摘要：
遍历的话若全部遍历则为N,若遍历k次，则为k class Solution: """ @param str: str: the given string @return: char: the first unique character in a given string """ def first 阅读全文
摘要：
i = [1,2,3,4,5,6] b = list(i) print(i) # [1,2,3,4,5,6] print(b) # [1,2,3,4,5,6] 阅读全文