2018年2月28日
摘要：
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 exa 阅读全文
摘要：
You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c 阅读全文
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Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. 前缀和思想。如果修改的次数比较多，那么就可以用线段树了, class NumArray { pu 阅读全文
摘要：
Given an integer, write a function to determine if it is a power of three. 判断一个数，是不是3的n次幂。直接换底公式求解 阅读全文
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Given two arrays, write a function to compute their intersection. Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2]. Note: Each eleme 阅读全文
摘要：
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and . Example: Given a = 1 and b = 2, return 3. 不用加减法进行求和运算。 阅读全文
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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 3 4 and y 阅读全文
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Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built in library functio 阅读全文
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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? 判断一个链表是不是回文的。 思路：遍历节点得到总数tot，然后反转 阅读全文
摘要：
Implement the following operations of a queue using stacks. push(x) Push element x to the back of queue. pop() Removes the element from in front of qu 阅读全文