結果
| 問題 | No.4 おもりと天秤 |
| コンテスト | |
| ユーザー |
e7a894
|
| 提出日時 | 2018-05-18 23:46:57 |
| 言語 | Haskell (9.14.1) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 704 bytes |
| 記録 | |
| コンパイル時間 | 4,492 ms |
| コンパイル使用メモリ | 192,384 KB |
| 実行使用メモリ | 19,236 KB |
| 最終ジャッジ日時 | 2026-03-17 09:38:36 |
| 合計ジャッジ時間 | 11,506 ms |
|
ジャッジサーバーID (参考情報) |
judge1_1 / judge2_0 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 22 TLE * 1 |
コンパイルメッセージ
Loaded package environment from /home/judge/.ghc/x86_64-linux-9.14.1/environments/default
[1 of 2] Compiling Main ( Main.hs, Main.o )
Main.hs:22:63: warning: [GHC-63394] [-Wx-partial]
In the use of ‘tail’
(imported from Data.List, but defined in GHC.Internal.List):
"This is a partial function, it throws an error on empty lists. Replace it with 'drop' 1, or use pattern matching or 'GHC.Internal.Data.List.uncons' instead. Consider refactoring to use "Data.List.NonEmpty"."
|
22 | | otherwise = (m, filter (<= (e - m)) ps):(getPairs e c (p:(tail ps)))
| ^^^^
[2 of 2] Linking a.out
ソースコード
import Data.List
main = do
n <- readLn :: IO Int
ws <- (map read . words) <$> getLine
let e = (sum ws) `div` 2
let ws' = filter (<= e) ws
putStrLn $ if (odd $ sum ws) || (sum ws' < e) then "impossible" else resolve e ws'
resolve e ws = resolve' (getPairs e 0 (reverse $ sort ws))
where
resolve' :: [(Int, [Int])] -> String
resolve' [] = "impossible"
resolve' pairs@((a,bs):ps)
| a == e = "possible"
| null bs = resolve' ps
| otherwise = resolve' ((getPairs e a bs) ++ ps)
getPairs :: Int -> Int -> [Int] -> [(Int,[Int])]
getPairs e c (p:ps)
| null ps = [(m, [])]
| otherwise = (m, filter (<= (e - m)) ps):(getPairs e c (p:(tail ps)))
where m = c + p
e7a894