摘要：
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space fo 阅读全文
摘要：
Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are thi 阅读全文
摘要：
We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wron 阅读全文
摘要：
Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 计算n!结果的末尾有几个零。 题目要求复杂度为对 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 阅读全文
摘要：
You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly kcoins. Given n, find the total number 阅读全文