摘要： 题目： Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example 阅读全文

摘要： 题目： 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

摘要： 题目： Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For 阅读全文

摘要： 题目： Determine whether an integer is a palindrome. Do this without extra space. 简单题。看到两个比较好的解法，一个是把数字转化为字符串，然后首尾对比，往中间靠。另一种是数字分别从两头求和（保留位数：*10 + 余数），如果 阅读全文

摘要： 题目： Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see be 阅读全文

摘要： 题目 Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 简单题，需要考虑两个问题，1）如果输入的末尾是0怎么办？2）如果倒过来的数字溢出了怎么办？ 阅读全文

摘要： 题目： Given an integer, write a function to determine if it is a power of two. 非常简单的一道题目 阅读全文

摘要： 题目： Given a linked list, remove the nth node from the end of list and return its head. For example, 首先容易想到的是先遍历一次链表，计算链表长度L，然后再次遍历到L-n的位置删除结点。更好的办法是应用 阅读全文

摘要： 题目：Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lis 相对还是简单的， 阅读全文

摘要： 题目： 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 -> 2 -> 阅读全文