Submission #667039

#	Time	Username	Problem	Language	Result	Execution time	Memory
667039		mychecksedad	Rarest Insects (IOI22_insects)	C++17	0 / 100	1 ms	420 KiB

insects

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
void move_inside(int i);
void move_outside(int i);
int press_button();


int min_cardinality(int n){
	set<int> v;
	for(int i = 0; i < n; ++i){
		v.insert(i);
		move_inside(i);
	}
	int ans = n;
	while(1){
		int k = press_button(), m = sqrt(v.size());
		vector<bool> in(n, 1);
		if(k == v.size()){
			ans = k;
			break;
		}else if(k >= m){
			int index = 0;
			for(int i: v){
				move_outside(i);
				in[i] = 0;
				int k1 = press_button();
				if(k1 != k){
					index = i;
					break;
				}
			}
			for(int x: v) if(in[x]) move_outside(x), in[x] = 0;
			move_inside(index);
			in[index] = 1;
			for(int i: v){
				if(i != index){
					move_inside(i);
					int k1 = press_button();
					if(k1 > 1){
						v.erase(i);
					}
					move_outside(i);
				}
			}
			v.erase(index);
		}else{
			for(int i: v){
				in[i] = 0;
				move_outside(i);
			}
			int group_num = 0;
			for(int i: v){
				move_inside(i);
				int k1 = press_button();
				in[i] = 1;
				if(k1 > 1){
					move_outside(i);
					in[i] = 0;
				}else group_num++;
			}
			for(int i: v) if(in[i] == 1) in[i] = 0, move_outside(i);
			vector<int> removed;
			for(int i: v){
				move_inside(i);
				int k1 = press_button();
				if(k1 == k){
					removed.pb(i);
					move_outside(i);
				}else in[i] = 1;
			}
			if(removed.size() == group_num){
				return k;
			}
			for(int i: removed) v.erase(i);
		}
		for(int x: v) if(!in[x]) move_inside(x);
	}
	return ans;
}	

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:19:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   if(k == v.size()){
      |      ~~^~~~~~~~~~~
insects.cpp:72:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   72 |    if(removed.size() == group_num){
      |       ~~~~~~~~~~~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75