How it will work if value is negative?

#1

If array contains -5,-2,-1,0,1,2,5 then what will we do to sort negative values as indexing cannot be negative.

#2

You can modify the array if you have negative values so that all values are greater than or equal to 0.
In the array - -5 -2 -1 0 1 2 5, add 5 to all the values.
So the new array is - 0 3 4 5 6 7 10
Now apply counting sort algorithm and while displaying values, first subtract 5 from them.