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摘要： 题目要求 We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each strin 阅读全文

摘要： 题目要求 Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally me 阅读全文

摘要： 题目要求 Given an array A of non-negative integers, return an array consisting of all the even elements of A, followed by all the odd elements of A. You m 阅读全文

摘要： 题目要求 International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a" maps to ".-", "b 阅读全文

摘要： 题目要求 In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N time 阅读全文

摘要： 题目要求 Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. 题目分析及思路 题目要求返回一个字符串的小写形式。可以直接使用lower( 阅读全文

摘要： 题目要求 A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. 题目分析及思路 题目要求当输入的 阅读全文

摘要： 题目要求 Every email consists of a local name and a domain name, separated by the @ sign. For example, in alice@leetcode.com, alice is the local name, and 阅读全文

摘要： 题目要求 You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of 阅读全文