Submission #597158

#	Time	Username	Problem	Language	Result	Execution time	Memory
597158		franfill	Combo (IOI18_combo)	C++17	100 / 100	33 ms	616 KiB

combo

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

std::string guess_sequence(int N) {
	string s;
	if (press("AB"))
		if (press("A")) s = "A";
		else s = "B";
	else
		if (press("X")) s = "X";
		else s = "Y";
	if (N == 1) return s;
		
	string temp = "ABXY";
	string pos = "";
	for (auto c : temp) if (c != s[0]) pos += c;

	for (int i = 1; i < N-1; i++)
	{
		int l = s.size();
		string q = s + pos[0];
		for (auto c : pos) q += s + pos[1] + c;
		int r = press(q);
		if (r == l+1) s += pos[0];
		else if (r == l+2) s += pos[1];
		else s += pos[2];
	}

	int i;
	for (i = 0; i < 2; i++)
		if (press(s + pos[i]) == N) break;
	return s + pos[i];
}

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