I do not think they programed in an array initializer.
In java (and probably other C like languages) you can go...
int[] arrayvar = {0,1,2,3,4,5,6,7,8,9}
To initialize an array of a certain size with values. I do not think SC2 galaxy scrript supports that because of how arrays are not objects and must have a defined size of type although it should not make a difference (it would just need a smarter compiler to read the number of entries on the line).
Thus you will probably need to initialize all values after or during map init. The good news is that you can initialize them any time before they are needed. As such you should probably initialize them during various graphical effects (small numbers at a time) or just before they are needed (if there are few values needing to be initialized).