Submission #826836

#	Time	Username	Problem	Language	Result	Execution time	Memory
826836		ttamx	Rarest Insects (IOI22_insects)	C++17	100 / 100	51 ms	672 KiB

insects

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

using namespace std;

int min_cardinality(int n){
	vector<int> single;
	for(int i=0;i<n;i++){
		move_inside(i);
		if(press_button()>1){
			move_outside(i);
		}else{
			single.emplace_back(i);
		}
	}
	for(auto i:single)move_outside(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;
		shuffle(cur.begin(),cur.end(),mt19937_64(time(nullptr)));
		for(auto i:cur){
			if(vl.size()+cnt==k*m){
				vr.emplace_back(i);
				continue;
			}
			move_inside(i);
			if(press_button()>m){
				vr.emplace_back(i);
				move_outside(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)move_outside(i);
			cur=vl;
		}
	}
	return l;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:27:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   27 |    if(vl.size()+cnt==k*m){
      |       ~~~~~~~~~~~~~^~~~~
insects.cpp:39:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   39 |   if(vl.size()+cnt==k*m){
      |      ~~~~~~~~~~~~~^~~~~

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