Submission #945376

#	Time	Username	Problem	Language	Result	Execution time	Memory
945376		Syrius	Combo (IOI18_combo)	C++14	5 / 100	1 ms	344 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;

	for (int i = 0; i < n-2; i++) {
		int t = press(str + a + str + b + a + str + b + b + str + b + c);
		if (t - str.size() == 0) str += c;
		if (t - str.size() == 1) str += a;
		if (t - str.size() == 2) str += b;
	}

	int q = press(str + a);
	if (q == n) str += a;
	if (q == n-1) {
		if (press(str + b) == n) str += b;
		else str += c;
	}

	if (str.size() != n) press(str + 'F');
	return str;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:63:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   63 |  if (str.size() != n) press(str + 'F');
      |      ~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95