Submission #140777

#	Time	Username	Problem	Language	Result	Execution time	Memory
140777		caoash	Combo (IOI18_combo)	C++14	100 / 100	45 ms	536 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(int N) {
	int x;
	string s;
	char ch[4]= {'A', 'B', 'X', 'Y'};
	if (press("AB") >= 1) x = press("A") != 1;
	else x = 2 + (press("X") < 1);
	s += ch[x];
	if (N == 1) return s;
	swap(ch[x], ch[3]);
	for (int i = 1; i < N - 1; i++) {
		x = press(s + ch[0] + ch[0] + s + ch[0] + ch[1] + s + ch[0] + ch[2] + s + ch[1]);
		if (x == i + 2) s+=ch[0];
		else if (x == i + 1) s+=ch[1];
		else s += ch[2];
	}
	if (press(s + ch[0] + s + ch[1]) == N) {
		if (press(s + ch[0]) == N) s += ch[0];
		else s += ch[1];
	} else s += ch[2];
	return s;
}

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