elems[MAX_SIZE]; // 10^6
elemsTemp[MAX_SIZE];
elemSum = 0;

for ( elem from entryData ) {
  for (i = 0; i <= elemSum; i++) {
    if (elems[i] == 0 and i != 0) {
      continue;
    }
    x = elems[i];
    y = x - i;

    // Dodajemy nowe "pary"
    new_x_1 = x + elem;
    new_y_1 = y;
    // Pamiętamy o tym, że x >= y ;)
    new_x_2 = max(x, y + elem);
    new_y_2 = min(x, y + elem);

    add_pair(new_x_1, new_y_1);
    add_pair(new_x_2, new_y_2);

    copy_temp_to_elem(); // Sam zaimplementuj :P
  }
  elemSum++;
}

void add_pair(int x, int y) {
  int diff = x - y;
  if (x > elemsTemp[diff]) {
    elemsTemp[diff] = x;
  }
}