Initialization of dynamic multidimensional array

[berni via Digitalmars-d-learn]

With X not known at compile time:

auto arr = new int[][](X,X);
for (int i=0;i<X;i++)
  for (int j=0;j<X;j++)
    arr[i][j] = -1;

Is there anything better for this? I mean, the program will fill 
the array with zeroes, just to overwrite all of them with -1. 
That's wasted execution time and doesn't feel D-ish to me.