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Update 第一个只出现一次的字符.py #9
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blist并不一定是按原本顺序的,可能是乱序的,blist第一个值为1的字符i 并不一定是alist中第一个出现1次的字符,可能是第2个、第3个,所以应该从alist中循环而不是blist