Submission #1332198

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332198		andreim	Data Transfer (IOI19_transfer)	C++20	100 / 100	129 ms	1724 KiB

transfer

#include "transfer.h"
#include <iostream>
using namespace std;

vector<int> get_attachment(vector<int> source)
{
    int N_source = (int)source.size();

    int r = 0;
    while (((1 << r) - 1) < N_source + r)
		r++;

    vector<int> dataCols;
    int limit = (1 << r);
    for (int v = 1; v < limit && (int)dataCols.size() < N_source; v++)
	{
        if ((v & (v - 1)) == 0) continue;
        dataCols.push_back(v);
    }

    int xorRes = 0;
    for (int i = 0; i < N_source; i++)
        if (source[i] == 1)
			xorRes ^= dataCols[i];

    vector<int> res;
    for (int j = 0; j < r; j++)
		res.push_back((xorRes >> j) & 1);
    return res;
}

vector<int> retrieve(vector<int> data)
{
	int N = (int)data.size();
    int r = 0;
    while ((1 << r) - 1 < N)
		r++;
    int N_source = N - r;

    vector<int> dataCols;
    int limit = (1 << r);
    for (int v = 1; v < limit && (int)dataCols.size() < N_source; v++)
	{
        if ((v & (v - 1)) == 0) continue;
        dataCols.push_back(v);
    }

    int syndrome = 0;
    for (int i = 0; i < N_source; i++)
		if (data[i] == 1)
			syndrome ^= dataCols[i];
    for (int j = 0; j < r; j++)
		if (data[N_source + j] == 1)
			syndrome ^= (1 << j);

    if (syndrome != 0)
	{
        for (int i = 0; i < N_source; i++)
		{
            if (dataCols[i] == syndrome)
			{
            	data[i] = (data[i] + 1) % 2;
				break;
			}
        }
    }

	vector<int> res;
	for (int i = 0; i < N_source; i++)
		res.push_back(data[i]);
	return res;
}

Compilation message (stderr)

grader.cpp: In instantiation of 'void shuffle(std::vector<T>&) [with T = Scenario]':
grader.cpp:200:10:   required from here
grader.cpp:28:23: warning: 'void std::random_shuffle(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Scenario*, vector<Scenario> >]' is deprecated: use 'std::shuffle' instead [-Wdeprecated-declarations]
   28 |         random_shuffle(v.begin(), v.end());
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:61,
                 from grader.cpp:8:
/usr/include/c++/13/bits/stl_algo.h:4581:5: note: declared here
 4581 |     random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~~~~~~~~~~~

• Subtask 1: 60 / 60
• Subtask 2: 40 / 40