Submission #109003

#	Time	Username	Problem	Language	Result	Execution time	Memory
109003		davitmarg	Combo (IOI18_combo)	C++17	100 / 100	67 ms	628 KiB

combo

/*
DEATH-MATCH
Davit-Marg
*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <iterator>
#include <ctype.h>
#include "combo.h"
#define mod 1000000007
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
using namespace std;
//
//int press(string p)
//{
//	int ans;
//	cout << p << endl;
//	cin >> ans;
//	return ans;
//}

string guess_sequence(int N)
{
	string s[4] = {"A","B","X","Y"},ans,query;
	
	if (press("AB")>=1)
	{
		if (press("A") == 1)
			ans = "A";
		else
		{
			ans = "B";
			swap(s[0],s[1]);
		}
	}
	else
	{
		if (press("X") == 1)
		{
			ans = "X";
			swap(s[0], s[2]);
		}
		else
		{
			ans = "Y";
			swap(s[0], s[3]);
		}
	}


	while (ans.length() < N - 1)
	{
		query = ans + s[1];
		for (int i = 1; i < 4; i++)
			query += ans + s[2] + s[i];

		int p = press(query);

		if (p == ans.length() + 2)
			ans += s[2];
		else if(p==ans.length()+1)
			ans += s[1];
		else
			ans += s[3];
	}



	while (ans.length() < N)
	{
		if (press(ans + s[1] + ans + s[2]) == ans.length() + 1)
		{
			if (press(ans + s[1]) == ans.length() + 1)
				ans += s[1];
			else
				ans += s[2];
		}
		else
		{
			ans += s[3];
		}
	}
	return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:62:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   62 |  while (ans.length() < N - 1)
      |         ~~~~~~~~~~~~~^~~~~~~
combo.cpp:70:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   if (p == ans.length() + 2)
      |       ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:72:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |   else if(p==ans.length()+1)
      |           ~^~~~~~~~~~~~~~~~
combo.cpp:80:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   80 |  while (ans.length() < N)
      |         ~~~~~~~~~~~~~^~~
combo.cpp:82:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |   if (press(ans + s[1] + ans + s[2]) == ans.length() + 1)
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
combo.cpp:84:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |    if (press(ans + s[1]) == ans.length() + 1)
      |        ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

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