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问题： Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: begin t 阅读全文
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问题： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is l 阅读全文
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题目： Given an integer, write a function to determine if it is a power of two. 答案： 2的幂有两个特点： 1）大于0 2）二进制形式都是首位为1，其余位为0，因此n&(n-1)等于0 阅读全文