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  1. struct Bitmap {
  2.    color getColor(point p);
  3.    point next(point p);
  4. }
  5. struct Pixel { 
  6.    color C; 
  7.    point P 
  8. };
  9. std::map<Bitmap*, Pixel> GetUniquePixels(const std::vector<Bitmap>& bitmaps) {
  10.     typedef unordered_map<color,Bitmap*> maybe_unique;
  11.     typedef unordered_set<color> not_unique;
  12.     std::map<point, std::pair<maybe_unique, not_unique>> uniqueness;
  13.     for(int bit = 0; bit < bitmaps.size(); ++bit)
  14.         for(point p = 0; p < bitmaps.size(); p = bitmap.next(point);
  15.             color cur = bitmaps[bit].getColor(p);
  16.             auto cur_unique = uniqueness[p];
  17.             if (cur_unique.second.find(cur) != cur_unique.second.end()) 
  18.                 continue;
  19.             auto it = cur_unique.first.find(cur);
  20.             if (it != cur_unique.first.end()) {
  21.                 cur_unique.first.erase(cur);
  22.                 cur_unique.second.insert(cur);
  23.             } else {
  24.                 cur_unique.first.insert(std::make_pair(cur, &bitmaps[bit]));
  25.             }
  26.         }
  27.     }
  28.     std::map<Bitmap, Pixel> result;
  29.     for(auto u_it = uniqueness.begin(); u_it != uniqueness.end() ++u_it) {
  30.         for(auto m_it = u_it->first.begin(); m_it != u_it->first.end(); ++m_it)
  31.             result.insert(std::make_pair(m_it->second, Pixel(u_it->first, m_it->first));
  32.     }
  33. }
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https://ideone.com/wHOLcg
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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