Submission #961171

#	Time	Username	Problem	Language	Result	Execution time	Memory
961171		raspy	Combo (IOI18_combo)	C++14	100 / 100	15 ms	1956 KiB

combo

#include "combo.h"
#include <iostream>

using namespace std;

string guess_sequence(int n)
{
	char a[5] = {'A', 'B', 'X', 'Y'};
	string p = "A";
	string s = "";
	{
		p = "AB";
		int odg = press(p);
		if (odg)
		{
			p = "A";
			if (press(p))
			{
				s = "A";
				swap(a[0], a[3]);
			}
			else
			{
				s = "B";
				swap(a[1], a[3]);
			}
		}
		else
		{
			p = "X";
			if (press(p))
			{
				s = "X";
				swap(a[2], a[3]);
			}
			else
				s = "Y";
		}
	}
	for (int tr = 2; tr < n; tr++)
	{
		p = "";
		p = s + a[0];
		p = p + s+a[1]+a[0];
		p = p + s+a[1]+a[2];
		p = p + s+a[1]+a[1];
		// cout << p << " " << p.size() << "\n";
		int odg = press(p);
		if (odg == tr)
			s += a[0];
		else if (odg == tr+1)
			s += a[1];
		else if (odg == tr-1)
			s += a[2];
	}
	p = "";
	if (s.size() < n)
	{
		p = s+a[0];
		int odg = press(p);
		if (odg == n)
			return p;
		p = s+a[1];
		odg = press(p);
		if (odg == n)
			return p;
		p = s+a[2];
		return p;
	}
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:57:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   57 |  if (s.size() < n)
      |      ~~~~~~~~~^~~

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