Submission #799745

#	Time	Username	Problem	Language	Result	Execution time	Memory
799745		LIF	Rarest Insects (IOI22_insects)	C++17	83.21 / 100	81 ms	436 KiB

insects

#include "insects.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;
bool vis[300005];
bool can[300005];
int k = 0;
vector<int> vv2;
bool rub[300005];
vector<int> vv1;
int nown;
bool ys[300005];
bool check(int now,int N)
{
	//if(now == 1)return true;
	vector<int> vv;
	for(int i=0;i<=N-1;i++)vis[i] = false;
	for(int i=0;i<=N-1;i++)
	{
		if(rub[i] == false && ys[i] == false)
		{
			move_inside(i);
			ys[i] = true;
			if(press_button() > now+1)
			{
				move_outside(i);
				vv.push_back(i);
				vis[i] = true;
				ys[i] = false;
			}
		}
		
	}
/*	cout<<"now: "<<now<<endl;
	cout<<"nown: "<<nown<<endl;
	cout<<"nown-vv.size(): "<<N-vv.size()<<" "<<(now+1) * k<<endl;
	cout<<"vv[i] ";
	for(int i=0;i<vv.size();i++)cout<<vv[i]<<" ";
	cout<<endl;*/
	if(nown-vv.size() < (now+1) * k)
	{
		for(int i=0;i<vv.size();i++)rub[vv[i]] = true;
		for(int i=0;i<=N-1;i++)
		{
			if(vis[i] == false && rub[i] == false)
			{
				move_outside(i);
				ys[i] = false;
			}
		}
		nown -= vv.size();
		return true;
	}
	else
	{
		return false;
	}
	
	
}
int min_cardinality(int N) {
	nown = N;
	int l = 1;
	vector<int> cnt;
	for(int i=0;i<=N-1;i++)
	{
		move_inside(i);
		if(press_button() >= 2)move_outside(i);
		else cnt.push_back(i);
	}
	for(int i=0;i<=N-1;i++)move_outside(i);
	k = cnt.size();
	int r = (N+k-1)/k;
	int ans = (N+k-1)/k;
	while(l <= r)
	{
		int mid = (l+r)>>1;
		if(check(mid,N) == true)
		{
			r = mid-1;
			ans = mid;
		}
		else l = mid+1;
	}
  	return ans;
}

Compilation message (stderr)

insects.cpp: In function 'bool check(int, int)':
insects.cpp:40:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |  if(nown-vv.size() < (now+1) * k)
      |     ~~~~~~~~~~~~~~~^~~~~~~~~~~~~
insects.cpp:42:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   for(int i=0;i<vv.size();i++)rub[vv[i]] = true;
      |               ~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 58.21 / 75