Update 替换空格.py#6
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Jack-Lee-Hiter merged 1 commit intoJack-Lee-Hiter:masterfrom Jan 27, 2018
wangershi:patch-2
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replace1方法和replace2方法都是O(n*m)的时间复杂度，这里m是空格的数量，因为list的insert是一个O(n)的复杂度。 而list的append是一个O(1)的时间复杂度，除了扩容时的时间损耗，append方法只需要遍历一次数组即可得结果。
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replace1方法和replace2方法都是O(n*m)的时间复杂度，这里m是空格的数量，因为list的insert是一个O(n)的复杂度。
而list的append是一个O(1)的时间复杂度，除了扩容时的时间损耗，append方法只需要遍历一次数组即可得结果。