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blist 并不一定是按顺序的，可能blist中的i并不一定是alist中第一个出现一次的字符
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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