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题目： Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion? 答案： 判断一个数 阅读全文
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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
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question: Given a singly linked list, determine if it is a palindrome. Follow up:Could you do it in O(n) time and O(1) space? answer: 思路：把前半部分的链表翻转，再分 阅读全文
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1.链表是一种与火车非常相似的数据结构，在链表里，我们叫火车头为表头，每节车厢就是链表的元素，车厢里载的人和物就是元素的数据域，连接车厢的部件就是元素的指针。从火车的结构我们可以发现链表的一个特点，元素之间前后依赖，串联而成。 2.性质： 元素相互依赖，串联而成（除了火车头，每节车厢都只链接到前一节 阅读全文
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question： Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6Return: 阅读全文
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question: 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 remove 1 阅读全文
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question: Reverse a singly linked list. answer: 使用三个指针遍历单链表，逐个链接点进行反转。 阅读全文
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question: Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 - 阅读全文