Submission #1235722

#	Time	Username	Problem	Language	Result	Execution time	Memory
1235722		MuhammadSaram	Rarest Insects (IOI22_insects)	C++20	Compilation error	0 ms	0 KiB

insects

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

using namespace std;

#define get press_button

set<int> se;

void add(int u)
{
	if (se.count(u)) return;
	move_inside(u), se.insert(u);
}

void rem(int u)
{
	if (!se.count(u)) return;
	move_outside(u), se.erase(u);
}

int min_cardinality(int n)
{
	vector<int> v={0};
	add(0);
	for (int i=1;i<n;i++)
	{
		add(i), v.push_back(i);
		if (get()==2)
			rem(i),v.pop_back();
	}
	if (v.size()>250)
	{
		bool vis[n]={};
		int ans=0, t=v.size();
		while (1)
		{
			ans++;
			for (int i:v) vis[i]=1;
			while (!v.empty()) rem(v.back()), v.pop_back();
			for (int i=0;i<n;i++)
			{
				if (vis[i]) continue;
				add(i), v.push_back(i);
				if (get()==2) rem(i), v.pop_back();
			}
			if (v.size()<t) break;
		}
		return ans;
	}
	else
	{
		if (v[i].empty()) return 1/0;
		int l[n], r[n];
		vector<int> mid[n];
		for (int i=0;i<n;i++)
			if (!se.count(i))
				l[i]=-1, r[i]=(int)v.size()-1, mid[(l[i]+r[i])/2].push_back(i);
		for (int i=0;i<v.size();i++)
			l[v[i]]=i-1,r[v[i]]=i;
		for (int ct=0;ct<8;ct++)
		{
			bool it=0;
			for (int i=0;i<n;i++)
				if (l[i]+1<r[i]) it=1;
			if (!it) break;
			for (int i:v) rem(i);
			for (int i=0;i<v.size();i++)
			{
				add(v[i]);
				for (int x:mid[i])
				{
					add(x);
					if (get()==2) r[x]=i;
					else l[x]=i;
					rem(x);
					mid[(l[x]+r[x])/2].push_back(x);
				}
				mid[i].clear();
			}
		}
		map<int,int> cnt;
		for (int i=0;i<n;i++)
			cnt[r[i]]++;
		int ans=n;
		for (auto [i,x]:cnt) ans=min(ans,x);
		return ans;
	}
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:53:23: error: 'i' was not declared in this scope
   53 |                 if (v[i].empty()) return 1/0;
      |                       ^
insects.cpp:53:43: warning: division by zero [-Wdiv-by-zero]
   53 |                 if (v[i].empty()) return 1/0;
      |                                          ~^~