Submission #1078170

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078170		Muhammad_Aneeq	Rarest Insects (IOI22_insects)	C++17	92.99 / 100	64 ms	852 KiB

insects

void move_inside(int i);
void move_outside(int i);
int press_button();
#include <iostream>
#include <vector>
#include <map>
#include <set>
using namespace std;
set<int>ind;
int min_cardinality(int N)
{
	int colors=0;
	for (int i=0;i<N;i++)
	{
		move_inside(i);
		ind.insert(i);
		if (press_button()==2)
		{
			move_outside(i);
			ind.erase(i);
		}
		else
			colors++;
	}
	set<int>ni;
	for (int i=0;i<N;i++)
		if (ind.find(i)==ind.end())
			ni.insert(i);
	if (colors==1)
		return N;
	int st=1,en=N/colors+1;
	while (st+1<en)
	{
		int mid=(st+en)/2;
		for (auto i:ni)
		{
			if (ind.size()==colors*mid)
				break;
			move_inside(i);
			ind.insert(i);
			if (press_button()>mid)
			{
				move_outside(i);
				ind.erase(i);
			}
		}
		if (ind.size()==mid*colors)
		{
			for (auto i:ind)
				ni.erase(i);
			st=mid;
		}
		else
		{
			en=mid;
			ni.clear();
			for (auto i:ind)
			{
				ni.insert(i);
				move_outside(i);
			}
			ind.clear();
		}
	}
	return st;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:37:18: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |    if (ind.size()==colors*mid)
      |        ~~~~~~~~~~^~~~~~~~~~~~
insects.cpp:47:17: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   47 |   if (ind.size()==mid*colors)
      |       ~~~~~~~~~~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 67.99 / 75