Add 2015 sources

1 files changed, 20 insertions, 0 deletions

diff --git a/2015/day17.hs b/2015/day17.hs
new file mode 100644
index 0000000..9b5af87
--- /dev/null
+++ b/2015/day17.hs
@@ -0,0 +1,20 @@
+import Control.Monad
+
+search :: Int -> [Int] -> [[Int]]
+search 0 [] = [[]]
+search _ [] = []
+search target (sz:szs)
+    | target < 0  = []
+    | target == 0 = [[]]
+    | target < sz = search target szs
+    | otherwise   = map (sz:) (search (target-sz) szs) ++ search target szs
+
+day17 :: IO ()
+day17 = do
+    input <- liftM (map read . lines) $ readFile "day17.txt"
+    let fullsearch = search 150 input
+        minlength  = minimum $ map length fullsearch
+        minposs    = filter (\x -> length x == minlength) fullsearch
+    print $ length minposs  -- part 1: do fullsearch instead of minposs
+
+main = day17