Submission #1175740

#	Time	Username	Problem	Language	Result	Execution time	Memory
1175740		mannshah1211	Data Transfer (IOI19_transfer)	C++20	Compilation error	0 ms	0 KiB

transfer

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

using namespace std;

vector<int> get_attachment(vector<int> source) {
  int xo = 0, cnt = 0;
  for (int i = 0; i < source.size(); i++) {
    if (source[i] == 0) {
      xo ^= i;
      cnt++;
    } 
  }
  vector<int> attachment;
  for (int i = 5; i >= 0; i--) {
    if (xo & (1 << i)) {
      attachment.push_back(1);
    } else {
      attachment.push_back(0);
    }
  }
  attachment.push_back(cnt % 2);
}

vector<int> retrieve(vector<int> data) {
  int xo = 0, cnt = 0;
  for (int i = 0; i < data.size() - 7; i++) {
    if (source[i] == 0) {
      xo ^= i;
      cnt++;
    }
  }
  vector<int> ans;
  for (int i = 0; i < data.size() - 7; i++) {
    ans.push_back(data[i]);
  }
  int reported_parity = data[data.size() - 1], reported_xo = 0;
  for (int i = data.size() - 7; i < data.size() - 1; i++) {
    reported_xo = (2 * reported_xo) + data[i];
  }
  if (xo == reported_xo || cnt % 2 == reported_parity) {
    return ans;
  } 
  ans[xo ^ reported_xo] = 1 - ans[xo ^ reported_xo];
  return ans;
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
   23 | }
      | ^
transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:28:9: error: 'source' was not declared in this scope
   28 |     if (source[i] == 0) {
      |         ^~~~~~