private string WriteOptimizedNDet(int n, int[] xRange, int[] yRange)
{
var stringBuilder = new StringBuilder();
var chacheSets = GetCacheSets(n);
var cacheVar = CreateCacheVarName(xRange, yRange);
if (!chacheSets.ContainsKey(cacheVar))
{
if (n > 2)
{
bool plus = true;
for (int i = 0; i < n; i++)
{
if (i > 0)
{
stringBuilder.Append(plus ? " + " : " - ");
}
int x = xRange[i];
int y = yRange[0];
stringBuilder.Append(Formatter.SourceMatrixElement(MatrixSize, y, x));
plus = !plus;
stringBuilder.Append(" * ");
stringBuilder.Append(WriteOptimizedNDet(n - 1, xRange.Where(j => j != x).ToArray(), yRange.Where(j => j != y).ToArray()));
}
}
else
{
stringBuilder.AppendFormat(Formatter.CacheContent(Formatter.SourceMatrixElement(MatrixSize, yRange[0], xRange[0]), Formatter.SourceMatrixElement(MatrixSize, yRange[1], xRange[1]), Formatter.SourceMatrixElement(MatrixSize, yRange[0], xRange[1]), Formatter.SourceMatrixElement(MatrixSize, yRange[1], xRange[0])));
}
chacheSets[cacheVar] = Formatter.CacheMember(cacheVar, stringBuilder.ToString());
stringBuilder.Clear();
}
return(cacheVar);
}