06 2020 档案
摘要：You are given a list of airline tickets where tickets[i] = [fromi, toi] represent the departure and the arrival airports of one flight. Reconstruct th
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摘要：Given an integer n, return the least number of perfect square numbers that sum to n. A perfect square is an integer that is the square of an integer;
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摘要：There are n people whose IDs go from 0 to n - 1 and each person belongs exactly to one group. Given the array groupSizes of length n telling the group
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摘要：Given an integer array nums which is sorted in ascending order and all of its elements are unique and given also an integer k, return the kth missing
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摘要：Given a string s and a dictionary of strings wordDict, add spaces in s to construct a sentence where each word is a valid dictionary word. Return all
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摘要：Given two version strings, version1 and version2, compare them. A version string consists of revisions separated by dots '.'. The value of the revisio
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摘要：Given an integer n, return all the structurally unique BST's (binary search trees), which has exactly n nodes of unique values from 1 to n. Return the
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摘要：Given the root of a binary tree, return the average value of the nodes on each level in the form of an array. Answers within 10-5 of the actual answer
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摘要：Your country has an infinite number of lakes. Initially, all the lakes are empty, but when it rains over the nth lake, the nth lake becomes full of wa
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摘要：Given an array of strings names of size n. You will create n folders in your file system such that, at the ith minute, you will create a folder with t
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摘要：Given two integers dividend and divisor, divide two integers without using multiplication, division and mod operator. Return the quotient after dividi
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摘要：The set [1, 2, 3, ..., n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, we get the following s
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摘要：Given a string S, consider all duplicated substrings: (contiguous) substrings of S that occur 2 or more times. (The occurrences may overlap.) Return a
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摘要：Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compute the resea
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摘要：We run a preorder depth first search on the root of a binary tree. At each node in this traversal, we output D dashes (where D is the depth of this no
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摘要：You are given an integer array values where values[i] represents the value of the ith sightseeing spot. Two sightseeing spots i and j have a distance
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摘要：Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid IPv6 address or "Neither" if IP is not a correct IP of an
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摘要：You are given the root node of a binary search tree (BST) and a value to insert into the tree. Return the root node of the BST after the insertion. It
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摘要：Given a sorted array arr, two integers k and x, find the k closest elements to x in the array. The result should also be sorted in ascending order. If
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摘要：There are n cities connected by some number of flights. You are given an array flights where flights[i] = [fromi, toi, pricei] indicates that there is
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摘要：Given an integer array arr and a target value target, return the integer value such that when we change all the integers larger than value in the give
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摘要：Given a set of distinct positive integers nums, return the largest subset answer such that every pair (answer[i], answer[j]) of elements in this subse
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摘要：RandomizedCollection is a data structure that contains a collection of numbers, possibly duplicates (i.e., a multiset). It should support inserting an
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摘要：You are given an m x n binary matrix grid. An island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You may
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摘要：Given an integer array nums and an integer k, return the kth largest element in the array. Note that it is the kth largest element in the sorted order
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摘要：Given an integer array nums, move all the even integers at the beginning of the array followed by all the odd integers. Return any array that satisfie
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摘要：Note: This is a companion problem to the System Design problem: Design TinyURL. TinyURL is a URL shortening service where you enter a URL such as http
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摘要：Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. Your t
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摘要：Given an array of integers nums and an integer k, return the number of contiguous subarrays where the product of all the elements in the subarray is s
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摘要：Given two strings s and t, return true if s is a subsequence of t, or false otherwise. A subsequence of a string is a new string that is formed from t
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摘要：The i-th person has weight people[i], and each boat can carry a maximum weight of limit. Each boat carries at most 2 people at the same time, provided
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摘要：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 specified by bil
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摘要：给定一个数字，我们按照如下规则把它翻译为字符串：0 翻译成 “a” ，1 翻译成 “b”，……，11 翻译成 “l”，……，25 翻译成 “z”。一个数字可能有多个翻译。请编程实现一个函数，用来计算一个数字有多少种不同的翻译方法。 示例 1: 输入: 12258输出: 5解释: 12258有5种不同
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摘要：You are given coins of different denominations and a total amount of money. Write a function to compute the number of combinations that make up that a
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摘要：You have an array of logs. Each log is a space delimited string of words. For each log, the first word in each log is an alphanumeric identifier. Then
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摘要：The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the
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摘要：Given an array equations of strings that represent relationships between variables, each string equations[i] has length 4 and takes one of two differe
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摘要：You are given an array of people, people, which are the attributes of some people in a queue (not necessarily in order). Each people[i] = [hi, ki] rep
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摘要：You are given an array of positive integers w where w[i] describes the weight of ith index (0-indexed). We need to call the function pickIndex() which
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摘要：Given an integer array nums, return the length of the longest strictly increasing subsequence. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output:
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摘要：Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. E
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摘要：A company is planning to interview 2n people. Given the array costs where costs[i] = [aCosti, bCosti], the cost of flying the ith person to city a is
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摘要：Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*' where: '?' Matches any single character.
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摘要：There are n kids with candies. You are given an integer array candies, where each candies[i] represents the number of candies the ith kid has, and an
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