Submission #1163090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1163090		boclobanchat	Combo (IOI18_combo)	C++20	100 / 100	8 ms	484 KiB

combo

#include"combo.h"
#include<bits/stdc++.h>
using namespace std;
int press(string p);
string guess_sequence(int N)
{
	string ans;
	char x,y,z;
	if(press("AB"))
	{
		if(press("A")) ans+='A',x='X',y='Y',z='B';
		else ans+='B',x='A',y='X',z='Y';
	}
	else
	{
		if(press("X")) ans+='X',x='A',y='B',z='Y';
		else ans+='Y',x='A',y='B',z='X';
	}
	if(N==1) return ans;
	for(int i=2;i<N;i++)
	{
		string a;
		a+=ans,a+=x,a+=x,a+=ans,a+=x,a+=y,a+=ans,a+=x,a+=z,a+=ans,a+=y;
		int res=press(a);
		if(res==i+1) ans+=x;
		else if(res==i) ans+=y;
		else ans+=z;
	}
	if(press(ans+x)==N) ans+=x;
	else if(press(ans+y)==N) ans+=y;
	else ans+=z;
	return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95