挑戰(zhàn)每日打卡python基礎(chǔ)題,堅(jiān)持100題
come with me !今日練習(xí):判斷一個(gè)字符串是否是一致字符串
給你一個(gè)由不同字符組成的字符串 allowed 和一個(gè)字符串?dāng)?shù)組 words 。如果一個(gè)字符串的每一個(gè)字符都在 allowed 中,就稱這個(gè)字符串是 一致字符串 。
請(qǐng)你返回 words 數(shù)組中 一致字符串 的數(shù)目。
解法一:
class Solution:
def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
res = 0
for i in words:
for j in i:
if j not in allowed:
break
else:
res += 1
return res
解法二:
class Solution:
def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
res = 0
for i in words:
tmp = set(i)
for j in tmp:
#print(j)
if j not in allowed:
break
else:
res += 1
return res
解法三:
union() 返回兩個(gè)集合的并集 |
class Solution:
def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
res = 0
for i in words:
tmp = set(i)
all2 = set(allowed)
print(all2)
uni2 = tmp.union(all2)
if all2 == uni2:
res += 1
return res
pop() 隨機(jī)移除元素
remove() 移除指定元素