Submission #1266576

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266576		coderg	Team Coding (EGOI24_teamcoding)	C++20	19 / 100	78 ms	52000 KiB

Main

/* 02.09.2025 */
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define fastIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

signed main(){
    fastIO;
    int n,k;cin>>n>>k;
	vector<int> c(n);
	vector<vector<int>> adj(n);
	vector<int> tot(k);
	for (int i=0;i<n;++i) {
		cin >> c[i];
		tot[c[i]]++;
	}
	for (int i=1;i<n;++i) {
		int x;cin>>x;
		adj[x].push_back(i);
	}
	vector<bool> is_root(n);
	vector<vector<int>> col_adj(n);
	vector<int> depth(n), mx_depth(n);
	vector<unordered_map<int, int>> col_cnt(k);
	vector<vector<int>> diff_depths(k);
	auto dfs = [&](auto& dfs, int i, vector<int>& par) -> void {
		int v = par[c[i]];
		if (v == -1) {
			is_root[i] = true;
		} else {
			col_adj[v].push_back(i);
		}
		par[c[i]] = i;
		mx_depth[i] = depth[i];
		col_cnt[c[i]][depth[i]]++;
		diff_depths[c[i]].push_back(depth[i]);
		for (auto& u : adj[i]) {
			depth[u]=depth[i]+1;
			dfs(dfs, u, par);
			mx_depth[i] = max(mx_depth[i], mx_depth[u]);
		}
		par[c[i]]=v;
	};
	vector<int> par(k,-1);
	dfs(dfs,0,par);
	for (int i=0;i<k;++i) {
		auto& v=diff_depths[i];
		sort(begin(v), end(v));
		v.erase(unique(begin(v), end(v)), end(v));
	}
	vector<map<int, int>> cnts(n);
	map<int, int> current_col;
	int ans1=0,ans2=0;
	const int M=sqrt(n);
	auto dfs1=[&](auto& dfs1,int i) -> void {
		cnts[i][depth[i]]++;
		for (auto& u:adj[i]) {
			dfs1(dfs1,u);
			if (cnts[i].size()<cnts[u].size())swap(cnts[i], cnts[u]);
			for (auto& [d, cnt] : cnts[u]) {
				cnts[i][d]+=cnt;
			}
			cnts[u].clear();
		}
		current_col.clear();
		if (is_root[i] && tot[c[i]]<=M) {
			queue<int> q;
			q.push(i);
			while (q.size()) {
				int v = q.front();
				q.pop();
				current_col[depth[v]]++;
				for (auto& u : col_adj[v]) {
					q.push(u);
				}
			}
			int now1=0,now2=0;
			const int color=c[i];
			for (auto& d:diff_depths[color]) {
				if (cnts[i].count(d)) {
					int space=cnts[i][d];
					int get=min(space, col_cnt[color][d]);
					now1 =get;
					now2+=get-current_col[d];
				}
			}
			if (ans1<now1) {
				ans1=now1;
				ans2=now2;
			}
			if (ans1==now1) ans2=min(ans2,now2);
		}
	};
	dfs1(dfs1,0);
	vector<vector<int>> roots(k);
	auto dfs2 = [&](auto& dfs2, int i, vector<int>& cnt, vector<int>& cur_col_cnt, int d, const int need) -> void {
		while (d>=(int)cnt.size()) cnt.push_back(0);
		while (d>=(int)cur_col_cnt.size()) cur_col_cnt.push_back(0);
		cnt[d]++;
		if (c[i]==need) cur_col_cnt[d]++;
		for (auto& u : adj[i]) {
			dfs2(dfs2, u, cnt, cur_col_cnt, d+1, need);
		}
	};
	for (int i=0;i<n;++i) {
		if (is_root[i] && tot[c[i]] > M) {
			vector<int> cnt, cur_col_cnt;
			dfs2(dfs2, i, cnt, cur_col_cnt, 0, c[i]);
			cnt.push_back(0);
			int d = 0;
			int now1=0,now2=0;
			while (cnt[d]>0) {
				int true_d=d+depth[i];
				if (col_cnt[c[i]].count(true_d)) {
					int get=min(cnt[d], col_cnt[c[i]][true_d]);
					now1+=get;
					now2+=get-cur_col_cnt[d];
				}
				d++;
			}
			if (ans1<now1) {
				ans1=now1;
				ans2=now2;
			}
			if (ans1==now1) ans2=min(ans2,now2);
		}
	}
	cout<<ans1<<' '<<ans2<<'\n';
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 19 / 19
• Subtask 3: 0 / 27
• Subtask 4: 0 / 23
• Subtask 5: 0 / 19