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Reverse String 题目要求： Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". 题目大意： 阅读全文
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Nim Game 题目描述： You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to rem 阅读全文
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Add Digits 题目描述： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.For example:Given num = 38, the p 阅读全文