Native lists are not arrays; O(i) access cost is prohibitive. Try Vector or Array ( or even Sequence, which at least has O(log i) access cost ).
O(i)
Vector
Array
Sequence
O(log i)
Also, actually test against the reference solution, not the user one.
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Native lists are not arrays;
O(i)access cost is prohibitive. TryVectororArray( or evenSequence, which at least hasO(log i)access cost ).Also, actually test against the reference solution, not the user one.