Submission #835023

#	Time	Username	Problem	Language	Result	Execution time	Memory
835023		pavement	Rarest Insects (IOI22_insects)	C++17	0 / 100	1 ms	208 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

vector<int> cur_v, perm;

int qry(vector<int> v) {
	sort(v.begin(), v.end());
	vector<int> chng;
	set_symmetric_difference(v.begin(), v.end(), cur_v.begin(), cur_v.end(), back_inserter(chng));
	for (int i : chng) {
		if (binary_search(v.begin(), v.end(), i)) {
			move_inside(perm[i]);
		} else {
			move_outside(perm[i]);
		}
	}
	cur_v = v;
	return press_button();
}

mt19937 rng(998244353);

int min_cardinality(int N) {
	perm.resize(N);
	iota(perm.begin(), perm.end(), 0);
	shuffle(perm.begin(), perm.end(), rng);
	vector<int> rep, cnt(N, 0);
	for (int i = 0; i < N; i++) {
		int lnk = -1;
		{
			shuffle(rep.begin(), rep.end(), rng);
			int lo = 0, hi = (int)rep.size() - 1;
			while (lo <= hi) {
				int mid = (lo + hi) / 2;
				vector<int> cur = {i};
				for (int j = 0; j <= mid; j++) {
					cur.pb(rep[j]);
				}
				if (qry(cur) > 1) {
					lnk = rep[mid];
					hi = mid - 1;
				} else {
					lo = mid + 1;
				}
			}
		}
		if (lnk == -1) {
			cnt[i]++;
		} else {
			cnt[lnk]++;
			rep.erase(find(rep.begin(), rep.end(), lnk));
		}
		rep.pb(i);
	}
	int ret = N;
	for (int i = 0; i < N; i++) {
		if (cnt[i]) {
			ret = min(ret, cnt[i]);
		}
	}
	return ret;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75