02 2023 档案
摘要：Lemonade Change At a lemonade stand, each lemonade costs $5. Customers are standing in a queue to buy from you and order one at a time (in the order s
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摘要：Divisor Game Alice and Bob take turns playing a game, with Alice starting first. Initially, there is a number n on the chalkboard. On each player's tu
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摘要：Valid Boomerang Given an array points where points[i] = [xi, yi] represents a point on the X-Y plane, return true if these points are a boomerang. A b
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摘要：Remove All Adjacent Duplicates In String You are given a string s consisting of lowercase English letters. A duplicate removal consists of choosing tw
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摘要：Find the Town Judge In a town, there are n people labeled from 1 to n. There is a rumor that one of these people is secretly the town judge. If the to
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摘要：Unique Morse Code Words International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: '
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摘要：Maximum Number of Balloons Given a string text, you want to use the characters of text to form as many instances of the word "balloon" as possible. Yo
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摘要：Split a String in Balanced Strings Balanced strings are those that have an equal quantity of 'L' and 'R' characters. Given a balanced string s, split
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摘要：Reformat Data Given a date string in the form Day Month Year, where: Day is in the set {"1st", "2nd", "3rd", "4th", ..., "30th", "31st"}. Month is in
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摘要：Shuffle String You are given a string s and an integer array indices of the same length. The string s will be shuffled such that the character at the
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摘要：Kth Missing Positive Number Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Return the kth positive i
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摘要：Defanging an IP Address Given a valid (IPv4) IP address, return a defanged version of that IP address. A defanged IP address replaces every period "."
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摘要：Verifying an Alien Dictionary In an alien language, surprisingly, they also use English lowercase letters, but possibly in a different order. The orde
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摘要：Kth Largest Element in a Stream Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted orde
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摘要：Min Cost Climbing Stairs You are given an integer array cost where cost[i] is the cost of ith step on a staircase. Once you pay the cost, you can eith
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摘要：Largest Number At Least Twice of Others You are given an integer array nums where the largest integer is unique. Determine whether the largest element
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摘要：Shortest Completing Word Given a string licensePlate and an array of strings words, find the shortest completing word in words. A completing word is a
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摘要：Minimum Distancd Between Nodes Given the root of a Binary Search Tree (BST), return the minimum difference between the values of any two different nod
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摘要：Goat Latin You are given a string sentence that consist of words separated by spaces. Each word consists of lowercase and uppercase letters only. We w
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摘要：Smallest Range I You are given an integer array nums and an integer k. In one operation, you can choose any index i where 0 <= i < nums.length and cha
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摘要：Shortest Distance to a Character Given a string s and a character c that occurs in s, return an array of integers answer where answer.length == s.leng
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摘要：Last Stone Weight You are given an array of integers stones where stones[i] is the weight of the ith stone. We are playing a game with the stones. On
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摘要：Height Checker A school is trying to take an annual photo of all the students. The students are asked to stand in a single file line in non-decreasing
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摘要：Maximum 69 Number You are given a positive integer num consisting only of digits 6 and 9. Return the maximum number you can get by changing at most on
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摘要：Check if N and Its Double Exist Given an array arr of integers, check if there exist two indices i and j such that : i != j 0 <= i, j < arr.length arr
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摘要：How Many Numbers Are Smaller Than the Current Number Given the array nums, for each nums[i] find out how many numbers in the array are smaller than it
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摘要：Generate a String With Characters That Have Odd Counts Given an integer n, return a string with n characters such that each character in such string o
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