為什么我的解決方案無法通過 Leetcode 斷字問題

Question

當我單擊提交時，我的解決方案不起作用，因為它在某些情況下失敗，但是當我運行這些相同的測試用例時，在自定義測試用例下它可以工作。 有人可以幫我弄清楚為什么嗎？

這是我的解決方案

class Solution:

storage = set()
def wordBreak(self, s: str, wordDict: List[str]) -> bool:
    
    if not s or s in self.storage:
        return True
    
    for word in wordDict:
        if word in s:
            lst = s.split(word, 1)
            if self.wordBreak(lst[0], wordDict) and self.wordBreak(lst[1], wordDict):
                self.storage.add(s)
                return True
    
    return False
    

這是測試用例

"a" ["b"]

這是一張它不在提交中工作但在自定義測試用例下工作的圖片。

Answer 1

我有一個類似的問題。 我的代碼的問題是我在 function 之外初始化了列表，因此每次調用 function 時都會更新它，而我希望每次調用 ZC1C425268E68385D1AB5074C14ZA 時它都為空。 所以我在function的末尾清空了。

如果你能給出問題陳述，就更容易弄清楚實際問題是什么。

Answer 2

它在這些測試用例上失敗，因為storage不會在連續的測試運行之間重置為空集，因此它將包含有關下一個測試用例的錯誤信息。

但是，即使您管理該storage以便在每次測試時重置它，您也會在更復雜的測試用例中遇到超時消息。 所以你需要一個更有效的算法。

為確保您的代碼有效，我建議您注意以下測試用例：

"fohhemkkaecojceoaejkkoedkofhmohkcjmkggcmnami"
["kfomka","hecagbngambii","anobmnikj","c","nnkmfelneemfgcl","ah","bgomgohl","lcbjbg","ebjfoiddndih","hjknoamjbfhckb","eioldlijmmla","nbekmcnakif","fgahmihodolmhbi","gnjfe","hk","b","jbfgm","ecojceoaejkkoed","cemodhmbcmgl","j","gdcnjj","kolaijoicbc","liibjjcini","lmbenj","eklingemgdjncaa","m","hkh","fblb","fk","nnfkfanaga","eldjml","iejn","gbmjfdooeeko","jafogijka","ngnfggojmhclkjd","bfagnfclg","imkeobcdidiifbm","ogeo","gicjog","cjnibenelm","ogoloc","edciifkaff","kbeeg","nebn","jdd","aeojhclmdn","dilbhl","dkk","bgmck","ohgkefkadonafg","labem","fheoglj","gkcanacfjfhogjc","eglkcddd","lelelihakeh","hhjijfiodfi","enehbibnhfjd","gkm","ggj","ag","hhhjogk","lllicdhihn","goakjjnk","lhbn","fhheedadamlnedh","bin","cl","ggjljjjf","fdcdaobhlhgj","nijlf","i","gaemagobjfc","dg","g","jhlelodgeekj","hcimohlni","fdoiohikhacgb","k","doiaigclm","bdfaoncbhfkdbjd","f","jaikbciac","cjgadmfoodmba","molokllh","gfkngeebnggo","lahd","n","ehfngoc","lejfcee","kofhmoh","cgda","de","kljnicikjeh","edomdbibhif","jehdkgmmofihdi","hifcjkloebel","gcghgbemjege","kobhhefbbb","aaikgaolhllhlm","akg","kmmikgkhnn","dnamfhaf","mjhj","ifadcgmgjaa","acnjehgkflgkd","bjj","maihjn","ojakklhl","ign","jhd","kndkhbebgh","amljjfeahcdlfdg","fnboolobch","gcclgcoaojc","kfokbbkllmcd","fec","dljma","noa","cfjie","fohhemkka","bfaldajf","nbk","kmbnjoalnhki","ccieabbnlhbjmj","nmacelialookal","hdlefnbmgklo","bfbblofk","doohocnadd","klmed","e","hkkcmbljlojkghm","jjiadlgf","ogadjhambjikce","bglghjndlk","gackokkbhj","oofohdogb","leiolllnjj","edekdnibja","gjhglilocif","ccfnfjalchc","gl","ihee","cfgccdmecem","mdmcdgjelhgk","laboglchdhbk","ajmiim","cebhalkngloae","hgohednmkahdi","ddiecjnkmgbbei","ajaengmcdlbk","kgg","ndchkjdn","heklaamafiomea","ehg","imelcifnhkae","hcgadilb","elndjcodnhcc","nkjd","gjnfkogkjeobo","eolega","lm","jddfkfbbbhia","cddmfeckheeo","bfnmaalmjdb","fbcg","ko","mojfj","kk","bbljjnnikdhg","l","calbc","mkekn","ejlhdk","hkebdiebecf","emhelbbda","mlba","ckjmih","odfacclfl","lgfjjbgookmnoe","begnkogf","gakojeblk","bfflcmdko","cfdclljcg","ho","fo","acmi","oemknmffgcio","mlkhk","kfhkndmdojhidg","ckfcibmnikn","dgoecamdliaeeoa","ocealkbbec","kbmmihb","ncikad","hi","nccjbnldneijc","hgiccigeehmdl","dlfmjhmioa","kmff","gfhkd","okiamg","ekdbamm","fc","neg","cfmo","ccgahikbbl","khhoc","elbg","cbghbacjbfm","jkagbmfgemjfg","ijceidhhajmja","imibemhdg","ja","idkfd","ndogdkjjkf","fhic","ooajkki","fdnjhh","ba","jdlnidngkfffbmi","jddjfnnjoidcnm","kghljjikbacd","idllbbn","d","mgkajbnjedeiee","fbllleanknmoomb","lom","kofjmmjm","mcdlbglonin","gcnboanh","fggii","fdkbmic","bbiln","cdjcjhonjgiagkb","kooenbeoongcle","cecnlfbaanckdkj","fejlmog","fanekdneoaammb","maojbcegdamn","bcmanmjdeabdo","amloj","adgoej","jh","fhf","cogdljlgek","o","joeiajlioggj","oncal","lbgg","elainnbffk","hbdi","femcanllndoh","ke","hmib","nagfahhljh","ibifdlfeechcbal","knec","oegfcghlgalcnno","abiefmjldmln","mlfglgni","jkofhjeb","ifjbneblfldjel","nahhcimkjhjgb","cdgkbn","nnklfbeecgedie","gmllmjbodhgllc","hogollongjo","fmoinacebll","fkngbganmh","jgdblmhlmfij","fkkdjknahamcfb","aieakdokibj","hddlcdiailhd","iajhmg","jenocgo","embdib","dghbmljjogka","bahcggjgmlf","fb","jldkcfom","mfi","kdkke","odhbl","jin","kcjmkggcmnami","kofig","bid","ohnohi","fcbojdgoaoa","dj","ifkbmbod","dhdedohlghk","nmkeakohicfdjf","ahbifnnoaldgbj","egldeibiinoac","iehfhjjjmil","bmeimi","ombngooicknel","lfdkngobmik","ifjcjkfnmgjcnmi","fmf","aoeaa","an","ffgddcjblehhggo","hijfdcchdilcl","hacbaamkhblnkk","najefebghcbkjfl","hcnnlogjfmmjcma","njgcogemlnohl","ihejh","ej","ofn","ggcklj","omah","hg","obk","giig","cklna","lihaiollfnem","ionlnlhjckf","cfdlijnmgjoebl","dloehimen","acggkacahfhkdne","iecd","gn","odgbnalk","ahfhcd","dghlag","bchfe","dldblmnbifnmlo","cffhbijal","dbddifnojfibha","mhh","cjjol","fed","bhcnf","ciiibbedklnnk","ikniooicmm","ejf","ammeennkcdgbjco","jmhmd","cek","bjbhcmda","kfjmhbf","chjmmnea","ifccifn","naedmco","iohchafbega","kjejfhbco","anlhhhhg"]

和：

"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab"
["a","aa","aaa","aaaa","aaaaa","aaaaaa","aaaaaaa","aaaaaaaa","aaaaaaaaa","aaaaaaaaaa"]

我會留下兩個提示來尋找更好的算法：

1.嘗試

2. memoization（動態編程）