 121 ms 235116 KB Output is correct
22 Correct 124 ms 235140 KB Output is correct
23 Correct 121 ms 235144 KB Output is correct
24 Correct 146 ms 235268 KB Output is correct

Subtask #2
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 235176 KB Output is correct
2 Correct 135 ms 235256 KB Output is correct
3 Correct 121 ms 235232 KB Output is correct
4 Correct 128 ms 235220 KB Output is correct
5 Correct 122 ms 235300 KB Output is correct
6 Correct 121 ms 235196 KB Output is correct
7 Correct 127 ms 235212 KB Output is correct
8 Correct 123 ms 235212 KB Output is correct
9 Correct 129 ms 235212 KB Output is correct
10 Correct 121 ms 235216 KB Output is correct
11 Correct 129 ms 235160 KB Output is correct
12 Correct 126 ms 235240 KB Output is correct
13 Correct 125 ms 235208 KB Output is correct
14 Correct 124 ms 235148 KB Output is correct
15 Correct 122 ms 235196 KB Output is correct
16 Correct 155 ms 235220 KB Output is correct
17 Correct 122 ms 235212 KB Output is correct
18 Correct 126 ms 235168 KB Output is correct
19 Correct 122 ms 235116 KB Output is correct
20 Correct 132 ms 235208 KB Output is correct
21 Correct 121 ms 235116 KB Output is correct
22 Correct 124 ms 235140 KB Output is correct
23 Correct 121 ms 235144 KB Output is correct
24 Correct 146 ms 235268 KB Output is correct
25 Correct 129 ms 235212 KB Output is correct
26 Incorrect 132 ms 235724 KB Output isn't correct
27 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 235176 KB Output is correct
2 Correct 135 ms 235256 KB Output is correct
3 Correct 121 ms 235232 KB Output is correct
4 Correct 128 ms 235220 KB Output is correct
5 Correct 122 ms 235300 KB Output is correct
6 Correct 121 ms 235196 KB Output is correct
7 Correct 127 ms 235212 KB Output is correct
8 Correct 123 ms 235212 KB Output is correct
9 Correct 129 ms 235212 KB Output is correct
10 Correct 121 ms 235216 KB Output is correct
11 Correct 129 ms 235160 KB Output is correct
12 Correct 126 ms 235240 KB Output is correct
13 Correct 125 ms 235208 KB Output is correct
14 Correct 124 ms 235148 KB Output is correct
15 Correct 122 ms 235196 KB Output is correct
16 Correct 155 ms 235220 KB Output is correct
17 Correct 122 ms 235212 KB Output is correct
18 Correct 126 ms 235168 KB Output is correct
19 Correct 122 ms 235116 KB Output is correct
20 Correct 132 ms 235208 KB Output is correct
21 Correct 121 ms 235116 KB Output is correct
22 Correct 124 ms 235140 KB Output is correct
23 Correct 121 ms 235144 KB Output is correct
24 Correct 146 ms 235268 KB Output is correct
25 Correct 127 ms 235212 KB Output is correct
26 Correct 280 ms 251380 KB Output is correct
27 Correct 354 ms 251008 KB Output is correct
28 Incorrect 131 ms 235664 KB Output isn't correct
29 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 246 ms 251260 KB Output is correct
2 Correct 238 ms 257704 KB Output is correct
3 Incorrect 133 ms 235724 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 235176 KB Output is correct
2 Correct 135 ms 235256 KB Output is correct
3 Correct 121 ms 235232 KB Output is correct
4 Correct 128 ms 235220 KB Output is correct
5 Correct 122 ms 235300 KB Output is correct
6 Correct 121 ms 235196 KB Output is correct
7 Correct 127 ms 235212 KB Output is correct
8 Correct 123 ms 235212 KB Output is correct
9 Correct 129 ms 235212 KB Output is correct
10 Correct 121 ms 235216 KB Output is correct
11 Correct 129 ms 235160 KB Output is correct
12 Correct 126 ms 235240 KB Output is correct
13 Correct 125 ms 235208 KB Output is correct
14 Correct 124 ms 235148 KB Output is correct
15 Correct 122 ms 235196 KB Output is correct
16 Correct 155 ms 235220 KB Output is correct
17 Correct 122 ms 235212 KB Output is correct
18 Correct 126 ms 235168 KB Output is correct
19 Correct 122 ms 235116 KB Output is correct
20 Correct 132 ms 235208 KB Output is correct
21 Correct 121 ms 235116 KB Output is correct
22 Correct 124 ms 235140 KB Output is correct
23 Correct 121 ms 235144 KB Output is correct
24 Correct 146 ms 235268 KB Output is correct
25 Correct 129 ms 235212 KB Output is correct
26 Incorrect 132 ms 235724 KB Output isn't correct
27 Halted 0 ms 0 KB -