Submission #951849

#	Time	Username	Problem	Language	Result	Execution time	Memory
951849		karpatka	Combo (IOI18_combo)	C++17	100 / 100	12 ms	1908 KiB

combo

#include "combo.h"

std::string guess_sequence(int N) {
	std::string s;

	char a, b, c, d;
	if (press("AB") > 0) {
		c = 'X', d = 'Y';
		if (press("A")) {
			a = 'A';
			b = 'B';
		} else {
			a = 'B';
			b = 'A';
		}
	} else {
		c = 'A', d = 'B';
		if (press("X")) {
			a = 'X';
			b = 'Y';
		} else {
			a = 'Y';
			b = 'X';
		}
	}

	s += a;
	if (N == 1) {
		return s;
	}

	for (int i = 1; i < N - 1; i++) {
		int k = press(s + b + b + s + b + c + s + b + d + s + c);
		if (k == i) {
			s += d;
		} else if (k == i + 1) {
			s += c;
		} else if (k == i + 2) {
			s += b;
		}
	}
	if (press(s + b) == N) {
		s += b;
	} else if (press(s + c) == N) {
		s += c;
	} else {
		s += d;
	}
	return s;
}

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