docs: public static int getRSSvalue(int[] widths, int maxWidth, boolean noNarrow) {
      int n = 0;
      for (int width : widths) {
        n += width;
      }
      int val = 0;
      int narrowMask = 0;
      int elements = widths.length;
      for (int bar = 0; bar < elements - 1; bar++) {
        int elmWidth;
        for (elmWidth = 1, narrowMask |= 1 << bar;
             elmWidth < widths[bar];
             elmWidth++, narrowMask &= ~(1 << bar)) {
          int subVal = combins(n - elmWidth - 1, elements - bar - 2);
          if (noNarrow && (narrowMask == 0) &&
              (n - elmWidth - (elements - bar - 1) >= elements - bar - 1)) {
            subVal -= combins(n - elmWidth - (elements - bar),
                              elements - bar - 2);
          }
          if (elements - bar - 1 > 1) {
            int lessVal = 0;
            for (int mxwElement = n - elmWidth - (elements - bar - 2);
                 mxwElement > maxWidth; mxwElement--) {
              lessVal += combins(n - elmWidth - mxwElement - 1,
                                 elements - bar - 3);
            }
            subVal -= lessVal * (elements - 1 - bar);
          } else if (n - elmWidth > maxWidth) {
            subVal--;
          }
          val += subVal;
        }
        n -= elmWidth;
      }
      return val;
    }