sbool iiSumRect_debug;

static double iiSumRect(double[][] ii, Rect r) {
  if (r.y2() == 0 || r.x2() == 0) ret 0;
  double bottomLeft = r.x == 0 ? 0 : ii[r.y2()-1][r.x-1];
  double bottomRight = ii[r.y2()-1][r.x2()-1];
  double topLeft = r.x == 0 || r.y == 0 ? 0 : ii[r.y-1][r.x-1];
  double topRight = r.y == 0 ? 0 : ii[r.y-1][r.x2()-1];
  double result = bottomRight+topLeft-topRight-bottomLeft;
  if (iiSumRect_debug)
    printVars(+topLeft, +topRight, +bottomLeft, +bottomRight, +result);
  //ret bottomRight-topLeft-(topRight-topLeft)-(bottomLeft-topLeft);
  //ret bottomRight+topLeft-(topRight+bottomLeft);
  ret result;
}