Submission #998636

#	Time	Username	Problem	Language	Result	Execution time	Memory
998636		toast12	Combo (IOI18_combo)	C++14	100 / 100	24 ms	1000 KiB

combo

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

string guess_sequence(int N) {
	string ans = "";
	string s = "AB";
	vector<char> poss;
	int x = press(s);
	if (x >= 1) {
		if (x == 2) {
			ans += 'A';
			poss = {'B', 'X', 'Y'};
		}
		else {
			s = "A";
			x = press(s);
			if (x) {
				ans += 'A';
				poss = {'B', 'X', 'Y'};
			}
			else {
				ans += 'B';
				poss = {'A', 'X', 'Y'};
			}
		}
	}
	else {
		s = "X";
		x = press(s);
		if (x) {
			ans += 'X';
			poss = {'A', 'B', 'Y'};
		}
		else {
			ans += 'Y';
			poss = {'A', 'B', 'X'};
		}
	}
	for (int i = 1; i < N-1; i++) {
		string s = ans+poss[0];
		s += ans+poss[1]+poss[0];
		s += ans+poss[1]+poss[1];
		s += ans+poss[1]+poss[2];
		x = press(s);
		if (x == (int)ans.size()+1)
			ans += poss[0];
		else if (x == (int)ans.size()+2)
			ans += poss[1];
		else
			ans += poss[2];
	}
	if (N >= 2) {
		string s = ans+poss[0];
		x = press(s);
		if (x == N)
			ans = s;
		else {
			s = ans+poss[1];
			x = press(s);
			if (x == N)
				ans = s;
			else
				ans += poss[2];
		}
	}
	return ans;
}

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