Submission #628784

#	Time	Username	Problem	Language	Result	Execution time	Memory
628784		study	Rarest Insects (IOI22_insects)	C++17	10 / 100	349 ms	300 KiB

insects

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

int min_cardinality(int N) {
	vector<int> a(N);
	for (int i=0; i<N; ++i){
		a[i] = i;
	}
	random_shuffle(a.begin(),a.end());
	bitset<2000> inside;
	int nbElems = 0;
	for (int i=0; i<N; ++i){
		move_inside(a[i]);
		int maxFreq = press_button();
		if (maxFreq > 1) move_outside(a[i]);
		else{
			++nbElems;
			inside[a[i]] = true;
		}
	}
	if (nbElems == 1) return N;
	int in = nbElems, crt = 1;
	for (int iter=0; iter<N; ++iter){
		vector<int> idx;
		for (int i=0; i<N; ++i){
			if (!inside[a[i]]) idx.emplace_back(a[i]);
		}
		if (idx.empty()) return crt;
//		random_shuffle(idx.begin(),idx.end());
		for (int i=0; i<idx.size(); ++i){
			move_inside(idx[i]);
			if (press_button() == crt+1){
				in++;
				inside[idx[i]] = true;
			}
			else move_outside(idx[i]);
			if (in%nbElems == 0) ++crt;
		}
	}
	return crt;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   for (int i=0; i<idx.size(); ++i){
      |                 ~^~~~~~~~~~~

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