Revise paste brick field generation

struct Brick {
  Rectangle rect{};
  Color color{WHITE};
  int hits{1}; // simple durability if you want to extend later
  bool alive() const { return hits > 0; }
  void render() const { DrawRectangleRec(rect, color); }
};

std::vector<Brick> bricks;
  const int cols = 12;
  const int rows = 6;
  const float marginX = 16.0f;
  const float marginY = 60.0f;
  const float gap = 4.0f;
  const float bw = (WIDTH - marginX * 2 - gap * (cols - 1)) / cols;
  const float bh = 20.0f;

for (int r = 0; r < rows; ++r) {
    for (int c = 0; c < cols; ++c) {
      float x = marginX + c * (bw + gap);
      float y = marginY + r * (bh + gap);
      Color color = Color{(unsigned char)(180 - r * 20),
                          (unsigned char)(120 + r * 20), 255, 255};
      bricks.push_back(Brick{Rectangle{x, y, bw, bh}, color, 1});
    }
  }

//OR: 
int index = 0;
std::generate_n(std::back_inserter(bricks), rows * cols, [&]() {
    int r = index / cols;   // row
    int c = index % cols;   // col
    index++;

float x = marginX + c * (bw + gap);
    float y = marginY + r * (bh + gap);

Color color{ static_cast<unsigned char>(180 - r * 20),
                 static_cast<unsigned char>(120 + r * 20),
                 255, 255 };

return Brick{ Rectangle{x, y, bw, bh}, color, 1 };
});