internal static short[] DoPlacement(int nrow, int ncol) {
int key = nrow * 1000 + ncol;
short[] pc = (short[])cache[key];
if (pc != null)
return pc;
Placement p = new Placement();
p.nrow = nrow;
p.ncol = ncol;
p.array = new short[nrow * ncol];
p.Ecc200();
cache[key] = p.array;
return p.array;
}