Submission #862861

#	Time	Username	Problem	Language	Result	Execution time	Memory
862861		20163070	Combo (IOI18_combo)	C++14	100 / 100	13 ms	1800 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
 
std::string guess_sequence(int n) {
	string ans,s;
 	if(press("AB"))
 	{
 		if(press("A")) ans="A",s="BXY";
 		else ans="B",s="AXY";
	}
	else
	{
		if(press("X")) ans+="X",s="ABY";
		else ans+="Y",s="ABX";
	}
	if(n==1) return ans;
	for(int i=2;i<n;i++)
	{
		string t=ans+s[0]+ans+s[1]+s[0]+ans+s[1]+s[1]+ans+s[1]+s[2];
		int get=press(t);
		if(get==i-1) ans+=s[2];
		else if(get==i) ans+=s[0];
		else ans+=s[1];
	}
	if(press(ans+s[0])==n) ans+=s[0];
	else if(press(ans+s[1])==n) ans+=s[1];
	else ans+=s[2];
	return ans;
}

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