Канал: Ren Zhang

Channel Intro and Update

Channel Intro and Update

Leetcode 70 Climbing Stairs

Leetcode 70 Climbing Stairs

Leetcode 309 Best Time to Buy and Sell Stock with Cooldown

Leetcode 309 Best Time to Buy and Sell Stock with Cooldown

Leetcode 105/106 Construct Binary Tree from Inorder and Postorder(Preorder) Traversal

Leetcode 105/106 Construct Binary Tree from Inorder and Postorder(Preorder) Traversal

Leetcode 258 Add Digits

Leetcode 258 Add Digits

Leetcode 153/154 Find Minimum in Rotated Sorted Array I/II

Leetcode 153/154 Find Minimum in Rotated Sorted Array I/II

Leetcode 797 All Paths From Source to Target

Leetcode 797 All Paths From Source to Target

Leetcode 103 Binary Tree Zigzag Level Order Traversal

Leetcode 103 Binary Tree Zigzag Level Order Traversal

Leetcode 79 Word Search

Leetcode 79 Word Search

Leetcode 203 Remove Linked List Elements

Leetcode 203 Remove Linked List Elements

Leetcode 347 Top K Frequent Elements

Leetcode 347 Top K Frequent Elements

Leetcode 50 Pow(x, n)

Leetcode 50 Pow(x, n)

Leetcode 151 Reverse Words in a String

Leetcode 151 Reverse Words in a String

Leetcode 1344 Angle Between Hands of a Clock

Leetcode 1344 Angle Between Hands of a Clock

Leetcode 100 Same Tree

Leetcode 100 Same Tree

Leetcode 190 Reverse Bits

Leetcode 190 Reverse Bits

Leetcode 430 Flatten a Multilevel Doubly Linked List

Leetcode 430 Flatten a Multilevel Doubly Linked List

Leetcode 662 Maximum Width of Binary Tree

Leetcode 662 Maximum Width of Binary Tree

Leetcode 15 3Sum

Leetcode 15 3Sum

Leetcode 463 Island Perimeter

Leetcode 463 Island Perimeter

Leetcode 1026 Maximum Difference Between Node and Ancestor

Leetcode 1026 Maximum Difference Between Node and Ancestor

Leetcode 66 Plus One

Leetcode 66 Plus One

Leetcode 1203 Sort Items by Groups Respecting Dependencies

Leetcode 1203 Sort Items by Groups Respecting Dependencies

Leetcode 264 Ugly Number II

Leetcode 264 Ugly Number II

Leetcode 957 Prison Cells After N Days

Leetcode 957 Prison Cells After N Days

Leetcode 107 Binary Tree Level Order Traversal II

Leetcode 107 Binary Tree Level Order Traversal II

Leetcode 329 Longest Increasing Path in a Matrix

Leetcode 329 Longest Increasing Path in a Matrix

Leetcode 441 Arranging Coins

Leetcode 441 Arranging Coins

Leetcode 444 Sequence Reconstruction

Leetcode 444 Sequence Reconstruction

Leetcode 210 Course Schedule II

Leetcode 210 Course Schedule II

Leetcode 62 Unique Paths

Leetcode 62 Unique Paths

Leetcode 332 Reconstruct Itinerary

Leetcode 332 Reconstruct Itinerary

Leetcode 279 Perfect Squares

Leetcode 279 Perfect Squares

Leetcode 218 The Skyline Problem

Leetcode 218 The Skyline Problem

Leetcode 129 Sum Root to Leaf Numbers

Leetcode 129 Sum Root to Leaf Numbers

Leetcode 850 Rectangle Area II

Leetcode 850 Rectangle Area II

Leetcode 287 Find the Duplicate Number

Leetcode 287 Find the Duplicate Number

Leetcode 1229 Meeting Scheduler

Leetcode 1229 Meeting Scheduler

Leetcode 96 Unique Binary Search Trees

Leetcode 96 Unique Binary Search Trees

Leetcode 1272 Remove Interval

Leetcode 1272 Remove Interval

Leetcode 222 Count Complete Tree Nodes

Leetcode 222 Count Complete Tree Nodes

Leetcode 1288 Remove Covered Intervals

Leetcode 1288 Remove Covered Intervals

Leetcode 174 Dungeon Game

Leetcode 174 Dungeon Game

Leetcode 212 Word Search II

Leetcode 212 Word Search II

Leetcode 336 Palindrome Pairs

Leetcode 336 Palindrome Pairs

Leetcode 60 Permutation Sequence

Leetcode 60 Permutation Sequence

Leetcode 677 Map Sum Pairs

Leetcode 677 Map Sum Pairs

Leetcode 1044 Longest Duplicate Substring

Leetcode 1044 Longest Duplicate Substring

Leetcode 275 H-Index II

Leetcode 275 H-Index II

Leetcode 648 Replace Words

Leetcode 648 Replace Words

Leetcode 720 Longest Word in Dictionary

Leetcode 720 Longest Word in Dictionary

Leetcode 130 Surrounded Regions

Leetcode 130 Surrounded Regions

Leetcode 1065 Index Pairs of a String

Leetcode 1065 Index Pairs of a String

Leetcode 468 Validate IP Address

Leetcode 468 Validate IP Address

Trie

Trie

Leetcode 700 Search in a Binary Search Tree

Leetcode 700 Search in a Binary Search Tree

Leetcode 787 Cheapest Flights Within K Stops

Leetcode 787 Cheapest Flights Within K Stops

Leetcode 1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows

Leetcode 1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows

Leetcode 368 Largest Divisible Subset

Leetcode 368 Largest Divisible Subset

Leetcode 502 IPO

Leetcode 502 IPO

Leetcode 380 Insert Delete GetRandom O(1)

Leetcode 380 Insert Delete GetRandom O(1)

Leetcode 313 Super Ugly Number

Leetcode 313 Super Ugly Number

Leetcode 75 Sort Colors

Leetcode 75 Sort Colors

Leetcode 252/253 Meeting Rooms I/II

Leetcode 252/253 Meeting Rooms I/II

Leetcode 35 Search Insert Position

Leetcode 35 Search Insert Position

Leetcode 703 Kth Largest Element in a Stream

Leetcode 703 Kth Largest Element in a Stream

Leetcode 392 Is Subsequence

Leetcode 392 Is Subsequence

Priority Queue

Priority Queue

Leetcode 231 Power of Two

Leetcode 231 Power of Two

Leetcode 518 Coin Change II

Leetcode 518 Coin Change II

Leetcode 684/685 Redundant Connection I/II

Leetcode 684/685 Redundant Connection I/II

Leetcode 406 Queue Reconstruction by Height

Leetcode 406 Queue Reconstruction by Height

Leetcode 924 Minimize Malware Spread

Leetcode 924 Minimize Malware Spread

Leetcode 548 Split Array with Equal Sum

Leetcode 548 Split Array with Equal Sum

Leetcode 1013 Partition Array Into Three Parts With Equal Sum

Leetcode 1013 Partition Array Into Three Parts With Equal Sum

Leetcode 778 Swim in Rising Water

Leetcode 778 Swim in Rising Water

Leetcode 344 Reverse String

Leetcode 344 Reverse String

Leetcode 305 Number of Islands II

Leetcode 305 Number of Islands II

Leetcode 1029 Two City Scheduling

Leetcode 1029 Two City Scheduling

Leetcode 128 Longest Consecutive Sequence

Leetcode 128 Longest Consecutive Sequence

Leetcode 237 Delete Node in a Linked List

Leetcode 237 Delete Node in a Linked List

Union Find

Union Find

Leetcode 226 Invert Binary Tree

Leetcode 226 Invert Binary Tree

Leetcode 72 Edit Distance

Leetcode 72 Edit Distance

Leetcode 25 Reverse Nodes in k-Group

Leetcode 25 Reverse Nodes in k-Group

Leetcode 24 Swap Nodes in Pairs

Leetcode 24 Swap Nodes in Pairs

Leetcode 138 Copy List with Random Pointer

Leetcode 138 Copy List with Random Pointer

Leetcode 207 Course Schedule

Leetcode 207 Course Schedule

Leetcode 141/142 Linked List Cycle I/II

Leetcode 141/142 Linked List Cycle I/II

Leetcode 82 Remove Duplicates from Sorted List II

Leetcode 82 Remove Duplicates from Sorted List II

Leetcode 83 Remove Duplicates from Sorted List

Leetcode 83 Remove Duplicates from Sorted List

Leetcode 886 Possible Bipartition

Leetcode 886 Possible Bipartition

Leetcode 92 Reverse Linked List II

Leetcode 92 Reverse Linked List II

Leetcode 206 Reverse Linked List

Leetcode 206 Reverse Linked List

Linked List

Linked List

Leetcode 1035 Uncrossed Lines

Leetcode 1035 Uncrossed Lines

Leetcode 4 Median of Two Sorted Arrays

Leetcode 4 Median of Two Sorted Arrays

Leetcode 410 Split Array Largest Sum

Leetcode 410 Split Array Largest Sum

Leetcode 658 Find K Closest Elements

Leetcode 658 Find K Closest Elements

Leetcode 74 Search a 2D Matrix

Leetcode 74 Search a 2D Matrix

Leetcode 451 Sort Characters By Frequency

Leetcode 451 Sort Characters By Frequency

Leetcode 528 Random Pick with Weight

Leetcode 528 Random Pick with Weight

Leetcode 1277 Count Square Submatrices with All Ones

Leetcode 1277 Count Square Submatrices with All Ones

Leetcode 34 Find First and Last Position of Element in Sorted Array

Leetcode 34 Find First and Last Position of Element in Sorted Array

Leetcode 230 Kth Smallest Element in a BST

Leetcode 230 Kth Smallest Element in a BST

Leetcode 852/162 Peak Index in a Mountain Array/Find Peak Element

Leetcode 852/162 Peak Index in a Mountain Array/Find Peak Element

Leetcode 901 Online Stock Span

Leetcode 901 Online Stock Span

Leetcode 825 Friends Of Appropriate Ages

Leetcode 825 Friends Of Appropriate Ages

Binary Search

Binary Search

Leetcode 371 Sum of Two Integers

Leetcode 371 Sum of Two Integers

Leetcode 784/78 Letter Case Permutation/Subsets

Leetcode 784/78 Letter Case Permutation/Subsets

Leetcode 328 Odd Even Linked List

Leetcode 328 Odd Even Linked List

Leetcode 260 Single Number III

Leetcode 260 Single Number III

Leetcode 918 Maximum Sum Circular Subarray

Leetcode 918 Maximum Sum Circular Subarray

Leetcode 137 Single Number II

Leetcode 137 Single Number II

Leetcode 208 Implement Trie (Prefix Tree)

Leetcode 208 Implement Trie (Prefix Tree)

Leetcode 461/477 (Total) Hamming Distance

Leetcode 461/477 (Total) Hamming Distance

Leetcode 402 Remove K Digits

Leetcode 402 Remove K Digits

Leetcode 191/338 Number of 1 Bits / Counting Bits

Leetcode 191/338 Number of 1 Bits / Counting Bits

Leetcode 540 Single Element in a Sorted Array

Leetcode 540 Single Element in a Sorted Array

Bit Manipulation

Bit Manipulation

Leetcode 733 Flood Fill

Leetcode 733 Flood Fill

Leetcode 567 Permutation in String

Leetcode 567 Permutation in String

Leetcode 997 Find the Town Judge

Leetcode 997 Find the Town Judge

Leetcode 367 Valid Perfect Square

Leetcode 367 Valid Perfect Square

Leetcode 42 Trapping Rain Water

Leetcode 42 Trapping Rain Water

Leetcode 1232 Check If It Is a Straight Line

Leetcode 1232 Check If It Is a Straight Line

Leetcode 993 Cousins in Binary Tree

Leetcode 993 Cousins in Binary Tree

Leetcode 689 Maximum Sum of 3 Non-Overlapping Subarrays

Leetcode 689 Maximum Sum of 3 Non-Overlapping Subarrays

Leetcode 169 Majority Element

Leetcode 169 Majority Element

Leetcode 273 Integer to English Words

Leetcode 273 Integer to English Words

Leetcode 387 First Unique Character in a String

Leetcode 387 First Unique Character in a String

Leetcode 896 Monotonic Array

Leetcode 896 Monotonic Array

Leetcode 476 Number Complement

Leetcode 476 Number Complement

Leetcode 65 Valid Number

Leetcode 65 Valid Number

Leetcode 383 Ransom Note

Leetcode 383 Ransom Note

Leetcode 269 Alien Dictionary

Leetcode 269 Alien Dictionary

Leetcode 771 Jewels and Stones

Leetcode 771 Jewels and Stones

Leetcode 670 Maximum Swap

Leetcode 670 Maximum Swap

Leetcode 249 Group Shifted Strings

Leetcode 249 Group Shifted Strings

Leetcode 1430 Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

Leetcode 1430 Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

Leetcode 938 Range Sum of BST

Leetcode 938 Range Sum of BST

Leetcode 124 Binary Tree Maximum Path Sum

Leetcode 124 Binary Tree Maximum Path Sum

Leetcode 157/158 Read N Characters Given Read 4 I/II

Leetcode 157/158 Read N Characters Given Read 4 I/II

Leetcode 1429 First Unique Number

Leetcode 1429 First Unique Number

Leetcode 221 Maximal Square

Leetcode 221 Maximal Square

Leetcode 140 Word Break II

Leetcode 140 Word Break II

Leetcode 1143 Longest Common Subsequence

Leetcode 1143 Longest Common Subsequence

Leetcode 76 Minimum Window Substring

Leetcode 76 Minimum Window Substring

Leetcode 55 Jump Game

Leetcode 55 Jump Game

Leetcode 282 Expression Add Operators

Leetcode 282 Expression Add Operators

Leetcode 21/23 Merge Two/K Sorted Lists

Leetcode 21/23 Merge Two/K Sorted Lists

Leetcode 201 Bitwise AND of Numbers Range

Leetcode 201 Bitwise AND of Numbers Range

Leetcode 314/987 Binary Tree Vertical Order Traversal

Leetcode 314/987 Binary Tree Vertical Order Traversal

Leetcode 1197 Minimum Knight Moves

Leetcode 1197 Minimum Knight Moves

Leetcode 235/236 Lowest Common Ancestor of a Binary (Search) Tree

Leetcode 235/236 Lowest Common Ancestor of a Binary (Search) Tree

Leetcode 1428 Leftmost Column with at Least a One

Leetcode 1428 Leftmost Column with at Least a One

Leetcode 865/1123 Lowest Common Ancestor of Deepest Leaves

Leetcode 865/1123 Lowest Common Ancestor of Deepest Leaves

Leetcode 1008 Construct Binary Search Tree from Preorder Traversal

Leetcode 1008 Construct Binary Search Tree from Preorder Traversal

Leetcode 301 Remove Invalid Parentheses

Leetcode 301 Remove Invalid Parentheses

Leetcode 20 Valid Parentheses

Leetcode 20 Valid Parentheses

Leetcode 64 Minimum Path Sum

Leetcode 64 Minimum Path Sum

Leetcode 340 Longest Substring with At Most K Distinct Characters

Leetcode 340 Longest Substring with At Most K Distinct Characters

Leetcode 200 Number of Islands

Leetcode 200 Number of Islands

Leetcode 297 Serialize and Deserialize Binary Tree

Leetcode 297 Serialize and Deserialize Binary Tree

Leetcode 678 Valid Parenthesis String

Leetcode 678 Valid Parenthesis String

Leetcode 29 Divide Two Integers

Leetcode 29 Divide Two Integers

Leetcode 133 Clone Graph

Leetcode 133 Clone Graph

Leetcode 785 Is Graph Bipartite

Leetcode 785 Is Graph Bipartite

Leetcode 1427 Perform String Shifts

Leetcode 1427 Perform String Shifts

Leetcode 498 Diagonal Traverse

Leetcode 498 Diagonal Traverse

Leetcode 525 Contiguous Array

Leetcode 525 Contiguous Array

Leetcode 523 Continuous Subarray Sum

Leetcode 523 Continuous Subarray Sum

Leetcode 1046 Last Stone Weight

Leetcode 1046 Last Stone Weight

Leetcode 146 LRU Cache

Leetcode 146 LRU Cache

Leetcode 31 Next Permutation

Leetcode 31 Next Permutation

Leetcode 155 Min Stack

Leetcode 155 Min Stack

Leetcode 33 Search in Rotated Sorted Array

Leetcode 33 Search in Rotated Sorted Array

Leetcode 844 Backspace String Compare

Leetcode 844 Backspace String Compare

Leetcode 211 Add and Search Word

Leetcode 211 Add and Search Word

Leetcode 876 Middle of the Linked List

Leetcode 876 Middle of the Linked List

Leetcode 56 Merge Intervals

Leetcode 56 Merge Intervals

Leetcode 1426 Counting Elements

Leetcode 1426 Counting Elements

Leetcode 49 Group Anagrams

Leetcode 49 Group Anagrams

Leetcode 139 Word Break

Leetcode 139 Word Break

Leetcode 438 Find All Anagrams in a String

Leetcode 438 Find All Anagrams in a String

Leetcode 122 Best Time to Buy and Sell Stock II

Leetcode 122 Best Time to Buy and Sell Stock II

Leetcode 560 Subarray Sum Equals K

Leetcode 560 Subarray Sum Equals K

Leetcode 283 Move Zeros

Leetcode 283 Move Zeros

Leetcode 721 Accounts Merge

Leetcode 721 Accounts Merge

Leetcode 53 Maximum Subarray

Leetcode 53 Maximum Subarray

Leetcode 767 Reorganize String

Leetcode 767 Reorganize String

Leetcode 202 Happy Number

Leetcode 202 Happy Number

Leetcode 621 Task Scheduler

Leetcode 621 Task Scheduler

Leetcode 136 Single Number

Leetcode 136 Single Number

Leetcode 636 Exclusive Time of Functions

Leetcode 636 Exclusive Time of Functions

Leetcode 199 Binary Tree Right Side View

Leetcode 199 Binary Tree Right Side View

Leetcode 286 Walls and Gates

Leetcode 286 Walls and Gates

Leetcode 215 Kth Largest Element in an Array

Leetcode 215 Kth Largest Element in an Array

Leetcode 398 Random Pick Index

Leetcode 398 Random Pick Index