[Solved] Ranging over map keys of array type and slicing each array gives the same array for each iteration

Question

Since the map key type is an array, the assignment:

for k,_ := range ans {

will rewrite k for every iteration. This will rewrite the contents of the array k. The slice k[:] points to k as the underlying array, so all the slices with k as their underlying array will be overwritten as well.

Copy the array for each iteration, as you did. That will create separate arrays for the slices you append.

Accepted Answer

Since the map key type is an array, the assignment:

for k,_ := range ans {

will rewrite k for every iteration. This will rewrite the contents of the array k. The slice k[:] points to k as the underlying array, so all the slices with k as their underlying array will be overwritten as well.

Copy the array for each iteration, as you did. That will create separate arrays for the slices you append.