编程题目：对于一个字符串，，请设计一个高效算法，找到第一次重复出现的字符。

 1 #!/usr/bin/env python3
 2 
 3 def find_str_repeat(s):
 4         d = {}
 5         for i in range(len(s)):
 6                 if d.get(s[i]):
 7                         return s[i]
 8                 else:
 9                         d[s[i]]= i
10         return False
11 
12 def find_str_repeat1(s):
13         d = {}
14         for i in s:
15                 if d.get(i):
16                         return i
17                 else:
18                         d[i] = i
19         return False
20 
21 if __name__ == "__main__":
22         s = "qywyer23tdd"
23         print(find_str_repeat(s))
24         print(find_str_repeat1(s))