From 64f0ef7212fca25e02fe4752e9a7dcfc4e4e36e5 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 1 Sep 2018 21:47:21 +0200
Subject: hsolve: fix bug

---
 hsolve/Main.hs      | 38 +-------------------------------------
 hsolve/hsolve.cabal |  2 +-
 2 files changed, 2 insertions(+), 38 deletions(-)

diff --git a/hsolve/Main.hs b/hsolve/Main.hs
index 52a0edd..7d99854 100644
--- a/hsolve/Main.hs
+++ b/hsolve/Main.hs
@@ -6,7 +6,6 @@ import Control.Monad.Writer
 import Data.Char
 import Data.Either
 import Data.List
-import Data.Maybe
 import System.Exit
 
 import qualified FSu
@@ -353,7 +352,7 @@ scratchPossIndirectReg mainreg intregs' =
         intcells = [intersectReg mainreg intreg | intreg <- intregs]
         alloweds = [foldl possOr emptyPoss (map possOf l) | l <- intcells]
         valOnlyInWhich =  -- [(index, value)] for each value in only one intersection
-            concat [maybe [] (\i -> [(val, i)]) (possGetIfInOne alloweds val)
+            concat [maybe [] (\i -> [(i, val)]) (possGetIfInOne alloweds val)
                    | val <- [0..8]]
     in foldM (\su1 (i,v) ->
                 scratchInRegionExcept
@@ -376,41 +375,6 @@ scratchPossIndirect su =
         foldM (\su' (regc, intregs) -> scratchPossIndirectReg (regc su') intregs)
               su params
 
--- scratchPossIndirectB :: Sudoku -> (Sudoku, [Action])
--- scratchPossIndirectB su = runWriter $ foldM bfunc su [0..8]
---   where
---     bfunc :: Sudoku -> Int -> SM Sudoku
---     bfunc su' bi =
---         let rowAllowed = flip map [0..2] $
---                 \i -> [possOf $ cell (3 * i + j) (Block bi su') | j <- [0..2]]
---             colAllowed = flip map [0..2] $
---                 \i -> [possOf $ cell (3 * j + i) (Block bi su') | j <- [0..2]]
---             rowIndices = scratchPairsFromAllowed rowAllowed
---             colIndices = scratchPairsFromAllowed colAllowed
---         in do
---             rowsu <- foldM (\su1 (i,n) ->  -- i: row number in block; n: value
---                             scratchInRegionExcept
---                                 n (rowOf (cell (3 * i) (Block bi su1)))
---                                 (Block bi su1)
---                                 (RCombine (reasonReg (Block bi su1)) RRow))
---                            su' rowIndices
---             colsu <- foldM (\su1 (i,n) ->  -- i: row number in block; n: value
---                             scratchInRegionExcept
---                                 n (colOf (cell i (Block bi su1)))
---                                 (Block bi su1)
---                                 (RCombine (reasonReg (Block bi su1)) RCol))
---                            rowsu colIndices
---             return colsu
-
---     -- return [(index, n)] for all the n that occur in only one blockrow
---     scratchPairsFromAllowed :: [[Poss]] -> [(Int, Value)]
---     scratchPairsFromAllowed plists =
---         let allowed = map (foldl1 possOr) plists
---         in catMaybes $
---             map (\(mi,n) -> maybe Nothing (\i -> Just (i,n)) mi) $
---                 -- v [(Just index if n exists in only one blockrow and else Nothing, n)]
---                 zip (map (possGetIfInOne allowed) [0..8]) [0..8]
-
 resolveCells :: Sudoku -> (Sudoku, [Action])
 resolveCells su = runWriter $ foldM func su [0..80]
   where
diff --git a/hsolve/hsolve.cabal b/hsolve/hsolve.cabal
index 4489d0b..66f2b3d 100644
--- a/hsolve/hsolve.cabal
+++ b/hsolve/hsolve.cabal
@@ -10,7 +10,7 @@ executable            hsolve
     hs-source-dirs:   .
     main-is:          Main.hs
     default-language: Haskell2010
-    ghc-options:      -Wall -O3 -Wno-incomplete-patterns
+    ghc-options:      -Wall -Wno-incomplete-patterns
     other-modules:    FSu
     build-depends:    base >= 4 && < 5,
                       mtl, array
-- 
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