From 63c3043200de6b28a8c192f1b5625940435ea55e Mon Sep 17 00:00:00 2001 From: Jed Barber Date: Sat, 17 Oct 2015 14:20:48 +1100 Subject: Organised source code a bit, added makefile with clean target --- sort/mergesort.hs | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 sort/mergesort.hs (limited to 'sort/mergesort.hs') diff --git a/sort/mergesort.hs b/sort/mergesort.hs new file mode 100644 index 0000000..5c140b3 --- /dev/null +++ b/sort/mergesort.hs @@ -0,0 +1,19 @@ + + + +mergeSort :: Ord a => [a] -> [a] +mergeSort x | length x <= 1 = x +mergeSort x = + let n = (length x) `div` 2 + left = mergeSort (take n x) + right = mergeSort (drop n x) + in merge left right + + + +merge :: Ord a => [a] -> [a] -> [a] +merge [] y = y +merge x [] = x +merge (x:xs) (y:ys) = if x <= y then x:(merge xs (y:ys)) else y:(merge (x:xs) ys) + + -- cgit