Submission #1079003

#	Time	Username	Problem	Language	Result	Execution time	Memory
1079003		Trumling	Counting Mushrooms (IOI20_mushrooms)	C++14	75.59 / 100	6 ms	600 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std; 

typedef long long ll;
#define pb push_back
#define F first
#define S second
#define enter cout<<'\n';
#define INF 99999999999999999
#define MOD 1000000007
#define all(x) x.begin(),x.end()

int count_mushrooms(int n) {

	if(n<220)
	{
	vector<int> m(3,0);
	ll c2=1;
	for(int i=1;i<n-1;i+=2)
	{
		m[0]=i;
		m[2]=i+1;
		int c1 = use_machine(m);
		c2+=2-c1;
	}
	if(n%2==0)
	{
		m.clear();
		m.assign(2,0);
		m[1]=n-1;
		int c1 = use_machine(m);
		if(!c1)
		c2++;
	}
	return c2;
	}
	
	vector<int>A,B;
	A.pb(0);
	int i;
	ll tf=1;
	ll a=use_machine({0,1});
	if(a==0)
	{
		A.pb(-1);
		A.pb(1);
	}
	else
	{
		tf=2;
		B.pb(1);
		a=use_machine({0,2});
		if(a==0)
		{
			A.pb(-1);
			A.pb(2);
		}
		else
		{
			B.pb(-1);
			B.pb(2);
			tf=3;
		}
	}

	for(i=((tf==1)?2:3);i<202;i+=2)
	{
		if(tf<=2)
			{
			ll ans=use_machine({0,i,A[2],i+1});

			if(ans<2)
			{
			A.pb(-1);
			A.pb(i);
			}
			else
			{
			if(B.size()!=0)
				B.pb(-1);
			B.pb(i);

			}

			if(A.size()==201 || B.size()==201)
				break;

			if(ans%2==0)
			{
			A.pb(-1);
			A.pb(i+1);
			}
			else
			{
			if(B.size()!=0)
				B.pb(-1);
			B.pb(i+1);
			}

			if(A.size()==201 || B.size()==201)
			{
				i++;
				break;
			}
			}
		else
			{
			ll ans=use_machine({1,i,2,i+1});

			if(ans>=2)
			{
			A.pb(-1);
			A.pb(i);
			}
			else
			{
			if(B.size()!=0)
				B.pb(-1);
			B.pb(i);

			}

			if(A.size()==201 || B.size()==201)
				break;

			if(ans%2)
			{
			A.pb(-1);
			A.pb(i+1);
			}
			else
			{
			if(B.size()!=0)
				B.pb(-1);
			B.pb(i+1);
			}

			if(A.size()==201 || B.size()==201)
			{
				i++;
				break;
			}

			}
	}
	ll counta=A.size()/2 + 1;
	i++;
	
	for(i=i;i<n;i+=100)
	{
	if(A.size()==201)
	{
		if(i+100<=n)
		{
		for(int j=0;j<100;j++)
			A[j*2+1]=i+j;
		
		ll ans=use_machine(A);
		counta+=100-ans/2;

		continue;

		}
		vector<int>p;
		int j;
		for(j=0;j<n-i;j++)
			{
				p.pb(A[j*2]);
				p.pb(i+j);
			}

		p.pb(A[j*2]);
		ll ans=use_machine(p);
		counta+=(n-i)-ans/2;

	}
	else
	{
		if(i+100<=n)
		{
		for(int j=0;j<100;j++)
			B[j*2+1]=i+j;
		
		ll ans=use_machine(B);
		counta+=ans/2;

		continue;
		}

		vector<int>p;
		int j;
		for(j=0;j<n-i;j++)
			{
				p.pb(B[j*2]);
				p.pb(i+j);
			}

		p.pb(B[j*2]);
		ll ans=use_machine(p);
		counta+=ans/2;
	}

	}
	return counta;

}

• Subtask 1: 75.5853 / 100