Submission #309725

#	Time	Username	Problem	Language	Result	Execution time	Memory
309725		wildturtle	Combo (IOI18_combo)	C++14	100 / 100	39 ms	616 KiB

combo

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

std::string guess_sequence(int N) {
	string ans,s,s1;
	int a,n;
	n=N;
	if(press("AB")>=1) {
	  	if(press("A")==1) { ans="A"; s1="BXY"; }
	  	else { s1="AXY"; ans="B"; }
	}
	else if(press("X")==1) { ans="X"; s1="ABY"; }
	else { s1="ABX"; ans="Y"; }
	if(n==1) return ans;
	for(long long i=2;i<n;i++) {
		s=ans+s1[0]+ans+s1[1]+s1[0]+ans+s1[1]+s1[1]+ans+s1[1]+s1[2];
		a=press(s);
		if(a==i-1) ans+=s1[2];
		else if(a==i) ans+=s1[0];
		else ans+=s1[1];
	}
	s=ans+s1[0]+ans+s1[1];
	if(press(s)==n) {
		s=ans+s1[0];
		if(press(s)==n) ans=ans+s1[0];
		else ans=ans+s1[1];
	}
	else ans=ans+s1[2];
	return ans;
}

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