I have not managed to find it either, but based on the comments the issue seems to be with the testing of the algorithm, which contains something like ``` list

I have not managed to find it either, but based on the comments the issue seems to be with the testing of the algorithm, which contains something like ``` list = [1,2,3,4,5,6 ..., 7999, 8000] ``` i.e. a written out literal, that the swift compiler has trouble type-checking if everything in there is an int.