Submission #1006147

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006147		basa	Data Transfer (IOI19_transfer)	C++14	0 / 100	6 ms	4356 KiB

transfer

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

using namespace std;

vector<int>get_attachment(vector<int>a)
{
  int eo = 0;
  int one = 0;
  int n = 255;

  vector<int>ret;
  for(int i = 0; i < n; i++){
    eo ^= a[i];
    if(a[i] == 1) one ^= i + 1;
    ret.push_back(a[i]);
  }

  for(int i = 7; i >= 0; i--){
    int bit = 1 << i;
    if(one >= bit){
      one -= bit;
      ret.push_back(1);
    }
    else ret.push_back(0);
  }
  ret.push_back(eo);

  return ret;
}

vector<int> retrieve(vector<int> data)
{
  int eo = 0;
  int back = 0;
  int datasize = data.size();
  for(int i = 255; i < datasize - 1; i++){
    eo ^= data[i];
    if(data[i]) back += 1 << (7 - (i - 255));
  }

  vector<int>ret;
  for(int i = 0; i < 255; i++) ret.push_back(data[i]);

  if(eo != data[255 + 9 - 1]) return ret;

  int p = 0;
  for(int i = 0; i < 255; i++){
    if(data[i]) p ^= i + 1;
  }

  if((p ^ back) > 0) ret[(p ^ back) - 1] = !ret[(p ^ back) - 1];
  return ret;
}

• Subtask 1: 0 / 60
• Subtask 2: 0 / 40