https://leetcode.com/problems/first-letter-to-appear-twice/description/
First Letter to Appear Twice - LeetCode
First Letter to Appear Twice - Given a string s consisting of lowercase English letters, return the first letter to appear twice. Note: * A letter a appears twice before another letter b if the second occurrence of a is before the second occurrence of b. *
leetcode.com
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class Solution:
def repeatedCharacter(self, s: str) -> str:
string_list = []
for i in s:
if i not in string_list:
string_list.append(i)
else:
return i
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cs |
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