Submission #1029072

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029072		42kangaroo	Rarest Insects (IOI22_insects)	C++17	99.79 / 100	44 ms	1028 KiB

insects

#include "insects.h"
#include "bits/stdc++.h"

using namespace std;

int min_cardinality(int N) {
	set<int> inside, outside;
	for (int i = 0; i < N; ++i) {
		move_inside(i);
		if (press_button() > 1) {
			outside.insert(i);
			move_outside(i);
		} else {
			inside.insert(i);
		}
	}
	int k = inside.size();
	int l = 1, r = N/k + 1;
	while (l + 1 < r) {
		int m = (l + r + 1)/2;
		set<int> nIn, nOut;
		for (auto e: outside) {
			move_inside(e);
			if (press_button() > m) {
				nOut.insert(e);
				move_outside(e);
			} else nIn.insert(e);
		}
		if ((inside.size() + nIn.size()) == m*k) {
			l = m;
			outside = nOut;
			inside.insert(nIn.begin(), nIn.end());
		} else {
			r = m;
			for (auto e: nIn) {
				move_outside(e);
			}
			outside = nIn;
		}
	}
	return l;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:29:36: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |   if ((inside.size() + nIn.size()) == m*k) {
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.79 / 75