摘要：
The problem: (This prolem include many programming skills in using recursion!!)Givennpairs of parentheses, write a function to generate all combinatio... 阅读全文
摘要：
The quesiton:Given a string containing just the characters'(',')','{','}','['and']', determine if the input string is valid.The brackets must close in... 阅读全文
摘要：
The question:Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices ... 阅读全文
摘要：
The Problem:Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices o... 阅读全文
摘要：
The questions:Determine whether an integer is a palindrome. Do this without extra space.Analysis:To determine whether an integer is a palindrome, we c... 阅读全文
摘要：
Reverse a integer is a very common task we need to understand for being a good programmer. It is very easy at some aspects, however, it also needs a p... 阅读全文