Submission #218850

#	Time	Username	Problem	Language	Result	Execution time	Memory
218850		Lawliet	Xoractive (IZhO19_xoractive)	C++14	6 / 100	10 ms	384 KiB

Xoractive

#include "interactive.h"
#include <bits/stdc++.h>

using namespace std;
typedef pair<int,int> pii;

const int MAXN = 110;

int N;

int v[MAXN];

/*int ask(int i) { return v[i]; }

vector<int> get_pairwise_xor(vector<int> a)
{
	vector< int > ans;

	for(int i = 0 ; i < a.size() ; i++)
		for(int j = 0 ; j < a.size() ; j++)
			ans.push_back( v[i]^v[j] );

	sort( ans.begin() , ans.end() );

	return ans;
}*/

vector< int > guess(int n) 
{
	vector< int > ans;

	if( n <= 15 )
	{
		for (int i = 1; i <= n; i++)
			ans.push_back( ask(i) );

		return ans;
	}

	int k = 4;

	ans.push_back( ask( 1 ) );

	int last = 0;

	while( last < n )
	{
		vector< int > query;

		for(int i = last ; i < last + k && i < n ; i++)
			query.push_back( i + 1 );

		int qtdNumbers = query.size();

		vector< int > aux = get_pairwise_xor( query );
		vector< int > answerQuery;

		for(int i = qtdNumbers ; i < aux.size() ; i += 2)
			answerQuery.push_back( aux[i] );

		vector< pii > allPairs;

		for(int i = 0 ; i < qtdNumbers ; i++)
			for(int j = i + 1 ; j < qtdNumbers ; j++)
				allPairs.push_back( { i , j } );

		do
		{
			vector< int > values( qtdNumbers , 0 );
			values[0] = ans[last];

			for(int i = 0 ; i < allPairs.size() ; i++)
			{
				if( allPairs[i].first != 0 ) continue;
				int curInd = allPairs[i].second;

				values[curInd] = aux[i]^values[0];
			}

			vector< int > allXor;

			for(int i = 0 ; i < qtdNumbers ; i++)
				for(int j = i + 1 ; j < qtdNumbers ; j++)
					allXor.push_back( values[i]^values[j] );

			sort( allXor.begin() , allXor.end() );

			if( allXor == answerQuery )
			{
				for(int i = 1 ; i < qtdNumbers ; i++)
					ans.push_back( values[i] );

				break;
			}

		} while( next_permutation( allPairs.begin() , allPairs.end() ));

		last = last + k;
	}

	return ans;
}

Compilation message (stderr)

Xoractive.cpp: In function 'std::vector<int> guess(int)':
Xoractive.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = qtdNumbers ; i < aux.size() ; i += 2)
                            ~~^~~~~~~~~~~~
Xoractive.cpp:72:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0 ; i < allPairs.size() ; i++)
                    ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 0 / 94