Submission #441775

#	Time	Username	Problem	Language	Result	Execution time	Memory
441775		8e7	Inside information (BOI21_servers)	C++17	100 / 100	598 ms	31172 KiB

servers

//Challenge: Accepted
#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <queue>
#include <set>
#include <assert.h>
//#include <ext/pb_ds/assoc_contatiner.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;
void debug() {cout << endl;}
template<class T, class ... U> void debug(T a, U ... b) { cout << a << " ";debug(b...);}
template<class T> void pary (T l, T r) {
	while (l != r) cout << (*l) << " ", l++;
	cout << endl;
}
#define ll long long
#define maxn 120005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
vector<pii> adj[maxn];
struct query{
	int ti, id, to;
	query() {ti = 0, id = 0, to = 0;}
	query(int x, int y, int z) {ti = x, id = y, to = z;}
};
vector<query> que[maxn];
int qtype[maxn], ans[maxn];

struct BIT{
	int bit[maxn];
	void modify(int ind, int val) {
		for (;ind < maxn;ind += ind & (-ind)) bit[ind] += val;
	}
	int query(int ind) {
		int ret = 0;
		for (;ind > 0;ind -= ind & (-ind)) ret += bit[ind];
		return ret;
	}
} bit;
int siz[maxn];
bool mark[maxn];
int found[maxn];

void dfs(int n, int par) {
	siz[n] = 1;
	for (auto v:adj[n]) {
		if (v.ff != par && mark[v.ff]) {
			dfs(v.ff, n);
			siz[n] += siz[v.ff];
		}
	}
}
int get_centroid(int n, int par, int tot) {
	for (auto v:adj[n]) {
		if (v.ff != par && mark[v.ff]) {
			if (2 * siz[v.ff] >= tot) return get_centroid(v.ff, n, tot);
		}
	}	
	return n;
}

void get_node(int n, int par, int w, vector<pii> & ret, int dir) {
	ret.push_back({n, w});
	for (auto v:adj[n]) {
		if (v.ff != par && mark[v.ff] && (dir == 2 ? true : (dir ? v.ss > w : v.ss < w))) {
			get_node(v.ff, n, v.ss, ret, dir);
		}
	}
}
void recur(int n, int par, vector<int> & ret) {
	ret.push_back(n);
	for (auto v:adj[n]) {
		if (v.ff != par && mark[v.ff]) {
			recur(v.ff, n, ret);
		}
	}
}
void solve(vector<int> a) {
	//debug(49);
	//pary(a.begin(), a.end());
	for (int i:a) mark[i] = 1;
	dfs(a[0], 0);	
	vector<pii> op;
	int cent = get_centroid(a[0], 0, a.size());
	sort(adj[cent].begin(), adj[cent].end(), [&](pii x, pii y) {return x.ss > y.ss;});	
	for (auto v:adj[cent]) {
		if (!mark[v.ff]) continue;
		vector<pii> se;
		get_node(v.ff, cent, v.ss, se, 0);
		for (auto node:se) {
			//debug(7122, node.ff);
			for (auto q:que[node.ff]) {
				if (q.to == 0) {
					ans[q.id] += bit.query(q.ti) + (v.ss <= q.ti ? 1 : 0);	
				} else if (mark[q.to]) {
					if (q.to != cent) ans[q.id] = (found[q.to] && found[q.to] <= q.ti);	
					else ans[q.id] = v.ss <= q.ti;
				}
			}
		}
		se.clear();
		get_node(v.ff, cent, v.ss, se, 1);
		for (auto node:se) {
			//debug(2217, node.ff);
			found[node.ff] = node.ss;
			bit.modify(node.ss, 1);
		}
		op.insert(op.end(), se.begin(), se.end());
	}
	for (auto q:que[cent]) {
		if (q.to == 0) {
			ans[q.id] += 1 + bit.query(q.ti);
		} else if (mark[q.to]){
			if (q.to == cent) ans[q.id] = 1;
			else ans[q.id] = found[q.to] && found[q.to] <= q.ti;
		}
	}
	for (auto i:op) {
		found[i.ff] = 0;
		bit.modify(i.ss, -1);
	}
	vector<vector<int> > rec;
	for (auto v:adj[cent]) {
		if (!mark[v.ff]) continue;
		vector<int> add;
		recur(v.ff, cent, add);
		rec.push_back(add);	
	}
	for (int i:a) mark[i] = 0;
	for (auto i:rec) solve(i);
}
int main() {
	io
	int n, k;
	cin >> n >> k;
	int cur = 1, qcnt = 0;
	for (int i = 1;i <= n;i++) mark[i] = 1;
	for (int i = 0;i < n + k - 1;i++) {
		char type;
		cin >> type;
		if (type == 'S') {
			int a, b;
			cin >> a >> b;
			adj[a].push_back({b, cur});
			adj[b].push_back({a, cur});
			cur++;
		} else if (type == 'Q') {
			int a, b;
			cin >> a >> b;
			qtype[qcnt] = 0;
			que[b].push_back(query(cur - 1, qcnt++, a));
		} else {
			int d;
			cin >> d;
			qtype[qcnt] = 1;
			que[d].push_back(query(cur - 1, qcnt++, 0));
		}
	}
	vector<int> st;
	for (int i = 1;i <= n;i++) st.push_back(i);
	solve(st);
	
	for (int i = 0;i < k;i++) {
		if (qtype[i]) cout << ans[i] << "\n";
		else cout << (ans[i] ? "yes" : "no") << "\n";
	}
}
/*
6 9
S 1 2
S 1 3
S 3 4
Q 5 1
S 4 5
S 1 6
C 3
Q 5 1
C 6
Q 1 5
C 1
C 2
C 4
C 5

7 7
S 4 5
S 2 3
S 5 6
S 6 7
S 3 4
S 1 2
C 1
C 2
C 3
C 4
C 5
C 6
C 7
   */

• Subtask 1: 2.5 / 2.5
• Subtask 2: 2.5 / 2.5
• Subtask 3: 2.5 / 2.5
• Subtask 4: 2.5 / 2.5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 12.5 / 12.5
• Subtask 10: 12.5 / 12.5
• Subtask 11: 17.5 / 17.5
• Subtask 12: 17.5 / 17.5