原文链接: https://leetcode-cn.com/problems/split-array-with-same-average 英文原文You are given an integer array nums. You should move each element of nums into one of the two arrays A and B such that A and B are non-empty, and average(A) == average(B). Retur…

原文链接: https://leetcode-cn.com/problems/unique-morse-code-words 英文原文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' maps to "-...", 'c' maps to "-.-.", …

原文链接: https://leetcode-cn.com/problems/number-of-lines-to-write-string 英文原文You are given a string s of lowercase English letters and an array widths denoting how many pixels wide each lowercase English letter is. Specifically, widths[0] is the width …

原文链接: https://leetcode-cn.com/problems/max-increase-to-keep-city-skyline 英文原文There is a city composed of n x n blocks, where each block contains a single building shaped like a vertical square prism. You are given a 0-indexed n x n integer matrix gri…

原文链接: https://leetcode-cn.com/problems/soup-servings 英文原文There are two types of soup: type A and type B. Initially, we have n ml of each type of soup. There are four kinds of operations: Serve 100 ml of soup A and 0 ml of soup B, Serve 75 ml of soup …

原文链接: https://leetcode-cn.com/problems/expressive-words 英文原文Sometimes people repeat letters to represent extra feeling. For example: "hello" -> "heeellooo" "hi" -> "hiiii" In these strings like "heeellooo", we have groups of adjacent letters that are…

原文链接: https://leetcode-cn.com/problems/chalkboard-xor-game 英文原文You are given an array of integers nums represents the numbers written on a chalkboard. Alice and Bob take turns erasing exactly one number from the chalkboard, with Alice starting first.…

原文链接: https://leetcode-cn.com/problems/subdomain-visit-count 英文原文A website domain "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com" and at the lowest level, "discuss.leet…

原文链接: https://leetcode-cn.com/problems/largest-sum-of-averages 英文原文You are given an integer array nums and an integer k. You can partition the array into at most k non-empty adjacent subarrays. The score of a partition is the sum of the averages of e…

原文链接: https://leetcode-cn.com/problems/binary-tree-pruning 英文原文Given the root of a binary tree, return the same tree where every subtree (of the given tree) not containing a 1 has been removed. A subtree of a node node is node plus every node that is…

原文链接: https://leetcode-cn.com/problems/bus-routes 英文原文You are given an array routes representing bus routes where routes[i] is a bus route that the ith bus repeats forever. For example, if routes[0] = [1, 5, 7], this means that the 0th bus travels in…

原文链接: https://leetcode-cn.com/problems/ambiguous-coordinates 英文原文We had some 2-dimensional coordinates, like "(1, 3)" or "(2, 0.5)". Then, we removed all commas, decimal points, and spaces and ended up with the string s. For example, "(1, 3)" becomes…

原文链接: https://leetcode-cn.com/problems/linked-list-components 英文原文You are given the head of a linked list containing unique integer values and an integer array nums that is a subset of the linked list values. Return the number of connected components…

原文链接: https://leetcode-cn.com/problems/race-car 英文原文Your car starts at position 0 and speed +1 on an infinite number line. Your car can go into negative positions. Your car drives automatically according to a sequence of instructions 'A' (accelerate)…

原文链接: https://leetcode-cn.com/problems/most-common-word 英文原文Given a string paragraph and a string array of the banned words banned, return the most frequent word that is not banned. It is guaranteed there is at least one word that is not banned, and …

原文链接: https://leetcode-cn.com/problems/design-linked-list 英文原文Design your implementation of the linked list. You can choose to use a singly or doubly linked list. A node in a singly linked list should have two attributes: val and next. val is the val…

原文链接: https://leetcode-cn.com/problems/short-encoding-of-words 英文原文A valid encoding of an array of words is any reference string s and array of indices indices such that: words.length == indices.length The reference string s ends with the '#' charact…

原文链接: https://leetcode-cn.com/problems/shortest-distance-to-a-character 英文原文Given a string s and a character c that occurs in s, return an array of integers answer where answer.length == s.length and answer[i] is the distance from index i to the clos…

原文链接: https://leetcode-cn.com/problems/binary-trees-with-factors 英文原文Given an array of unique integers, arr, where each integer arr[i] is strictly greater than 1. We make a binary tree using these integers, and each number may be used for any number …

原文链接: https://leetcode-cn.com/problems/goat-latin 英文原文You are given a string sentence that consist of words separated by spaces. Each word consists of lowercase and uppercase letters only. We would like to convert the sentence to "Goat Latin" (a made…

原文链接: https://leetcode-cn.com/problems/friends-of-appropriate-ages 英文原文There are n persons on a social media website. You are given an integer array ages where ages[i] is the age of the ith person. A Person x will not send a friend request to a perso…

原文链接: https://leetcode-cn.com/problems/most-profit-assigning-work 英文原文You have n jobs and m workers. You are given three arrays: difficulty, profit, and worker where: difficulty[i] and profit[i] are the difficulty and the profit of the ith job, and w…

原文链接: https://leetcode-cn.com/problems/count-unique-characters-of-all-substrings-of-a-given-string 英文原文Let's define a function countUniqueChars(s) that returns the number of unique characters on s. For example if s = "LEETCODE" then "L", "T", "C", "O…

原文链接: https://leetcode-cn.com/problems/making-a-large-island 英文原文You are given an n x n binary matrix grid. You are allowed to change at most one 0 to be 1. Return the size of the largest island in grid after applying this operation. An island is a 4…

原文链接: https://leetcode-cn.com/problems/consecutive-numbers-sum 英文原文Given an integer n, return the number of ways you can write n as the sum of consecutive positive integers. Example 1: Input: n = 5 Output: 2 Explanation: 5 = 2 + 3 Example 2: Input: n…

原文链接: https://leetcode-cn.com/problems/positions-of-large-groups 英文原文In a string s of lowercase letters, these letters form consecutive groups of the same character. For example, a string like s = "abbxxxxzyy" has the groups "a", "bb", "xxxx", "z", a…

原文链接: https://leetcode-cn.com/problems/masking-personal-information 英文原文You are given a personal information string s, representing either an email address or a phone number. Return the masked personal information using the below rules. Email address…

原文链接: https://leetcode-cn.com/problems/design-circular-queue 英文原文Design your implementation of the circular queue. The circular queue is a linear data structure in which the operations are performed based on FIFO (First In First Out) principle and th…

原文链接: https://leetcode-cn.com/problems/flipping-an-image 英文原文Given an n x n binary matrix image, flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means that each row of the image is reversed. …

原文链接: https://leetcode-cn.com/problems/find-and-replace-in-string 英文原文You are given a 0-indexed string s that you must perform k replacement operations on. The replacement operations are given as three 0-indexed parallel arrays, indices, sources, and…