08 2015 档案

Palindrome Number
摘要：Determine whether an integer is a palindrome. Do this without extra space.判断一个integer是否为回文。注意不要用额外的空间。另外，注意考虑负数。 1 public class Solution { 2 publ... 阅读全文
posted @ 2015-08-08 10:26 codingcat 阅读(170) 评论(0) 推荐(0)
Reverse Integer
摘要：Reverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321注意考虑几个情况，x=1534236460 1534236469 -2147483647等等。写的代码有点冗长了。 1 pub... 阅读全文
posted @ 2015-08-08 10:25 codingcat 阅读(255) 评论(0) 推荐(0)
Duplicate Emails
摘要：Write a SQL query to find all duplicate emails in a table namedPerson.+----+---------+| Id | Email |+----+---------+| 1 | a@b.com || 2 | c@d.com |... 阅读全文
posted @ 2015-08-08 10:24 codingcat 阅读(150) 评论(0) 推荐(0)
Power of Two
摘要：Given an integer, write a function to determine if it is a power of two.判断一个integer是否为2的幂。 1 public class Solution { 2 public static boolean isPow... 阅读全文
posted @ 2015-08-06 10:39 codingcat 阅读(115) 评论(0) 推荐(0)
Happy Number
摘要：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 integer... 阅读全文
posted @ 2015-08-06 10:16 codingcat 阅读(254) 评论(0) 推荐(0)
Same Tree
摘要：Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical an... 阅读全文
posted @ 2015-08-06 09:48 codingcat 阅读(132) 评论(0) 推荐(0)
Number of 1 Bits
摘要：Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as theHamming weight).For example, the 32-bit in... 阅读全文
posted @ 2015-08-06 09:28 codingcat 阅读(123) 评论(0) 推荐(0)