Submission #167122

#	Time	Username	Problem	Language	Result	Execution time	Memory
167122		minseo852	Combo (IOI18_combo)	C++11	0 / 100	109 ms	200 KiB

combo

#include <combo.h>
#include <bits/stdc++.h>
#include <string>
#include <vector>
#include <iostream>

using namespace std;

int countchar[2000] = { 0 };

void countup()
{
	countchar[0] += 1;
	for (int i = 0; i < 1999; i++)
	{
		if (countchar[i] > 2)
		{
			countchar[i] = 0;
			countchar[i + 1] += 1;
			continue;
		}
		break;
	}
}

string guess_sequence(int N)
{
	string result;
	if (press("AB") >= 1)
	{
		result = (press("A") == 1 ? "A" : "B");
	}
	else
		result = (press("X") == 1 ? "X" : "Y");
	
	if (N == 1)
		return result;

	vector<string> others = { "A", "B", "X", "Y" };
	for (int i = 0; i < 4; i++)
	if (others[i] == result)
	{
		others.erase(others.begin() + i);
		break;
	}
	

	string check;
	int size_cnt = 0;

	int low, high, mid;

	while (true)
	{
		check.clear();
		for (int i = 0; i < 4; i++)
		{
			check += result;
			for (int j = 0; j < N-result.size(); j++)
			{
				check += others[countchar[j]];
			}
			countup();
		}

		if ((size_cnt = press(check)) > result.size())
		{
			low = 0;
			high = check.size() - 1;
			while (true)
			{
				mid = (low + high) / 2;
				if (press(check.substr(low, mid)) == size_cnt)
				{
					high = mid;
				}
				else
				{
					low = mid;
				}

				if (check.substr(low, high).size() == size_cnt)
				{
					result = check.substr(low, high);
					break;
				}
			}

			if (result.size() == N)
				break;
		}
	}


	return result;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |    for (int j = 0; j < N-result.size(); j++)
      |                    ~~^~~~~~~~~~~~~~~~~
combo.cpp:66:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |   if ((size_cnt = press(check)) > result.size())
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:82:40: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   82 |     if (check.substr(low, high).size() == size_cnt)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
combo.cpp:89:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   89 |    if (result.size() == N)
      |        ~~~~~~~~~~~~~~^~~~

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