好像也沒什麼特別做法
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一二三四五
def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
allowed_set = set(c for c in allowed)
ans = 0
for w in words:
ans += 1
for c in w:
if c not in allowed_set:
ans -= 1
break
return ans

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