Submission #798994

#	Time	Username	Problem	Language	Result	Execution time	Memory
798994		LIF	Rarest Insects (IOI22_insects)	C++17	37.86 / 100	157 ms	424 KiB

insects

#include "insects.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;
bool vis[300005];
bool can[300005];
int k = 0;
bool check(int now,int N)
{
	//if(now == 1)return true;
	vector<int> vv;
	for(int i=0;i<=N-1;i++)
	{
		move_inside(i);
		if(press_button() > now+1)
		{
			move_outside(i);
			vv.push_back(i);
		}
	}
	for(int i=0;i<=N-1;i++)move_outside(i);
	if(N-vv.size() < (now+1) * k)return true;
	return false;
}
int min_cardinality(int 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:22:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |  if(N-vv.size() < (now+1) * k)return true;
      |     ~~~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 12.86 / 75