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摘要： 题目要求 A sentence S is given, composed of words separated by spaces. Each word consists of lowercase and uppercase letters only. We would like to conver 阅读全文

摘要： 题目要求 Alice and Bob have candy bars of different sizes: A[i] is the size of the i-th bar of candy that Alice has, and B[j] is the size of the j-th bar 阅读全文

摘要： 题目要求 In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. The order of the alphabet is some 阅读全文

摘要： 题目要求 Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths. If it is imp 阅读全文

摘要： 题目要求 Invert a binary tree. 题目分析及思路 给定一棵二叉树，要求每一层的结点逆序。可以使用递归的思想将左右子树互换。 python代码 # Definition for a binary tree node. # class TreeNode: # def __init__ 阅读全文

摘要： 题目要求 Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values. 题目分析及思路 给定一个正整数， 阅读全文

摘要： 题目要求 Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary represent 阅读全文

摘要： 题目要求 Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. 题目分析及思路 给定一棵非空二叉树，要求以列表的形式返回每一层结点值的平均 阅读全文

摘要： 题目要求 Given an n-ary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). 题目分析及思路 给定一棵N叉树，要求返回它的层次遍历结 阅读全文

摘要： 题目要求 In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original 阅读全文