scottwang - 博客园

2016年1月13日

摘要：题目描述：Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree is symmetric: 1 ... 阅读全文

posted @ 2016-01-13 18:55 scottwang 阅读(181) 评论(0) 推荐(0)

2016年1月12日

Java [Leetcode 110]Balanced Binary Tree

摘要：题目描述：Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the ... 阅读全文

posted @ 2016-01-12 17:50 scottwang 阅读(295) 评论(0) 推荐(0)

2016年1月10日

Java [Leetcode 326]Power of Three

摘要：题目描述：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?解题思路：对给定的数... 阅读全文

posted @ 2016-01-10 21:23 scottwang 阅读(227) 评论(0) 推荐(0)

2016年1月5日

Java [Leetcode 231]Power of Two

摘要：题目描述：Given an integer, write a function to determine if it is a power of two.解题思路：判断方法主要依据2的N次幂的特点：仅有首位为1，其余各位都为0.代码如下：public class Solution { publ... 阅读全文

posted @ 2016-01-05 14:48 scottwang 阅读(276) 评论(0) 推荐(0)

Java [Leetcode 232]Implement Queue using Stacks

摘要：题目描述：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 fr... 阅读全文

posted @ 2016-01-05 14:22 scottwang 阅读(229) 评论(0) 推荐(0)

Java [Leetcode 232]Implement Queue using Stacks

摘要：题目描述：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 fr... 阅读全文

posted @ 2016-01-05 14:22 scottwang 阅读(160) 评论(0) 推荐(0)

2015年12月28日

Java [Leetcode 202]Happy Number

摘要：题目描述：Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive in... 阅读全文

posted @ 2015-12-28 15:32 scottwang 阅读(242) 评论(0) 推荐(0)

Java [Leetcode 263]Ugly Number

摘要：题目描述：Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include2, 3, 5. For ... 阅读全文

posted @ 2015-12-28 14:52 scottwang 阅读(222) 评论(0) 推荐(0)

Java [Leetcode 83]Remove Duplicates from Sorted List

摘要：题目描述：Given a sorted linked list, delete all duplicates such that each element appear onlyonce.For example,Given1->1->2, return1->2.Given1->1->2->3->3,... 阅读全文

posted @ 2015-12-28 14:40 scottwang 阅读(193) 评论(0) 推荐(0)

Java [Leetcode 70]Climbing Stairs

摘要：题目描述：You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you ... 阅读全文

posted @ 2015-12-28 14:11 scottwang 阅读(194) 评论(0) 推荐(0)

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