제출 #826830

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
826830		ttamx	드문 곤충 (IOI22_insects)	C++17	99.78 / 100	54 ms	432 KiB

insects

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

using namespace std;

int min_cardinality(int n){
	vector<int> permute(n);
	iota(permute.begin(),permute.end(),0);
	shuffle(permute.begin(),permute.end(),mt19937_64(time(nullptr)));
	auto movein=[&](int i){
		move_inside(permute[i]);
	};
	auto moveout=[&](int i){
		move_outside(permute[i]);
	};
	vector<int> single;
	for(int i=0;i<n;i++){
		movein(i);
		if(press_button()>1){
			moveout(i);
		}else{
			single.emplace_back(i);
		}
	}
	for(auto i:single)moveout(i);
	int k=single.size();
	vector<int> cur(n);
	iota(cur.begin(),cur.end(),0);
	int l=1,r=n/k;
	int cnt=0;
	while(l<r){
		int m=(l+r+1)/2;
		vector<int> vl,vr;
		for(auto i:cur){
			movein(i);
			if(press_button()>m){
				vr.emplace_back(i);
				moveout(i);
			}else{
				vl.emplace_back(i);
			}
		}
		if(vl.size()+cnt==k*m){
			l=m;
			cnt+=vl.size();
			cur=vr;
		}else{
			r=m-1;
			for(auto i:vl)moveout(i);
			cur=vl;
		}
	}
	return l;
}

컴파일 시 표준 에러 (stderr) 메시지

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:43:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |   if(vl.size()+cnt==k*m){
      |      ~~~~~~~~~~~~~^~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.78 / 75