题目 Given an integer, write a function to determine if it is a power of two. 解题思路 任何一个2的x次方一定能被int型里最大的2的x次方整除，…

题目 Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 解题思路 根据一个…

题目 Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximu…

题目 Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left …

题目 Given a positive integer num, write a function which returns True if num is a perfect square else False. No…

题目 You are a professional robber planning to rob houses along a street. Each house has a certain amount of mon…

题目 Given a non-empty integer array of size n, find the minimum number of moves required to make all array elem…

题目 You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time …

题目 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999.…

题目 Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative…

题目 Given a group of two strings, you need to find the longest uncommon subsequence of this group of two string…

题目 Given an integer array, find three numbers whose product is maximum and output the maximum product. Example…