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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Binary-search/Standard-ML/binary-search.ml Normal file
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fun binary_search cmp (key, arr) =
let
fun aux slice =
if ArraySlice.isEmpty slice then
NONE
else
let
val mid = ArraySlice.length slice div 2
in
case cmp (ArraySlice.sub (slice, mid), key)
of LESS => aux (ArraySlice.subslice (slice, mid+1, NONE))
| GREATER => aux (ArraySlice.subslice (slice, 0, SOME mid))
| EQUAL => SOME (#2 (ArraySlice.base slice) + mid)
end
in
aux (ArraySlice.full arr)
end