Submission #945568

#	Time	Username	Problem	Language	Result	Execution time	Memory
945568		Syrius	Combo (IOI18_combo)	C++14	100 / 100	14 ms	1824 KiB

combo

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

// #define int long long
#define pint pair < int , int >
#define ll long long
#define ff first
#define ss second
#define fast ios_base::sync_with_stdio(NULL); cin.tie(NULL)

const int inf = 1e9 + 9;
const int mxn = 2e5 + 2;
const int mod = 1e9 + 7;

// int press(string p) {}

string guess_sequence(int n) {

	int t1 = press("AB");
	int t2 = press("BX");

	char a , b , c , z;
	if (t1 == 0) {
		a = 'A';
		b = 'B';
		if (t2 == 0) {
			z = 'Y';
			c = 'X';
		} else {
			z = 'X';
			c = 'Y';
		}
	} else {
		c = 'Y';
		b = 'X';
		if (t2 == 0) {
			a = 'B';
			z = 'A';
		} else {
			a = 'A';
			z = 'B';
		}
	}

	string str;
	str = z;
	if (n == 1) return str;

	for (int i = 0; i < n-2; i++) {
		int t = press(str + a + str + b + a + str + b + b + str + b + c);
		int sz = str.size();

		if (t - sz == 0) str += c;
		if (t - sz == 1) str += a;
		if (t - sz == 2) str += b;
	}

	if (press(str + a) == n) str += a;
	else if (press(str + b) == n) str += b;
	else str += c;

	return str;
}

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