結果
問題 | No.117 組み合わせの数 |
ユーザー | Haar |
提出日時 | 2018-09-27 00:04:56 |
言語 | Haskell (9.8.2) |
結果 |
MLE
|
実行時間 | - |
コード長 | 1,371 bytes |
コンパイル時間 | 10,648 ms |
コンパイル使用メモリ | 188,928 KB |
実行使用メモリ | 622,720 KB |
最終ジャッジ日時 | 2024-10-12 04:23:25 |
合計ジャッジ時間 | 12,271 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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コンパイルメッセージ
Loaded package environment from /home/judge/.ghc/x86_64-linux-9.8.2/environments/default [1 of 2] Compiling Main ( Main.hs, Main.o ) Main.hs:41:10: warning: [GHC-63394] [-Wx-partial] In the use of ‘tail’ (imported from Data.List, but defined in GHC.List): "This is a partial function, it throws an error on empty lists. Replace it with drop 1, or use pattern matching or Data.List.uncons instead. Consider refactoring to use Data.List.NonEmpty." | 41 | s' = tail . init $ s | ^^^^ Main.hs:43:40: warning: [GHC-63394] [-Wx-partial] In the use of ‘tail’ (imported from Data.List, but defined in GHC.List): "This is a partial function, it throws an error on empty lists. Replace it with drop 1, or use pattern matching or Data.List.uncons instead. Consider refactoring to use Data.List.NonEmpty." | 43 | (n,k) = (\(a,b) -> (read a, read $ tail b)) $ splitAt i s' | ^^^^ [2 of 2] Linking a.out
ソースコード
import Control.Monad import Data.Array import Data.List import Data.Int {-- n^p mod m --} powerMod :: Integral a => a -> a -> a -> a powerMod n 0 m = 1 powerMod n 1 m = n `mod` m powerMod n p m = (k * k * (if mod p 2 == 0 then 1 else n)) `mod` m where k = powerMod n (div p 2) m modinv n p = powerMod n (p-2) p factorials n m = scanl (\a b -> (a*b) `mod` m) 1 [1..n] divisor = 10^9+7 numElem = 10^6*2 factorials_ = listArray (0,numElem) $ factorials numElem divisor invfactorials_ = listArray (0,numElem) $ reverse $ scanl (\a b -> (a*(b+1))`mod`divisor) (modinv (factorials_!numElem) divisor) (reverse [0..numElem-1]) combinationModP_2 n k | n < k || n < 0 || k < 0 = 0 | otherwise = (factorials_!n * invfactorials_!k * invfactorials_!(n-k)) `mod` divisor permutationMod_2 n k | n < k || n < 0 || k < 0 = 0 | otherwise = (factorials_!n * invfactorials_!(n-k)) `mod` divisor hcombinationModP_2 n k | n < 0 || k < 0 = 0 | otherwise = combinationModP_2 (n+k-1) k parse (c:s) = case c of 'C' -> combinationModP_2 n k 'P' -> permutationMod_2 n k 'H' -> hcombinationModP_2 n k where s' = tail . init $ s Just i = elemIndex ',' s' (n,k) = (\(a,b) -> (read a, read $ tail b)) $ splitAt i s' main = do n <- readLn :: IO Int replicateM_ n $ do s <- getLine print $ parse s