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Lisanaaa

就职于某SEA公司，兴趣是程序算法，系统设计和业务研究。

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结构化算法刷题训练指南

作者介绍 🀄️： @Lisanaaa：开源万星算法项目作者，就职于某 SEA 公司，兴趣是算法，系统设计和业务研究...

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Lisanaaa in 结构化算法刷题训练指南

611. Valid Triangle Number

611. Valid Triangle Number <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/valid-triangle-number/description/ 内容描述 Given an array consists of non-negative integers, your task is to count the nu...

Lisanaaa in 结构化算法刷题训练指南

610. Triangle Judgement

610. Triangle Judgement <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/triangle-judgement/ 内容描述 SQL Schema A pupil Tim gets homework to identify whether three line segments could possibly form a...

Lisanaaa in 结构化算法刷题训练指南

609. Find Duplicate File in System

609. Find Duplicate File in System <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/find-duplicate-file-in-system/ 内容描述 Given a list of directory info including directory path, and all the files...

Lisanaaa in 结构化算法刷题训练指南

1277. Count Square Submatrices with All Ones

1277. Count Square Submatrices with All Ones <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/count-square-submatrices-with-all-ones/ 内容描述 Given a m * n matrix of ones and zeros, return how many...

Lisanaaa in 结构化算法刷题训练指南

1267. Count Servers that Communicate

1267. Count Servers that Communicate <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/count-servers-that-communicate/ 内容描述 You are given a map of a server center, represented as a m * n integer ...

Lisanaaa in 结构化算法刷题训练指南

1286. Iterator for Combination

1286. Iterator for Combination <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/iterator-for-combination/ 内容描述 Design an Iterator class, which has: A constructor that takes a string characters ...

Lisanaaa in 结构化算法刷题训练指南

1323. Maximum 69 Number

1323. Maximum 69 Number <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/maximum-69-number/ 内容描述 Given a positive integer num consisting only of digits 6 and 9. Return the maximum number you can g...

Lisanaaa in 结构化算法刷题训练指南

1332. Remove Palindromic Subsequences

1332. Remove Palindromic Subsequences <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/remove-palindromic-subsequences/ 内容描述 Given a string s consisting only of letters 'a' and 'b'. In a single ste...

Lisanaaa in 结构化算法刷题训练指南

709. To Lower Case

709. To Lower Case <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/to-lower-case/ 内容描述 Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. ...

Lisanaaa in 结构化算法刷题训练指南

707. Design Linked List

707. Design Linked List <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/design-linked-list/description/ 内容描述 Design your implementation of the linked list. You can choose to use the singly linked ...

Lisanaaa in 结构化算法刷题训练指南

703. Kth Largest Element in a Stream

703. Kth Largest Element in a Stream <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/kth-largest-element-in-a-stream/ 内容描述 Design a class to find the kth largest element in a stream. Note that it ...

Lisanaaa in 结构化算法刷题训练指南

1220. Count Vowels Permutation

1220. Count Vowels Permutation <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/count-vowels-permutation/ 内容描述 Given an integer n, your task is to count how many strings of length n can be formed und...

Lisanaaa in 结构化算法刷题训练指南

400. Nth Digit

400. Nth Digit <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/nth-digit/ 内容描述 Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ... Note: n is positive an...

Lisanaaa in 结构化算法刷题训练指南

721. Accounts Merge

721. Accounts Merge <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/accounts-merge 内容描述 Given a list accounts, each element accounts[i] is a list of strings, where the first element accounts[i]...

Lisanaaa in 结构化算法刷题训练指南

1317. Convert Integer to the Sum of Two No-Zero Integers

1317. Convert Integer to the Sum of Two No-Zero Integers <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/convert-integer-to-the-sum-of-two-no-zero-integers/ 内容描述 Given an integer n. No-Zero intege...

Lisanaaa in 结构化算法刷题训练指南

517. Super Washing Machines

517. Super Washing Machines <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/super-washing-machines/ 内容描述 You have n super washing machines on a line. Initially, each washing machine has some dresses...

Lisanaaa in 结构化算法刷题训练指南

1312. Minimum Insertion Steps to Make a String Palindrome

1312. Minimum Insertion Steps to Make a String Palindrome <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/minimum-insertion-steps-to-make-a-string-palindrome/ 内容描述 Given a string s. In one step you ...

Lisanaaa in 结构化算法刷题训练指南

1313. Decompress Run-Length Encoded List

1313. Decompress Run-Length Encoded List <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/decompress-run-length-encoded-list/ 内容描述 We are given a list nums of integers representing a list compresse...

Lisanaaa in 结构化算法刷题训练指南

1314. Matrix Block Sum

1314. Matrix Block Sum <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/matrix-block-sum/ 内容描述 Given a m * n matrix mat and an integer K, return a matrix answer where each answer[i][j] is the su...

Lisanaaa in 结构化算法刷题训练指南

1315. Sum of Nodes with Even-Valued Grandparent

1315. Sum of Nodes with Even-Valued Grandparent <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/sum-of-nodes-with-even-valued-grandparent/ 内容描述 Given a binary tree, return the sum of values of ...

Lisanaaa in 结构化算法刷题训练指南

1316. Distinct Echo Substrings

1316. Distinct Echo Substrings <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/distinct-echo-substrings/ 内容描述 Return the number of distinct non-empty substrings of text that can be written as the co...

Lisanaaa in 结构化算法刷题训练指南

606. Construct String from Binary Tree

606. Construct String from Binary Tree <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/construct-string-from-binary-tree/description/ 内容描述 You need to construct a string consists of parenthesis an...

Lisanaaa in 结构化算法刷题训练指南

877. Stone Game

877. Stone Game <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/stone-game/ 内容描述 Alex and Lee play a game with piles of stones. There are an even number of piles arranged in a row, and each pi...

Lisanaaa in 结构化算法刷题训练指南

900. RLE Iterator

900. RLE Iterator <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/rle-iterator/description/ 内容描述 Write an iterator that iterates through a run-length encoded sequence. The iterator is initial...

Lisanaaa in 结构化算法刷题训练指南

896. Monotonic Array

896. Monotonic Array <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/monotonic-array 内容描述 An array is monotonic if it is either monotone increasing or monotone decreasing. An array A is monotone ...

Lisanaaa in 结构化算法刷题训练指南

891. Sum of Subsequence Widths

891. Sum of Subsequence Widths <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/sum-of-subsequence-widths/description/ 内容描述 Given an array of integers A, consider all non-empty subsequences of A. F...

Lisanaaa in 结构化算法刷题训练指南

890. Find and Replace Pattern

890. Find and Replace Pattern <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/find-and-replace-pattern/description/ 内容描述 You have a list of words and a pattern, and you want to know which words...

Lisanaaa in 结构化算法刷题训练指南

1224. Maximum Equal Frequency

1224. Maximum Equal Frequency <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/maximum-equal-frequency/ 内容描述 Given an array nums of positive integers, return the longest possible length of an array p...

Lisanaaa in 结构化算法刷题训练指南

1223. Dice Roll Simulation

1223. Dice Roll Simulation <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/dice-roll-simulation/ 内容描述 A die simulator generates a random number from 1 to 6 for each roll. You introduced a const...

Lisanaaa in 结构化算法刷题训练指南

1222. Queens That Can Attack the King

1222. Queens That Can Attack the King <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/queens-that-can-attack-the-king/ 内容描述 On an 8x8 chessboard, there can be multiple Black Queens and one Whit...

Lisanaaa in 结构化算法刷题训练指南

1221. Split a String in Balanced Strings

1221. Split a String in Balanced Strings <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/split-a-string-in-balanced-strings/ 内容描述 Balanced strings are those who have equal quantity of 'L' and 'R' ...

Lisanaaa in 结构化算法刷题训练指南

774. Minimize Max Distance to Gas Station

774. Minimize Max Distance to Gas Station <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/minimize-max-distance-to-gas-station/description/ 内容描述 On a horizontal number line, we have gas stations at ...

Lisanaaa in 结构化算法刷题训练指南

771. Jewels and Stones

771. Jewels and Stones <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/jewels-and-stones/ 内容描述 You're given strings J representing the types of stones that are jewels, and S representing the stone...

Lisanaaa in 结构化算法刷题训练指南

767. Reorganize String

767. Reorganize String <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/reorganize-string/description/ 内容描述 Given a string S, check if the letters can be rearranged so that two characters that a...

Lisanaaa in 结构化算法刷题训练指南

1183. Maximum Number of Ones

1183. Maximum Number of Ones <font color=Hard>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/maximum-number-of-ones/ 内容描述 Consider a matrix M with dimensions width * height, such that every cell has value 0 or 1, ...

Lisanaaa in 结构化算法刷题训练指南

1182. Shortest Distance to Target Color

1182. Shortest Distance to Target Color <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/shortest-distance-to-target-color/ 内容描述 You are given an array colors, in which there are three colors: 1...

Lisanaaa in 结构化算法刷题训练指南

1181. Before and After Puzzle

1181. Before and After Puzzle <font color=Orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/before-and-after-puzzle/ 内容描述 Given a list of phrases, generate a list of Before and After puzzles. A phrase is a ...

Lisanaaa in 结构化算法刷题训练指南

1180. Count Substrings with Only One Distinct Letter

1180. Count Substrings with Only One Distinct Letter <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/count-substrings-with-only-one-distinct-letter/ 内容描述 Given a string S, return the number of sub...

Lisanaaa in 结构化算法刷题训练指南

766. Toeplitz Matrix

766. Toeplitz Matrix <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/toeplitz-matrix/description/ 内容描述 A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. N...

Lisanaaa in 结构化算法刷题训练指南

765. Couples Holding Hands

765. Couples Holding Hands <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/couples-holding-hands/ 内容描述 N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum...

Lisanaaa in 结构化算法刷题训练指南

763. Partition Labels

763. Partition Labels <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/partition-labels/description/ 内容描述 A string S of lowercase letters is given. We want to partition this string into as many...

Lisanaaa in 结构化算法刷题训练指南

754. Reach a Number

754. Reach a Number <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/reach-a-number/ 内容描述 You are standing at position 0 on an infinite number line. There is a goal at position target. On each mov...

Lisanaaa in 结构化算法刷题训练指南

746. Min Cost Climbing Stairs

746. Min Cost Climbing Stairs <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/min-cost-climbing-stairs/ 内容描述 On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). ...

Lisanaaa in 结构化算法刷题训练指南

1163. Last Substring in Lexicographical Order

1163. Last Substring in Lexicographical Order <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/last-substring-in-lexicographical-order/ 内容描述 Given a string s, return the last substring of s in lexico...

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1162. As Far from Land as Possible

1162. As Far from Land as Possible <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/as-far-from-land-as-possible/ 内容描述 Given an N x N grid containing only values 0 and 1, where 0 represents wate...

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1161. Maximum Level Sum of a Binary Tree

1161. Maximum Level Sum of a Binary Tree <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/maximum-level-sum-of-a-binary-tree/ 内容描述 Given the root of a binary tree, the level of its root is 1, th...

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1160. Find Words That Can Be Formed by Characters

1160. Find Words That Can Be Formed by Characters <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/find-words-that-can-be-formed-by-characters/ 内容描述 You are given an array of strings words and a st...

Lisanaaa in 结构化算法刷题训练指南

561. Array Partition I

561. Array Partition I <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/array-partition-i/description/ 内容描述 Given an array of 2n integers, your task is to group these integers into n pairs of inte...

Lisanaaa in 结构化算法刷题训练指南

653. Two Sum IV - Input is a BST

653. Two Sum IV - Input is a BST <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/two-sum-iv-input-is-a-bst/description/ 内容描述 Given a Binary Search Tree and a target number, return true if there ex...

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575. Distribute Candies

575. Distribute Candies <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/distribute-candies/ 内容描述 Given an integer array with even length, where different numbers in this array represent different ...

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499. The Maze III

499. The Maze III <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/the-maze-iii/ 内容描述 There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up (u), do...

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1104. Path In Zigzag Labelled Binary Tree

1104. Path In Zigzag Labelled Binary Tree <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/path-in-zigzag-labelled-binary-tree/ 内容描述 In an infinite binary tree where every node has two children,...

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1103. Distribute Candies to People

1103. Distribute Candies to People <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/distribute-candies-to-people/ 内容描述 We distribute some number of candies, to a row of n = num_people people in the...

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738. Monotone Increasing Digits

738. Monotone Increasing Digits <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/monotone-increasing-digits/ 内容描述 Given a non-negative integer N, find the largest number that is less than or equ...

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737. Sentence Similarity II

737. Sentence Similarity II <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/sentence-similarity-ii 内容描述 Given two sentences words1, words2 (each represented as an array of strings), and a list ...

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735. Asteroid Collision

735. Asteroid Collision <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/asteroid-collision/ 内容描述 We are given an array asteroids of integers representing asteroids in a row. For each asteroid,...

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733. Flood Fill

733. Flood Fill <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/flood-fill/description/ 内容描述 An image is represented by a 2-D array of integers, each integer representing the pixel value of the im...

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730. Count Different Palindromic Subsequences

730. Count Different Palindromic Subsequences <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/count-different-palindromic-subsequences/ 内容描述 Given a string S, find the number of different non-empty ...

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1102. Path With Maximum Minimum Value

1102. Path With Maximum Minimum Value <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/path-with-maximum-minimum-value/ 内容描述 Given a matrix of integers A with R rows and C columns, find the maxi...

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1101. The Earliest Moment When Everyone Become Friends

1101. The Earliest Moment When Everyone Become Friends <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/the-earliest-moment-when-everyone-become-friends/ 内容描述 In a social group, there are N peop...

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1100. Find K-Length Substrings With No Repeated Characters

1100. Find K-Length Substrings With No Repeated Characters <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/find-k-length-substrings-with-no-repeated-characters/ 内容描述 Given a string S, return th...

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1099. Two Sum Less Than K

1099. Two Sum Less Than K <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/two-sum-less-than-k/ 内容描述 Given an array A of integers and integer K, return the maximum S such that there exists i < j...

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729. My Calendar I

729. My Calendar I <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/my-calendar-i/ 内容描述 Implement a MyCalendar class to store your events. A new event can be added if adding the event will not c...

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878. Nth Magical Number

878. Nth Magical Number <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/nth-magical-number/description/ 内容描述 A positive integer is magical if it is divisible by either A or B. Return the N-th magic...

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347. Top K Frequent Elements

347. Top K Frequent Elements <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/top-k-frequent-elements/description/ 内容描述 Given a non-empty array of integers, return the k most frequent elements. ...

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728. Self Dividing Numbers

728. Self Dividing Numbers <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/self-dividing-numbers/ 内容描述 A self-dividing number is a number that is divisible by every digit it contains. For example...

Lisanaaa in 结构化算法刷题训练指南

346. Moving Average from Data Stream

346. Moving Average from Data Stream <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/moving-average-from-data-stream/ 内容描述 Given a stream of integers and a window size, calculate the moving averag...

Lisanaaa in 结构化算法刷题训练指南

800. Similar RGB Color

800. Similar RGB Color <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/similar-rgb-color/description/ 内容描述 In the following, every capital letter represents some hexadecimal digit from 0 to f. T...

Lisanaaa in 结构化算法刷题训练指南

1096. Brace Expansion II

1096. Brace Expansion II <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/brace-expansion-ii/ 内容描述 Under a grammar given below, strings can represent a set of lowercase words. Let's use R(expr) to d...

Lisanaaa in 结构化算法刷题训练指南

1095. Find in Mountain Array

1095. Find in Mountain Array <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/find-in-mountain-array/ 内容描述 (This problem is an interactive problem.) You may recall that an array A is a mountain arra...

Lisanaaa in 结构化算法刷题训练指南

1094. Car Pooling

1094. Car Pooling <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/car-pooling/ 内容描述 You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only...

Lisanaaa in 结构化算法刷题训练指南

1093. Statistics from a Large Sample

1093. Statistics from a Large Sample <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/statistics-from-a-large-sample/ 内容描述 We sampled integers between 0 and 255, and stored the results in an arr...

Lisanaaa in 结构化算法刷题训练指南

808. Soup Servings

808. Soup Servings <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/soup-servings/ 内容描述 There are two types of soup: type A and type B. Initially we have N ml of each type of soup. There are fou...

Lisanaaa in 结构化算法刷题训练指南

829. Consecutive Numbers Sum

829. Consecutive Numbers Sum <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/consecutive-numbers-sum/ 内容描述 Given a positive integer N, how many ways can we write it as a sum of consecutive positive...

Lisanaaa in 结构化算法刷题训练指南

960. Delete Columns to Make Sorted III

960. Delete Columns to Make Sorted III <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/delete-columns-to-make-sorted-iii/ 内容描述 We are given an array A of N lowercase letter strings, all of the same ...

Lisanaaa in 结构化算法刷题训练指南

959. Regions Cut By Slashes

959. Regions Cut By Slashes <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/regions-cut-by-slashes/ 内容描述 In a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, \, or blan...

Lisanaaa in 结构化算法刷题训练指南

958. Check Completeness of a Binary Tree

958. Check Completeness of a Binary Tree <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/check-completeness-of-a-binary-tree/ 内容描述 Given a binary tree, determine if it is a complete binary tree...

Lisanaaa in 结构化算法刷题训练指南

957. Prison Cells After N Days

957. Prison Cells After N Days <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/prison-cells-after-n-days/ 内容描述 There are 8 prison cells in a row, and each cell is either occupied or vacant. Ea...

Lisanaaa in 结构化算法刷题训练指南

956. Tallest Billboard

956. Tallest Billboard <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/tallest-billboard/ 内容描述 You are installing a billboard and want it to have the largest height. The billboard will have two ste...

Lisanaaa in 结构化算法刷题训练指南

955. Delete Columns to Make Sorted II

955. Delete Columns to Make Sorted II <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/delete-columns-to-make-sorted-ii/ 内容描述 We are given an array A of N lowercase letter strings, all of the sa...

Lisanaaa in 结构化算法刷题训练指南

954. Array of Doubled Pairs

954. Array of Doubled Pairs <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/array-of-doubled-pairs/ 内容描述 Given an array of integers A with even length, return true if and only if it is possible...

Lisanaaa in 结构化算法刷题训练指南

953. Verifying an Alien Dictionary

953. Verifying an Alien Dictionary <font color=green>难度: Easy</font> 刷题内容原题连接 https://leetcode.com/problems/verifying-an-alien-dictionary/ 内容描述 In an alien language, surprisingly they also use english lowercase letters, b...

Lisanaaa in 结构化算法刷题训练指南

952. Largest Component Size by Common Factor

952. Largest Component Size by Common Factor <font color=red>难度: Hard</font> 刷题内容原题连接 https://leetcode.com/problems/largest-component-size-by-common-factor/ 内容描述 Given a non-empty array of unique positive integers A, cons...

Lisanaaa in 结构化算法刷题训练指南

951. Flip Equivalent Binary Trees

951. Flip Equivalent Binary Trees <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/flip-equivalent-binary-trees/ 内容描述 For a binary tree T, we can define a flip operation as follows: choose any n...

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950. Reveal Cards In Increasing Order

950. Reveal Cards In Increasing Order <font color=orange>难度: Medium</font> 刷题内容原题连接 https://leetcode.com/problems/reveal-cards-in-increasing-order/ 内容描述 In a deck of cards, every card has a unique integer. You can order ...

Lisanaaa in 结构化算法刷题训练指南

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